Change resolution of image

I'm using CS3 and I'm putting together a small magazine. The printer who will be doing the printing insists that all images are 300 dpi, however, some of the images people have sent me to insert in the magazine are only 120 dpi. If I manually change it to 300 dpi in the Image Size dialogue box in Photoshop, does it actually increase the resolution? I was of the opinion that the original image has to be 300dpi and that it wasn't possible to alter it, but now I'm not sure. Any advice would be great!
Many thanks.

I only choose 300ppi as that is the value you choose in the original post. The smaller the image is when being printed the higher the ppi is
if you do not have resampled checked. Resampling allows photoshop to alter the actual pixels of the image.
If resample is checked then photoshop can either downsample (remove pixels) or upsample (add pixels). The problem with upsampling is photoshop does not know what the new pixels should be so it guesses. This can cause blurring or aritifacting. The best picture to have it one that is taken at the highest resolution you need. You are better off taking a picture that is higher in resolution than what you need and crop your image or down sample than to have an image that is to low of a resolution and try to upsample.
Think of resampling unchecked like scaling the image. You can scale the image up or down and only the ppi is changed.
Because there are no values in the above formula you can change the width and height to any value and the ppi will adjust accordingly.
The opposite it true as well you can change the ppi to any value and the width and height will adjust accordingly.

Similar Messages

Changing resolution and image size doesn't change result on screen?

I'm using Photoshop CS3. I am trying to change the resolution of several images that will be printed in a newspaper. So the current images are 72 ppi and really huge -- for example 36 x 27 inches (document size), and when I change them to 300 ppi, the image sizes shrink to about 8 x 6 inches, as I expect. But the image I see on the screen doesn't change. So, for example, when I open up the image originally, it's at 33% and the entire image is visible. After I change the resolution, and the image size has changed accordingly, the image still appears the same and it remains at 33%. Shouldn't the image shrink on the screen since its size has shrunk? Or if it remains the same on the screen, shouldn't the percentage shift? I mean if the document size is now 8 x 6, it should be able to be displayed at 100% and not fill my whole screen... I'm so confused. Thanks...

gradded,
The "Document Size" area of the Image Size dialog is just to indicate the size (in inches) that your document will be printed. The ppi adjustment has nothing to do with what is displayed on your monitor. Your monitor doesn't care anything about ppi. The monitor contains a certain number of pixels and after you change that ppi setting, the monitor will still have that same number of pixels.
As long as you leave the "Resample Image" box unchecked, your image size (Pixel Dimensions) will not change. You will see no change on your monitor. If you check the "Resample Image" box, then your image size (in pixels) will change.
Hope this helps.

IPhoto is changing resolution and image quality

I am currently and for the first time using iPhoto 6 to produce a book - a feature within the application. I have edited my images in Photoshop, some have not needed to be so they have simply been saved as either high-res JPGS or TIFFS. On importing them into iPhoto selected images are downsizing and stating that they are not big enough to print - this I know is not true as they are adequatley large enough for printing to A0 minimum at 300 dpi. There are also a select few that are changing in image quality - the colours are looking either bleached out or over-exposed and they have lost their original quality. When opening the exact files in Photoshop they are correctly exposed, perfect colours, sizes etc. If I am to try and 'retouch' them within iPhoto I can resume some of their quality but it seems through the transition into importing inot the application they are being corrupted.
Can anyone assist me as its driving me mad!!!
Thanks

What is the color space of the photos in photoshop?
In iPhoto Preferences, Advanced, do you have it set to add ColorSync Profile?
BTW, the 72 ppi (pixels per inch) is irrelevant. iPhoto defaults to reporting 72 ppi because that is a typical screen resolution. What's important is the total pixel dimensions of the image, and whether that size gives you an adequate dpi (dots per inch) when printed at the designated print size. So, while the image looks great on-screen in photoshop, that doesn't mean that it will be adequate for printing in a book. But you are right - you shouldn't see a significant shift in color when importing into iPhoto.
Regards.

Changing resolution of images ?

