'Resampling' images

I'm using Photoshop Starter Edition 3.0 on Windows XP and I want to resize images (or 'resample') so that the image takes up less bandwidth when I upload it to a website.
But I can't find any drop-down menus or links in the programme to resize. How do I change the image so that it is 800x600, without cropping any of the image?

You can use the email facility to do this. From Prefs you can setit to just save attachments to a folder and then "email" the images, selecting the size you want.

Similar Messages

Resized & resampled image problems in Elements 5.0 on xp

I'm having trouble with resize & resample images (trying to make them much smaller) so I can place multiple images onto a PDFpage at predetermined individual specific physical sizes thereby avoiding resizing the images within the PDF document, of which I understand is a NoNo for getting it commercially printed. When I resize & resample an image and set the physical dimensions of the image it prints as a test print to the size I have set/want. The problem arises after I have saved the image & then try to insert it into my document. The saved image file when inserted is still or very close to the same physical size as before I resized & resampled it. - So what am I not doing or doing wrong. I have checked the file size in Windows Explorer and the actual file size is only a fraction of what the original is. The image has been reduced from 3200KB to 109KB, confirming I have at least reduced something within the file, just not what I wanted to. When I reopen the file in Elements and print it it is still the size I want, so why isn't it the right size when I insert it into a document. I have read the help files and don't understand what I am doing wrong, Please help.

Hi,
I suspect that the resolution of the file is getting changed instead of dimensions. So, the file size is decreasing but the dimensions are remaining the same.
Please confirm that you are resizing the image as follows:
1. Open the image
2. Go to Image -> Resize -> Image Size
3. Select the option Resample Image
4. Now provide the new dimensions in Width & Height
5. Click OK and save the image
Now try importing on the PDF page.
Thanks,
Tarun

CS4 Resample Image Check Box - Turning Off

CS4 > Image > Image Size > Resample Image checkbox
Is there a way to alter the program preferences to always show that box as unchecked? I went to Edit > Preferences and could not find a method.

Simply load an image,bring up the Image Size dialog box,uncheck the Resample Image box,and click OK. It should stay that way.

PDF Export - How do I resample images for 25% print?

Using OSX 10.6 and CS3 504.
I've built 6x large format pages at 1885mm x 600mm that will be printed on an HP5500. Content includes text, images, and objects with fills/strokes etc. All images have been resampled in Photoshop to produce an effective resolution of around 150dpi for printing at full size.
My printer is going to do a test print for me, at 25% final size. He has asked for images to be no less than 100dpi for 100% output. He has asked for Generic CMYK so I'm using the PDFx1a2001 preset.
As recommended on here in a previous thread, I've placed each of 6x pages of the 100% PDF (75mb) into a new document and scaled each down to 25%.
I then export to PDFx1a2001 again, and the resulting PDF is 45mb.
My question is, how do I give him the most efficient file that will:
take ages to transfer to him
not be too large for him to process
give me good enough quality to see how things look.
Do I need to change the resample numbers in the PDF export dialog? Or should this be OK?
Many thanks.

You can print the original PDF to a PostScript file at 25% and run it through Distiller if you have it. But I would just export a 100% file with images at 25 ppi and have the printer scale down when printing.

Creating thumbnails / resampling image for DisplayImageFile?

Hello All,
I was trying to build a panel to show multiple photos (50) for verification (double click to view whole image in separate window) prior to upload for final storage.
I need to resample / thumbnail to approximately fit the control so that the memory usage does not go through the roof. These images will be from several cameras and as such the image type may change - but starting with jpg would go along way.
This may be as simple as a missed setting on the uir but I was not able to figure it out. I am not opposed to creating temp thumbnails on the hard drive and clean them away later.
Prefer CVI or SDK to ActiveX etc.
Thanks in advance,
Greg
Solved!
Go to Solution.

