Color Image adjustments
What is the method/example to use CWIMAQColor.Contrast and .Brightness?
I am using a pair of 1428 frame grabbers and Pulnix 6700CL progressive scan cameras.
Hi Steve,
I responded to your other thread. In the future, please try to limit the number of threads you create. As a result, the community and myself will better be able to help you!
Have a great day,
Robert
Similar Messages
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Bridge displays color images as b&w
I assume this has something to do with settings in Bridge CS4, my platform is MacBook Pro OS 6.8.10.
This question might confuse some people. To beging with, I do shoot my images in RAW files, I even have Bridge convert them to DNG files.
Upon download the images are displayed in color as they should be for RAW files. After editing images in Camera RAW, I convert most all images to sRGB. When some of those edited images come back to Bridge, they might be presented in B&W, though no color is lost to the file upon displaying in Photoshop, and I did not edit the file to be a B&W image. I have DNG, Canon RAW, Tif and Jpeg files, and most of these are displayed in color, but some are not, and I have not figured out the missing link just yet. So to be clear, I have Jpeg color images, displaying as b&w images, but they are color images. Only b&w images should be displayed as b&w.
This problems started once I learned I could edit one image in photoshop out of a series of images, then after editing, i could bring the single photo file back to bridge, and then copy/paste image settings onto a groups of images in Bridge, and all those images would then have the same adjustments made to them as a batch edit adjustment.
But now sometimes I get a B&W display on some images even when I do not apply a Bridge settings edits, and when I never edited the image for a B&W display. I has to a setting somewhere in Bridge, and I just have not figured it out yet.
Thanks in advance for all suggestions:ssprengel wrote:
Yammer asked a pertinent question that remains unanswered—is that “settings” badge (small lines-triangles-in-a-circle) shown on the B/W image thumbnails (at least). If you’re not sure, then include a screenshot of a few Bridge thumbnails where some are color and some are B/W, using the little camera icon on the web version of the forum messages.
And the answer is NO!. I only have those showing up associated with the .DNG files (Camera RAW)
Another similar question would be if you see a B/W thumbnail in Bridge, try doing a right-click (or whatever the Mac equivalent is) and choose Open in Camera Raw. Is the image in B/W or color in Camera Raw.
A <Control Click> (on MAC), opens the .jpeg file in b&w, as shown in the thumbnail.
Can you upload three versions of one of the images that display as B/W: the original PSD/raw/TIF file, a normal Save As JPG that is in color, and a Save For Web JPG that is B/W? Use something like http://www.dropbox.com/ and post a public download link to the images, here.
NO, I thought I explained that real well. Only the .jpeg file that was saved through the "Save for Web" processing ( that is, the a jpeg the goes through greater compression to reduce image file size for web display), is the image file process that produces the b&w thumbnail in Bridge ONLY. All opened images, of various file formats (ie: DNG, Psd, Tif, Jpeg, & Jpeg for Web), all present Color presentations (for editing in Photoshop, and or in display browsers). It is only the thumbnail of that particular jpeg formatting processing for Web Images that produces the b&w image "THUMBNAIL" in Bridge.
When you Save As JPG or For Web, are you ever overwriting the original image with a new one or do you always save the PS-edited image with a new name?
No, never. I leave my RAW files, as RAW originals, and work on newly names images files.
A theory about what is happening is that Bridge uses Camera Raw to generate its thumbnails, and the images that are B/W have some embedded Camera Raw setting, perhaps pasted from a different filetype, that makes CR think the image should be rendered as B/W, but when you open the images on Photoshop, you are opening them directly, without using the Camera Raw plug-in, so any embedded settings are ignored, and the image displays in its original state without the settings having been applied.
It makes since, (what you are saying), and it certainly does respond in that fashion. Your suggestion to open Ctrl Click, or Right Click to open the thumbnail in Camera RAW, was an interesting test, and the response was to open the previously save color image with a b&w thumbnail, into Camera RAW as a b&w image. So Camera RAW is responding to what is in the xmp settings that describes this images thumbnail to be displayed b&w. It is weird that a browser does not.
As to what is in the window selections for the "Save for Web" editing windows, Presets for jpeg are :
Progressive
Optimize
Embed Color Profile
And I use Embed Color Profile.
Even the Preview button at the bottom of the window, shows the color image as displaying color.
I vaguely remember about a year ago doing some CS 4 Photoshop and Bridge web tutorials from an unnamed tutoring website and guy named D_k_ . It is his fault. Just kidding, I actually enjoy those tutorial.