I like to shoot my pics in the largest resolution because it gives me the best print quality. However, when I email my images to family and friends I like to reduce them in size to normally 640 x 480 to make them easier to view especially on older slower computers.
I used to do this in Compupic but now that I have a 64 bit computer, CPIC no longer works.
Is there a way to do this in Photoshop Elements 8?
If not, any other suggestions?
Thank You.
ALAN

Yes,
Here are the steps I follow when I need low-res files for my Blog:
1. Select all the files I want to get with low-res
2. File>Export
3. Select the Folder where you want to get those files
4. Mention Resolution you want
5. Click OK
It should help you getting low-res files with simple steps....

Change image resolution using image events

Does anyone have an applescript to change image resolution using image events in OSX? I want to optimize my images for iWeb. I want to use a shell script in an applescript as a droplet or as a service in Automator. I'd like to leave the original intact.

No? Oh...ok den. No Applescripts at all.

Applescript to change image resolution using image events

Does anyone have an applescript to change image resolution using image events in OSX? I want to optimize my images for iWeb. I want to use a shell script in an applescript as a droplet or as a service in Automator. I'd like to leave the original intact.

For what type of use in iWeb are these photos intended? If it's for adding to a page (not a photo or album page) iWeb does a great job of optimizing. See my post in this topic: Re: Photo Resolution in iWeb.
You can optimize an entire site with an application like Web Site Maestro. It can reduce the site's size by up to 49%. Here's the settings available for the optimization:
Click to view full size
It's very effective.
OT

How do I change the JPEG image size in PSE-12 when opening from RAW

Switching from PSE-9 to PSE-12. When a JPEG image is opened RAW in PSE-12 the size is 18.72" Wide x 12.48" high 300 DPI. The same image in PSE-9 is 23.4" wide x 15.6" High 240 DPI. How do I get PSE-12 to open the image as in PSE-9?

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.

True Resolution for Image

Hi, as I search the internet for a particular popular image, when it pops up in Google image search, it shows up with a bunch of different resolutions / sizes / whatever you call it. I assume that when the image was originally created, it had one resolution it was created it, the one where it's the best quality. Is there a way in photoshop to figure this out? ie what is the optimal resolution that an image should be displayed at?
For instance, I'm doing an image search on "success kid" which is a popular meme. Of all the images that pop up, should I take the one with the highest resolution? But however could that have meant that it was resized to be very big?
Just a little confused about resolution in general.

charles badland wrote:
Well, you have the right to define words in any way you wish.
No, I don't. (see above Merriam Webster definition)
Resolution describes the detail an image holds. In MLTHO that concept is more accurately described by number of pixels, not size of pixels. The only thing image PPI indicates is how big pixels will print IF OR WHEN an image is ever printed. Period.
Image PPI describes printed pixel SIZE.
when people talk about "high res" or "low res" images... 99% of the time they are talking about pixel dimension (i.e., total number of pixels)
As you well point out, the Photoshop Image Size dialog contributes to this confusion.
There is more to it then number of pixels. You can have billions of pixels if the lens use was not in focus you have no details you have a blur. PPI is pixel size while different size UXGA displays all display 1600x1200 pixels each display size has a single PPI resolution. My 20" UXGA PPI resolution is 100PPI my 15" UXGA PPI resolution is 133PPI the same 1600x1200 image displayed on both is sharper and smaller on the 15" display then on the 20" display. 12"x9" on the 15" display 16"x12" on the 20" display. Printers can print different size pixels they are not confined to a single pixel size like displays so my Epson 4800 could print both the 12"x9" 133DPI image and the 16"x12" 100ppi image. PPI is pixel density it applies to displays sensors any device the displays or captures pixels. Resolution is also measured in resolving power how well a lens can focus a point or something like that. Displaying an image at different sizes on a display is done by scaling the number of pixels used to display the image with the display's single pixel size.
Photoshop Image Size Dialog supports two types of resizing controlled by the RESAMPLE check box.
With RESAMPLE Un-check you will see that the dialog top area is grayed out and can not be changed. The number of Pixels can not be changed and the Images Aspect Ratio can cot be changed. You will see that the Width, Height and Resolution are linked together in the middle print size area all you need do is to change one of these and Photoshop will calculate the other two. When RESAMPLE is un-checked the other controls in the bottom section are not relevant.
With RESAMPLE CHECKED the current Document Image will be replaced with a new generated image not a single pixel will remain intact. The number of pixel in the new imaged depend on the other setting used. The bottom section setting controls the resize operation. Interpolation how the new pixels are generated. Constrain when checked links the Documents Width and Height the Documents Aspect Ratio will not change and the image will not be distorted into a new aspect ratio. Scale Styles may or may not be grayed out. Layer Styles have absolute pixels settings not relative settings if you change the number of Pixels in an image layer style may look quite different if you do not have Photoshop scale the styles setting during an Image Size resize. With RESAMPLE CHECK it best to also check Constrain to prevent distortion. If you resizing for the web set the width or height in the top section that you want. Resizing for print first with RESAMPLE UN_CHECKED set the print width or height that you want. If the resolution falls below the resolution you need for printing CHECK RESAMPLE and set in the RESOLUTION you want the image printed at and set the interpolation method you wan used.
Printing: Your Printer resolution setting is a print quality setting. As long as you image DPI resolution is lower then the Printer's resolution setting all is fine. Printers use their higher resolution capabilities to paint in you image larger pixels. It like paint by the numbers fill an image pixel with drops of different color inks to produce the correctly colored pixel. There is no one to one correlation.