ebalci wrote: Probably SetCtrlBitmap function was there just to show an alternative.
I commented it without destroying the program requirements.
You can also put GetCtrlDisplayBitmap and DiscardBitmap functions inside "if (save)" block.
This may make things quicker if saving is not required.
Well, actually not. SetCtrlBitmap helps reducing memory occupation in the process: on a limited-memory machine, loading several big images can ultimately lead to a Out-of-memory error in DisplayImageFile and in not displaying the image on the panel. Reloading a smaller bitmap in the controls reduces this effect. As an example, on a 1Gb memory machine progressive loading of a 900x650 pixels bmp image generates such error after more or less 40 images loaded. The bigger the image, the fastest this effect will show. Trapping that non-fatal error permits the function to conclude but the images are not loaded to screen.
In that scenario, adding DiscardBitmap has no effect at all, as memory for the image is allocated inside the picture control.
...it seems your development machine is much bigger than mine
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

How can I resample image without losing quality?

I have an image which is 1200 x 800 at 72 pixels per inch
Now it is needed on a webpage so it needs to be small - I am told the image has to be 300 x 200
I want to maintain the quality.....
SO......
I get the original image: thus...
I then bring up the image resize dialog which shows:
I change the values so that the image dimensions are changed to 300 x 200 thus:
1200 changed to 300 - this changed the 800 to 200 for me... pressed OK
The resultant image is now:
Looks awful - What am I doing wrong?
Thank you in advance.
Terry

Any time you interpolate an image you will lose some image quality. For you either reduce the details you have for an image or your creating details you don't have for the image. The image you started with had better quality but that image no longer exist you have a new image now.
The size change and direction has a lot to do with how much the quality change is. If you throw away a lot of detail the smaller resized image my look very good on a display. However you resize a small web image to a 16" x 20" 300dpi print image it will not look good.
If the image has been sharpened using Bicubic Automatic or bicubic sharper is not a good interpolation method when downsizing for the web. Still there is just so much detail you can retain in 300x200 pixels.

Need to Resample the Image

Dear Friend,
    Resampling concept is not working through coding. Can anyone help me.
      Dim oPSDapp As Photoshop.Application
      Dim oPhotoDoc As Photoshop.Document
      oPSDapp.Preferences.RulerUnits = Photoshop.PsUnits.psMM
      oPSDapp.Preferences.TypeUnits = Photoshop.PsTypeUnits.psTypeMM
      oPhotoDoc.ResizeImage(90,,,5)
      --90 --> width
      --5 --> PsBiCubicSharper
Thanks in advance
Abu

Dear RubUOut,
     Thanks. It is working fine.
      I need to reduce the width of the image. Normally in Photoshop while reducing the width, we uncheck the 'ReSample Image' option and reduce the width size by default the resolution get reduced. This concept only we required through coding.
       How to uncheck the 'ReSample Image' option while reducing the image width.
Thanks and Regards,
Abusufiyan

FYI- IBA 1.1 image resampling to account for retina display

To make the ibooks ipad 3 ready IBA 1.1 now down samples images to 264 ppi(instead of 132ppi)
Because the display in IBA is based on 132ppi the measurements you see in the inspector are half what the resampled image will be.
IBA will down sample to double what the measurement is in the inspector
and anything larger then 1024pt in the inspector (2048 actual size)will be down sampled to 2048
example: if you place an image that is 3000pix square on a page and use at original size
IBA will re-sample to 2048px x 2048px
if you scale that image so it says 1500pt x 1500pt in the inspector
IBA wil resample to 2048px x 2048px
Anything scaled to less the 1024pt in the inspector will be resampled by IBA at twice that.
So if you scale that image to 900pt x 900pt in the inspector
IBA will resample it to 1800px x 1800px
if your original image is less then twice the inspector measurements IBA does not resample.
ie original image is 600pix x 600pix and you scale it to 400pt x 400pt in the inspector, it will not be resampled.
also note IBA 1.1 now converts non transparent PGNs to JPGs