**** Okay, this is perhaps originating from Camera RAW presets, where you can apply previously made settings to other images and then saved them as Presets. Though I don't have this checked in Camera RAW ( still something goofy is going on there), I did find that in Bridge I can reset the individual "saved for Web" image thumbnail back to the the color image by :
Right Click (Ctrl Click, MAC) on the thumbnail
menu down to the "Development Settings" and select :
"Previous Conversion", and this presents the color thumbnail.
I have now tested all the Camera RAW settings in Camera RAW, by opening an image in each one of these :
Image Settings
Camera RAW Defaults
Previous Conversion
Custom Settings
and then reducing image file size, and saving for the web, while changing file name, and each and every one of these Settings produces a Sepia Toned thumbnail. I found out the images were a subtle Sepia Toned image by enlarging the Bridge Thumbnails bigger for a better view. So I can correct the thumbnail after it has been created, but so far, I can't get the thumbnail to be correct on first creation of the web saved jpeg image file. Regular jpeg image file thumbnails save correctly. -
In this Quick Tip, Julieanne demonstrates the new Color Lookup Adjustment layer and walks you through how to download a template to quickly apply these new “looks” to your images. The files she references can be found here. http://adobe.ly/Ng3afA
http://adobe.ly/LiGadTCan the Camera Calibration tech. in LR be used to keep IR raw images looking like the jogs on back of camera?
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FR: color temperature adjustment layer
I know there are 5 million methods to adjust colors in PS, but I would really prefer a simple (and almost scientific) method like the color temperature adjustment in ACR (with the green-magenta color cast adjustment).
Ideally, PS would read the current color temperature from the EXIF data (and adjust to any adjustment layers below), and give the option to pick a neutral pixel (and display the color shift based on that). in case there is no original color temp available, the grey pixel picker could be used to establish a base value, and give the user at least relative color shift values (or the user could enter the values by hand from ACR).
The reason for this is that most (pro) photographers probably know the color temp of their environments (lights, ambient, gels etc) (or can read those values from ACR), so adjusting values in regards to kelvin would make things much more precise than the ambivalent values of e.g. the color balance adjustment.What I was asking is a different method to achieve the same results what is possible with levels/curves/color balance etc without going into lab mode. (btw, the lack of a grey picker and the zoned approach of color balance isn't ideal sometimes)
thank you for reminding me that I need to brush up on my color theory. your reply has a tone of "why are you asking this, there are already tools for this" which I find a bit too conservative, when my intention is to make PS even more user friendly... if we would go with your paradigm, we wouldn't need levels, because everybody could just use curves, and yet both are very popular and often used based on the users preferences.
what I am asking is bringing the white balance settings from ACR into an adjustment layer, with all it's implications.
it would enable users to specifically balance images with mixed light sources (with the proposed color temp/WB adjustment layer with it's mask) by entering values in kelvin, and not some arbitrary numbers from 0-1 or 0-255. it would be so much easier to balance tungsten to daylight by adding 2000 kelvin to the image, or to control a straw gel that was added somewhere in the scene. I can imagine so many applications for this adjustment layer... -
Hello,
A really good feature would be color temperature adjustment for Adjustment Brush and Graduated Filter to be able to set a corect white balance through the whole picture. This could be a scenario: a sunset with (partialy) falling shadows (from trees) on some people. Also to have a White Balance Selector for those two adjustments.
Thanks.What I was asking is a different method to achieve the same results what is possible with levels/curves/color balance etc without going into lab mode. (btw, the lack of a grey picker and the zoned approach of color balance isn't ideal sometimes)
thank you for reminding me that I need to brush up on my color theory. your reply has a tone of "why are you asking this, there are already tools for this" which I find a bit too conservative, when my intention is to make PS even more user friendly... if we would go with your paradigm, we wouldn't need levels, because everybody could just use curves, and yet both are very popular and often used based on the users preferences.
what I am asking is bringing the white balance settings from ACR into an adjustment layer, with all it's implications.
it would enable users to specifically balance images with mixed light sources (with the proposed color temp/WB adjustment layer with it's mask) by entering values in kelvin, and not some arbitrary numbers from 0-1 or 0-255. it would be so much easier to balance tungsten to daylight by adding 2000 kelvin to the image, or to control a straw gel that was added somewhere in the scene. I can imagine so many applications for this adjustment layer... -
Image Adjustment Hue/Saturation questions
I have a picture of a car that I selected, that was originally red, and I am using Image > Adjustment > Hue/Saturation to change its color. The slider shows specific colors beneath it, such as blue, though that is not the color that the car color is changing to.