Imported mpeg videos change resolution.

I am importing mpeg videos to the project on PP 7.2.1 (4) under Windows 7 and they seem to change resolution and aspect ratio. Not sure if there is a setting that can be changed to override the aspect ratio and resolution when importing videos to the project ? Otherwise the video plays fine despite looking a little bit strange with this new aspect ratio of 1.1851.
The original video stream is (according to mediainfo):
Format                                   : MPEG Video
Format version                           : Version 2
Format profile                           : Main@Main
Format settings, BVOP                    : Yes
Format settings, Matrix                  : Custom
Format settings, GOP                     : M=3, N=15
Duration                                 : 44s 478ms
Bit rate mode                            : Variable
Bit rate                                 : 9 071 Kbps
Maximum bit rate                         : 8 900 Kbps
Width                                    : 720 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 29.970 fps
Standard                                 : NTSC
After importing it to the project the properties are:
Type: MPEG Movie
Image Size: 540 x 480
Frame Rate: 29.97
Source Audio Format: 48000 Hz - compressed - Stereo
Project Audio Format: 48000 Hz - 32 bit floating point - Stereo
Total Duration: 00:00:44:15
Pixel Aspect Ratio: 1.1851
Does anybody know if this can be corrected somehow?
Thank you

Thank you - I went through the tutorials and I think I am running into a different issue (at least this is how ti looks).
The original video when opened in source monitor (before importing it into the project) shows properties of:
Type: MPEG Movie
Image Size: 540 x 480
Frame Rate: 29.97
Source Audio Format: 48000 Hz - compressed - Stereo
Project Audio Format: 48000 Hz - 32 bit floating point - Stereo
Total Duration: 00:00:44:15
Pixel Aspect Ratio: 1.1851
and this is before importing it to the project just opening it in the monitor. Not sure what to think of it the video shows everywhere as 720*460 (16:9), when I click properties in windows in various media players and in MediaInfo but for some reason PP sees it as 540*480 (1:1851).
Thank you

Changing dpi changes resolution

Does changing the dpi of an image change the resolution of the image without changing the size?
I have an image that is 300 dpi that I need to enlarge 400% changing the dpi to 75.
I don't think manually changing the dpi to 600 will actually change the clarity of the image when enlarged 400%.
Is that correct?
Thanks
Cindy

First, DPI (dots per inch) is different to PPI (pixels per inch) despite the terms very often being wrongly interchanged. Photoshop works with pixels, not printer output dots.
http://www.google.com/search?q=dpi+v+ppi
Changing resolution with "Resample" enabled will result in changed pixels, but no change in the physical size (inches/cm/etc.) of the document.
Changing resolution with "Resample" disabled will result in unchanged pixels, but there will be a change to the physical size of the document.
You will not increase the clarity of an image by enlarging it.
The best way to learn what happens is to try things and observe the results.