your image original pixel size should be twice what it is displayed in the inspector(after you scale it to your liking).
anything higher IBA will down sample it to twice the size.
not a problem, but it doesn't make a difference to have it be larger.
so if your inspector shows image is 400pt wide(when you have it at the size you want)
and the original resolution is 1000pix wide, IBA will resample to 800pix wide
if the original image is 5000pix wide IBA will resample to 800pix wide.
If the original image is less then 800pix wide IBA does not resample it. (but you are also not taking advantage of the new ipads full resolution. May not make a big difference, will have to wait and see)
IBA will convert pngs(non transparent) and jpegs to jpgs with a medium/low setting compression.
so a JPEG with a "high" quality compression (small amount of compression) will be re-compressed to a medium/low quality.(more compression)
I don't remember if IBA 1.0 re-compressed jpgs. to a med/low quality.
if your book had lots of PNGs, you will have a smaller file size with 1.1 due to conversion to jpgs
if it was mostly jpgs, you will have a lager file size with 1.1 due to resampling at 264dpi instead of 123dpi
it would be nice if you could choose the amount of compression of the JPGs. But I'm guessing on a retina display you would not be able to till the difference, or there would be little difference between a "high" quality compression and a "medium" compression.
As far as settings in photoshop, I would not down sample or recompress your images before placing in IBA.
keep your original images at their original settings.
I would let IBA do the resampling. just note that if it is less the 256 dpi it may not look as good, we will see.
and don't up sample to get the higher res.
If you have a monster file that is really huge, yeah, you could down sample in photoshop just to make it manageable.
Cropping yes, do in photoshop, IBA does not crop
and this can affect image quality, will explain later.
When we have a new ipad to test on we can see if having all your images at 256dpi is worth it.
My test were all based on looking at the files after exporting as a ibook.
(unzip .ibook file and look at assets)
FYI - IBA actually down samples to 144 dpi at a page size of 14.22 inches.
14.22" page size is the magic number to get Pages to import into IBA at the same size.

When opening an image Photoshop Elements 12 is opening it in Camera Raw, it is not a RAW image and it is cropped How do I uncrop the opened image?

When I am opening a .jpg image not an actual raw camera image from Elements 12 it is being opened as a camera Raw image and the image is cropped, I can't find anyway to get the image to uncrop or zoom out so that the entire image is visible so that I can actually edit it to something that is useable. The images were taken with an iPad and copied I suspect using the organizer from Elements 11 but I can't be sure. If I could just uncrop the opened image so that the entire image is visible this would not be a big deal.
Is there a way to uncrop the image that is being opened by Camera Raw? Am I going to have to get my hands on the source of the images (the iPad) and copy the images again using explorer and not let them be copied with the organizer?

Uncheck the boxes at the bottom of the dialog Scale styles and resample Image so that only constrain proportions is checked. If you the change the resolution box from 240 to 300 you will get back to your original dimensions.
This is a meaningless thing to do, you still have the exact same number of pixels, you have only changed the metadata number in the file for ppi, and your prints are not affected by this number.
You could also use the same method to change the dimensions to 6 x 4 or 9 x 6 etc.
There are some cases (actually most cases) where you need to CROP the photo to change the dimensions, when the aspect ratio of the original photos is different than the aspect ratio of the final photo; the specific case in 99jon's example is the only case you ever want to change dimensions using Image->Resize->Image Size, where the aspect ratio doesn't change from 6x4 to 9x6 (or 12x8 or 18x12 or ...), and even then, you could do the same thing simply by telling the printer the size you want, you don't really need to do anything in PSE.

How do I delete multiple rows and columns in an image?

I am looking into how digital SLRs extract video data from a CMOS sensor. To give an example, the GH1 from Panasonic can record video at 1920 x 1080 from a 12 MPixel sensor that, say, is 4000 horizontal x 3000 vertical. How they do that seems to be not in the public domain, but there have been a few guesses (see http://www.dvxuser.com/V6/showthread.php?t=206797 and http://luminous-landscape.com/forum/index.php?showtopic=38713).
One approach would be to simply read every second row of sensor pixels (1500 rows read from the original 3000) and once you have those in memory, delete every second column (2000 columns left). You would end up with a 2000 x 1500 image which could then be resampled to 1920 x 1080.
I'd like to simulate what the camera appears to be doing, by generating a 4000 x 3000 test image and then asking Photoshop CS4 to delete the appropriate rows and columns. It may not necessarily be every second row; the Canon 5DMk11 appears to read every third row, so I may need to delete two out of every three rows.
Can Photoshop do that sort of thing? If so, how?