1.) Is it not changing to that color because I am selecting a blue hue, though after mixing with the red color of the car it becomes a new color?
2.) Is there any reason to feather the selection I made to the car prior to changing its color? Does this affect it at all?
3.) Are there any other tips for making the image appear better when doing something like this?
Many Thanks!Sorry, I am using CS5
1.) I was doing the Hue change previously to the "Master" in the drop-down and it seemed to change the color the same way as it is with the drop-down set to "Reds." What is the difference?
2.) If the 2 points in the middle are the ones that determine which range of colors get affected, what are the outer 2 points determining?
3.) "The first bar shows the colors as they appear originally." Is the first color bar showing a spectrum of all colors in the image? Because there are lots of colors in that bar, and the car I selected is just red, so I would think it would just show red if it was only colors in the selected image.
Thanks! -
Color Balance Adjustment Layer to blend faces?
I'm using 2 different images of 2 different people, and layer masking features from one person on to another. Afterwards, I play with the levels a little bit, though the skin tones from the different features are still off. I tried using a Color Balance Adjustment Layer, though I'm not really sure what to look for. I'm just eyeballing it, though are there any guidelines for doing something like this?
1. Should I be adjusting the midtones, shadows or highlights?
2. I added a little bit of red, is there ever a time when you might add add magenta or green to blend skin tone? What about yellow or blue?
3. Any other general tips for doing this?
Thanks.What version of PS are you using? I think there were a couple versions that variations was removed. If you have it, it should be done on the layer that you want to adjust the color, but I would make that layer a smart object first, so you could undo what ever you did.
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How do I convert color image to color vector?
Hi,
Im fairly new/not very well versed in Illustrator, I was wondering if you guys could help me with instructions or tips how to convert old alphabet art to color and actualy converting color images like drawings to vector . Ive tried image trace but it turns the image black and white and with really rough strokes.
Thank you!Is this art in the Public Domain? Or, do you have the copyright owner's permission to use it in your work? If the answer to both of these questions is no, then you should not be using it.
That being said, I got good results with image trace (using the High Fidelity Photo preset) even on the low-res image you attached here. You just have to adjust the preferences after you do the trace. -
How do I convert an image into a one-color (one PMS color) image?
Image > mode > grayscale. Then Image > mode > duotone. Pull down the "type" drop down menu to monotone and use the picker to pick your color. If you want a PMS, you'll have to click the color libraries button in the picker dialogue box.
I would make the grayscale conversion after creating a black & white adjustment layer to optimize the grayscale conversion.
If you don't need a PMS, but just a 4-color simulation, you can use a gradient map adjustment layer instead. -
How to use a grayscale color model in converting a colored image
how to convert a colored image into grayscale using :
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
int bits[] = new int[] {8};
ColorModel cm = new ComponentColorModel(cs, bits, false, false,
Transparency.OPAQUE,
DataBuffer.TYPE_BYTE);
please only this method , i don't need the "bandcombine" method cause i need to know that i have exact 256 grayscale colors, thanx in advance.I went into mail preferences in the first place. I found the fonts and colors and picked the color I want but it doesn;t seem to be sticking?
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I have been using lv_vfw.llb VI's for grabbing images from a CREATIVE WEB CAM ,i am able to get color images in the continues shot but when i try to snap a color image which i need for my processing i get only a monocrome image ,i have been trying to play around with the RGB weightings but i am unable to get a color iamge,it shall be of great help if you could help me in doing this as it is urgent for me.Thanks for your help.
vicky,
I am unfamiliar with the lv_vfw.llb, and have not used it before. However, I noticed that you stated that you are able to grab in color, just not snap in color. If this is the case, why not just perform a grab and then extract a single buffer from this grabbed data, which would likely be in color? This seems like a possible solution to the issue that you are seeing.
Other than that, I really don't know enough about the lv_vfw.llb to be of much help on this issue. Hopefully another member of this forum will be able to assist you with this software.
Regards,
Jed R.
Applications Engineer
National Instruments -
How to find out embedded raster image is Black&White or Color image?
Is there any possibility to find out the embedded raster image is Black&White, Gray image (or) Color image in "illustrator cs3" without using color mode shown in "document info" pannel. Kindly advice me, the possibilities and solution. And also any scripts avilable for this?