Thanks for the suggestions. Yes, I did take a detailed look at your images, but they weren't 100% convincing because it wasn't clear just what was happening. And Adobe's explanation, after reading it again, explains nothing at all to someone who doesn't know how Nearest Neighbor works.
But you are correct -- Nearest Neighbor does effectively delete pixels. I proved it with the attached 6 x 6 image of coloured pixels (the tiny midget image right after this full stop -- you'll have to go to maximum zoom in PS to see it).
These are the steps to delete every second row and then every second column.
1. Select Image > Image Size.
2. Set Pixel Dimensions > Height to half the original (in this case set to 3 pixels).
3. Set Resample Image to Nearest Neighbor.
4. Click OK and the image shoould now consist of three vertical white strips and three vertical Green-Red-Blue stripes.
5. Repeat steps 1-4, but this time set Pixel Dimensions > Width to half the original (in this case set to 3 pixels). The image should now consist of three horizontal stripes Green-Red-Blue.
Just to make sure the method worked for every third pixel, I repeated the above steps but with 2 pixels instead of 3 and obtained the correct White-Green, White-Green pattern.
I resampled the Height and Width separately for the test so that I could see what was happening. In a real example, the height and width can be changed at the same time in the one step, achieving the same results as above.
Finally, how to explain how Nearest Neighbor works in the simple cases described above?
Division by 2
In the case of an exact division by two (pixels numbered from top leftmost pixel), only the even numbered rows and columns remain. To put it a different way, every odd numbered row and column are deleted.
Division by 3
Only rows and columns 2, 5, 8, 11... remain.
Division by N
Only rows and columns 2, 2+N, 2+2N, 2+3N... remain.
To put it simply, a resample using Nearest Neighbor (using an exact integer multiple) keeps every Nth row and column, starting from number two. The rest are deleted.

How do I turn off the "scaling" feature in images?

I'm on Photoshop CS4. With the older version, I was able to select Image > Image Size, and then edit the size and resolution without any problem. If I chose a width of 4-inches, for example, it would automatically set the height to maintain that proportion. I would save the file, and then import into my layout program with that sizing intact.
For some reason, something has changed and I dont' know why. Now when I go to that menu, if I adjust the resolution and set the size that I want, when I import the file into my layout program (QuarkXpress), the image is HUGE....the same size it was originally. It's as if the sizing that I chose did not stick and is only recognized within Photoshop. In the file description bar within Photoshop (the one where you can click the X to close the file), it says that it is being "scaled." How do I turn that off? What is the problem? I didn't have this problem until today and I can't figure out what I accidentally did.
Thanks!

Look at the Resample Image check box!

Can I ask InDesign to resample as it exports to PDF?

When I export an InDesign CS document to PDF I'd like to know what InDesign does to the images that it exports. InDesign Help, in this case, was no help.
I'll give a preamble so you know what I'm on about. Originally when I first started this project 2 years ago, I thought I would layout the images within InDesign, and just before printing I would go through every one of the 800 or so images in the book (it's a big book), and crop and resample them to 300 dpi at exactly the final printed size. Big job.
After a few months of using InDesign I thought: no, I won't do that. When I export to PDF I'll assume InDesign will give me options to 'crop to frame size' and set the ppi to 300 dpi as well as converting images to grayscale if I so choose. It'll be automatic.
I'll make it clear with an example. Let's assume an original image was scanned to give an image that is 4000 pixels wide and 2000 high, and that the final image is 20" x 10". It is to be printed on a Xerox iGen which requires 300 dpi for no loss of quality. So how does InDesign get that particular image into the PDF?
Q1: Does it resample and export at 300 dpi? i.e. in the example above, will it export an image of 6000 x 3000 pixels to the PDF?
Q2. Or does it export the original image and does nothing to the image except cropping if I ask it to? If it needs resampling that will be done at print stage by the iGen.
Q3: I didn't see any options for converting to grayscale. Can you export a PDF as grayscale?
Why I am concerned about this is because if the original image is exported, that may cause me file-size problems. I scanned most of my images at 20MB-60MB, yet a lot of them when printed will be of the order of 20 square inches and only require about 6 MB for adequate printing. I may end up with a PDF file that is 5 to 10 times larger than necessary.
The real problem I have is: I trust PS and InDesign to resample my images, but I don't have that kind of faith in the iGen. If I can't ask InDesign to resample images when it exports, I may have a problem.
When I did my original series of test prints in July 2006 on the iGen, I cropped and resampled the images ready for printing before I imported them into InDesign. So I haven't tested the iGen's resampling capabilities. I be blunt I don't trust it. The iGen ( a machine costing in the millions) failed a simple test of converting colour documents to grayscale. Here are my notes written at the time:
b Converting to Grayscale using the iGen
Do not use the iGen RIP to convert colour images to grayscale because it converts all gray densities above 90% to 100%. ie dark shadows end up as 100% solid black shadows with the accompanying sheen. I measured this figure from the K-only gradient at the bottom of the page. It appeared solid black for the first 9mm of a 96 mm black-to-white gradient. All densities between 100% and 91% ended up as 100%. The effect is very obvious in Mums hair which became a solid mass.
My full notes on the iGen are here: http://jucreek.googlepages.com/temporary if anyone wants to have a look.
Anyway, that's why I have concerns about images. Maybe I should just knuckle down for a week and go through 800 images, cropping and resampling every one in Photoshop. Talk me out of it, please.
And that brings me to my final question:
Q4: Can I ask InDesign to do that job for me: to crop, to resample at a certain dpi, and to overwrite the original image so that it all matches up?

Guy,
Let me try to recap all your statments with my comments:
> Let's assume an original image was scanned to give an image that is 4000 pixels wide and 2000 high, and that the final image is 20" x 10". It is to be printed on a Xerox iGen which requires 300 dpi for no loss of quality.
From the very start you're in trouble.
The image size you describe, set at 300 dpi, will only be 13 1/3" by 6 2/3". If the image is scaled up to be 20" by 10", it will only be 200
>dpi.
So, we're starting with insufficient data according to your requirements.
Nothing that InDesign or Acrobat does can make that image the correct resolution.
> Q1: Does it resample and export at 300 dpi? i.e. in the example above, will it export an image of 6000 x 3000 pixels to the PDF?
No, InDesign and Acrobat's print device will only resample
b down.
Neither will resample up.
> Q2. Or does it export the original image and does nothing to the image except cropping if I ask it to?
The image created in the PDF will be cropped. It doesn't touch the original file.
> If it needs resampling that will be done at print stage by the iGen.
I believe the iGen will only resample
b down
the same as InDesign and Acrobat's creation of the PDF.
> Q3: I didn't see any options for converting to grayscale. Can you export a PDF as grayscale?
As mentioned, that won't happen in the PDF Export but will happen with the PDF Print driver. However, that will also convert colors in the ID file, not just images, to grayscale.
> Why I am concerned about this is because if the original image is exported, that may cause me file-size problems. I scanned most of my images at 20MB-60MB, yet a lot of them when printed will be of the order of 20 square inches and only require about 6 MB for adequate printing. I may end up with a PDF file that is 5 to 10 times larger than necessary.
Perhaps I did my math incorrectly, but in your original example, 4000 x 2000 pixels cannot be set at 20 inches by 10 inches at 300 dpi.
It requires 6000 by 3000 inches to be 300 dpi at 20 inches by 10 inches.
> The real problem I have is: I trust PS and InDesign to resample my images, but I don't have that kind of faith in the iGen.
I don't think you need to worry about the iGen if you set your images correctly. But as I said above, you haven't sampled them enough. So the iGen isn't going to do anything.
> If I can't ask InDesign to resample images when it exports, I may have a problem.
You set ID and Acrobat to
b downsample
not
b upsample.
> When I did my original series of test prints in July 2006 on the iGen, I cropped and resampled the images ready for printing before I imported them into InDesign.
Cropping and resampling in Photoshop is always preferred as you have the options for how the resampling occurs that neither ID nor Acrobat have.
> So I haven't tested the iGen's resampling capabilities. I be blunt I don't trust it. The iGen ( a machine costing in the millions) failed a simple test of converting colour documents to grayscale.
No, I wouldn't have expected the iGen to convert to grayscale at all! Converting to grayscale can be done in the Acrobat print driver, but I would prefer to do it in Photoshop if I demanded very refined conversions.
> My full notes on the iGen are here: http://jucreek.googlepages.com/temporary if anyone wants to have a look.
See my comments above.
> Anyway, that's why I have concerns about images. Maybe I should just knuckle down for a week and go through 800 images, cropping and resampling every one in Photoshop. Talk me out of it, please.
You can resample using Photoshop's batch processing, but depending on the type of cropping that might need to be done manually in Photoshop. But if the cropping is always of a certain size and position that could be done in batch processing.
> Q4: Can I ask InDesign to do that job for me: to crop, to resample at a certain dpi, and to overwrite the original image so that it all matches up?
No, InDesign doesn't overwrite your original image, but it will change the image in the final PDF.