Thanks.Or you could select the embedded image, and open the Window>Document Info panel. Select Embedded Images from the fly out menu on the Document Info panel. This should give you the color mode and more info on the embedded file in question.
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Problem using IMAQ Array to Color Image vi
I am doing some pixel manipulation & while going from an image to an Image Pixels (U64) array using IMAQ Color Image to Array VI I cannot see the image once it is modified.
I am...
1) converting the image to the 64 bit pixel data using IMAQ ColorImage to Array.vi
2) doing the manipulation
3) converting back to an image using the IMAQ Array to ColorImage.vi using the 64 bit input.
What I get is...
1) a black image with data behind it... meaning... if I take the magnifier tool and go to the approximate locations of my image where I expect to find the manipulated data, it is there.
2) cast that image to a 32 bit image & still get a black image for the output. The data however is no longer there and appears to have been stripped.
3) no error's out of any VI's...
TIAWith Vision 2009 situation is not better.
It happened because U64 image displayed in full scale. So, if you have full range of intensities (from 0 to 65535), then you can see something. But if your intensities in small range, for example, 0...255 in all channels, then you will see black image.
Feel differences:
It should be possible to map U16 values into U8 display range with given range (like IMAQ WindDisplay Mapping does), but right now this feature available for I16 images only, not for U64. What you can do is following - map each channel to U8 (with linear LUT, for example), put channels together, then display 32 bit RGB instead of U64.
Andrey. -
In LABVIEW 2011 Is there a way to do an IMAQ FFT on a color image? The only thing that seems to work is on gray scale images. When I try to use a color RGB(U32) image, the FFT vi errors out with "Invalid ImageType".
Any suggestions?
Thanks in advance.
Solved!
Go to Solution.
Attachments:
Resolution Decrease.vi 46 KBThank you for the prompt reply Daniel.
What we are attempting is a de-resolution of a hi resolution image to simulate what a 1-4 reduction in resolution using a fiber optic taper will look like to a customer without having to built a very expensive actual optical system. If it proves to be an acceptable resolution, then we can move forward. The point is we need a fiberoptic imaging system due to environmental issues prevernting having an actual camera up close to the work being inspected.
So the idea is to convert the image to an FFT, remove any frequency component above the resolution we would see through the optical magnification, then recreate the image via a reverse FFT. Does that sound feasible or is there a simpler method of simulating a lowering of the resolution of an image? We can work on the gray scale image, as I believe this will prove acceptable for our demonstration. If color is required, we can talk about splitting up the color planes.
Warm regards,
Randy -
Convert color images to black&white bitmaps
Hi,
I have black&white scans of public domain books (image format). I use an OCR software to convert them to indexable PDFs (image+text format). However, the OCRed PDFs are insanely big: a 27 MB scanned PDF leads to an indexable PDF of 728 MB! And unfortunately, my OCR software doesn't have output settings, so I have to find a way to compress the files using Adobe Acrobat 9 Pro.
Using Advanced Options > Optimization does reduce the file size, but not significantly. The problem seems to be that my OCR software converts the black&white scans to color images, and encodes them as such inside the PDF. So I need a way to set the image modes back to black&white. I tried using the Advanced Options > Preflight dialog, and selecting "Convert to black&white". However, the resulting PDFs stay about the same size! It seems that "Convert to black&white" converts the images to grayscale, instead of to bitmap.
Any help would be appreciated!I mentioned "bitmaps", because when I open the original PDF and right-click a random page and select "Modify image..." and open the image in Photoshop, the mode is set to "Bitmap mode": meaning 1-bit mode, containing either black or white pixels. However, when I do "Modify image..." for the OCRed PDF, the mode is set to "RGB Color Mode". I think this explains, in part, the huge size of the OCRed PDF.
Maybe this table will make it more clear:
Original PDF (Bitmap Mode, 132 dpi)
Size: 27 MB
OCRed PDF (RGB Color Mode, 300 dpi)
Size: 728 MB
Now, from the table above, it's clear that I have to reduce the image resolution. So, using the Acrobat's PDF optimizer, I tried the following settings:
Optimized OCRed PDF: Try 1 (Downsample to 132 dpi, JPEG compression)
Size: 733 MB
Optimized OCRed PDF: Try 2 (Downsample to 132 dpi, ZIP compression)
Size: 449 MB
But 449 MB is still huge for a single book. And I don't want to reduce the resolution under 132 dpi, because I will loose quality. Clearly, if the original document is just 27 MB, I should be able to squeeze the OCRed document too. But I don't know how.
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