Image Capture and Preview: bad PDF page size

When scanning to a PDF document with Image Capture, the resulting PDF always has an enormous page size. For example, a 3"x3" image scanned at 300dpi will appear as a 12.5"x12.5" page in the PDF. Scanning at 72dpi will create the appropriate size page, but the file is (of course) unsuitable for printing due to the low resolution. It's as if Image Capture (or the PDF creation routine) assumes the image is 72dpi even if it was scanned higher than that.
Similar behavior can be seen in the Preview app. Use the following steps to reproduce:
1. Open a decent quality image from a digital camera.
2. Choose Tools Menu -> Adjust Size...
3. Be sure both "Scale proportionally" and "Resample image" are selected.
4. Change the Resolution to 300 pixels/inch, change the Width to 3 inches and click OK.
5. Choose File Menu -> Save As...
6. Change the format to PDF, choose a location and file name to your liking, and click Save
7. Open the new document in Preview and check the page size (Tools Menu -> Inspector)
Inexplicably, the page size is now 12.5 inches wide. I understand what it's doing, but I don't know why. The math is simple. Take the 3x3 inch example above: 3in * 300ppi = 900px / 72ppi = 12.5in
I feel it's very bad form for the software to assume you always work in "screen resolution" (72dpi). The PDFs the software makes is next to useless for archival purposes because of the incorrect size markings.
Anyone know of an alternative application to scan to PDF docs? The scanner's TWAIN software is not an option because it's PPC and won't run under Rosetta. How about an application that creates PDF documents from image files (besides Acrobat)? Best would be a way to fix the behavior or Apple's software.
Thanks in advance.

I have the same problem long ago. Apple is not doing anything to fix this problem

Mixing Image Qualities in a PDF

I have a document I created in InDesign.
I and I would like to export for viewing on the web.
My problem is, when I export it using the standard preset, the images I want to be sharp are blurry.
When I export it for High Res Print, the 52 page file becomes 18 Megs vs 1 Meg.
Is there are way I can change lower the quality on certain images, and raise them on others?
I was also thinking of exporting it page by page, selecting different presets depending on how quality important each image is. And then combining it at the end.
Does anyone know the best way to approach this is, or should I just bite the bullet and force the visitor to download the 18meg file to view the document.
Jimmy

InDesign doesn't have an option at the export stage to choose different image resolutions for each frame in the layout, but it doesn't upsample - so if you switch out your high-res images for low-res copies (i.e. copy and replace the original image files on disc) you can control the process that way.
Acrobat can resample images via the Save As > Optimized PDF dialog, but it applies the reductions to the entire file.

Ways to implement image resizing using plug-ins?

Hi Photoshop developers,
I'm a developer with a few Photoshop filter and selection plug-ins under my belt, and I have a good understanding of the SDK and tools and suites it provides. My next project is an algorithm for enlarging/resampling images to different pixel dimensions. I'm wondering if anyone has any suggestions for or experience with the best combination of plug-in types to implement this.
Clearly, I can't just write it as a filter plug-in, since there is no way to change the image dimensions from within a filter.
I'd like the resized image to remain within Photoshop (as a new window or in the original one), so an export plug-in on its own is not sufficient.
Import plug-ins seem promising, since they allow the creation of a new document of the required size. However, as best I can tell from the Photoshop 6.0 SDK documentation, import plug-ins cannot access the image data from other open documents (or even the clipboard), nor do they provide any support for channel ports and the Channel Port suite.
My best idea at this stage is to create an export plug-in to provide the user interface and calculate the resized image, and then an import plug-in to import the resized image back into a new window. (I'm supposing a further automation plug-in would then be written to perform this export/import sequence.) The difficulty I see with this approach is how to communicate the resized image data between the two plug-ins. Since the resized image will potentially be very large, the ideal solution would be to store it in channels managed by the Channel Ports suite. However, I cannot see how the channel ports created in the export plug-in could be communicated to and used by an import plug-in. The alternative would be for the export plug-in to save the resized image to a temporary file on disk, however this seems unnecessary.
So, my questions, specifically, are:
a) Is it possible to create new channels using the Channel Ports suite (sPSChannelPorts->New()) in one plug-in, and have those channels persist to be used in another plug-in?
b) If so, how would the channel ports be communicated between the plug-ins?
c) Alternately, are there any alternative architectures available for implementing an image-resizing algorithm using the plug-in types that are available for Photoshop developers.
Any responses would be greatly appreciated; I know this is a low-traffic forum...
Thanks,
Matthew.

I would make an automation plug-in and a filter plug-in. 1) Run the automation which runs your filter to gather current image information 2) Create a temp file of the new document 3) Make a new document 4) Call the filter again to reload the temp data on disk <[email protected]> wrote in message news:[email protected]... > Hi Photoshop developers, > > I'm a developer with a few Photoshop filter and selection plug-ins under > my belt, and I have a good understanding of the SDK and tools and suites > it provides. My next project is an algorithm for enlarging/resampling > images to different pixel dimensions. I'm wondering if anyone has any > suggestions for or experience with the best combination of plug-in types > to implement this. > > Clearly, I can't just write it as a filter plug-in, since there is no way > to change the image dimensions from within a filter. > > I'd like the resized image to remain within Photoshop (as a new window or > in the original one), so an export plug-in on its own is not sufficient. > > Import plug-ins seem promising, since they allow the creation of a new > document of the required size. However, as best I can tell from the > Photoshop 6.0 SDK documentation, import plug-ins cannot access the image > data from other open documents (or even the clipboard), nor do they > provide any support for channel ports and the Channel Port suite. > > My best idea at this stage is to create an export plug-in to provide the > user interface and calculate the resized image, and then an import plug-in > to import the resized image back into a new window. (I'm supposing a > further automation plug-in would then be written to perform this > export/import sequence.) The difficulty I see with this approach is how to > communicate the resized image data between the two plug-ins. Since the > resized image will potentially be very large, the ideal solution would be > to store it in channels managed by the Channel Ports suite. However, I > cannot see how the channel ports created in the export plug-in could be > communicated to and used by an import plug-in. The alternative would be > for the export plug-in to save the resized image to a temporary file on > disk, however this seems unnecessary. > > So, my questions, specifically, are: > > a) Is it possible to create new channels using the Channel Ports suite > (sPSChannelPorts->New()) in one plug-in, and have those channels persist > to be used in another plug-in? > > b) If so, how would the channel ports be communicated between the > plug-ins? > > c) Alternately, are there any alternative architectures available for > implementing an image-resizing algorithm using the plug-in types that are > available for Photoshop developers. > > Any responses would be greatly appreciated; I know this is a low-traffic > forum... > > Thanks, > Matthew.

'Resampling' images

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