Why does the elements 13 change resolution when going into the editor -- it is huge and unusable

why does the elements 13 change resolution when going into the editor? -- it is huge and unusable

Many mysteries...
Which is your OS version ?
Your screen is 1920 by 1080 pixels.
The problem appeared after having worked normally.
When we select a picture from the organizer (album) and click on the edit button. The editor software changes the entire computer resolution from 1920 x 1080 to 640 x 480 (very unusable).
That's not clear for me: did you click on the 'Edit' button on the bottom right part of the organizer, or did you use the menu or the right click popup menu to open the editor? In the second case, you are in the editor workspace.
We tried right clicking on the Elements 13 icon, select properties and under compatibility we made sure that "run in 640 x 480 screen resolution" was de-selected, and it was. Cannot find any properties window for the editor?
The editor has its properties in the 'Edit/preferences' menu, but there is nothing about resolution there.
Just to be sure : when you are in the organizer with the left 'Folders' panel shown, you highlight one of those pictures to edit. Then you right click and choose to "go to folder". Do the images are shown as 'offline' ? If that is the case, the original are on an external drive which is not connected, and what you are seeing is a 'preview' copy on your computer with 640 x 480 resolution.

Save for Web & Devices is changing resolution from 72ppi to 300ppi

Hi,
I'm writing an action to do the following.
Image size - change resolution from 300ppi to 72ppi
Automate - Fit Image - 600px x 600px
Save for web and devices - JPEG medium.
If I save at any stage (up to save for web & devices) the image is 72ppi
However when I open it again after saving for web & devices and check image size it's 300ppi HOW?
Am I missing something really stupid?
Peter

Hi Charles,
Sometimes we have to go through meaningless steps...
The spec for the job is to "automate" a process whereby we end up with a web suitable 600px JPEG of about 50k with © watermark.
Of course they are expecting a 72ppi image, so its easier if thats what they get!!!
The other requirement involves the fact that the web end of the business want to change the filename, so in order to keep a link, I write the filename to IPTC Title Field (using Peter Krogh's script)
However I've now found that if I "save for web & devices" with copyright & contact info, I get IPTC title and 72ppi,
So happy days....
Many thanks, but now just more curious to know exactly whats happening!
Peter

Very confused about ppi, resolution, and image size...

I have read so much on these things and even posted along these lines here and there, but remain totally confused.
Say the size of my pictures is around 2000 x 3000. Once I download them to PSE, the resolution is 72ppi. Is this default and could I/should I change this?
I generally do four things with my pictures.
First I edit them.
Next I email to family members.
Then I order prints (99% are 5x7 or smaller)
Finally I store them (on computer with CD backup).
Now, space is a bigger concern than quality since I print small prints generally. So what would be my best options for saving my files, but getting very nice prints?
Right now, once I edit, I save my files in .jpg, baseline "optimized" at 72ppi. Only following the computer defaults though, not because I think this is best. Would I be better off saving in TIFF or is this not necessary?
Any links with further info would be appreciated also.
Thank you,
Amy

Amy,
1. I just took a picture today, and when I look in Image>resize>image size the dimensions are as follows:
W=2288px H=1712px W=31.778" H=23.778" @72px/in. resolution
When I change resolution to 325 px/in., W=7.04" H=5.268"
As the resolution is increased, the dimensions decrease. This is what is called an inverse relation.
Why did I change to 325px/in? Because for printing it is desirable to have a resolution of 240-300 px/in, or so. Also, note that this resolution gives me almost a perfect 5x7 size format, and one can crop off the excess readily. If one desires 4x6 size, one can crop to that dimension.
2. I enhance the pictures next, leaving sharpening for the last step
3. I save primarily in PSD and/or JPEG. Both PSD and TIFF allow one to retain layers, are lossless, and thus one avoids degradation with sequential editing. JPEG is is a compression format which conserves disk space (in comparison to PSD and TIFF), and is most likely required for your e-mail and your photo finisher. I save some of the JPEG files. I usually elect baseline optimized, and the JPEG allows me to elect quality 8, which is good for my purpose and results in a manageable file size.
4. Right after I download my picture files from the camera, I burn them to a CD (i.e. before I do anything else), and right after I finish the final edits I burn them to CD as well. This is my "film", if you will. If the computer fails or if I should accidentally delete a file from disk, I still have it available.
I am sure that others will post, but that is my current work flow.
Ken

Changing size of image in Aperture

I just purchased a Nikon D2hs which has only a 4mp sensor. The image is pretty small relatively. I want to print at 13x19" on my Epson 2200 printer. In PS which is what I am used to, I upsized the image to 13x19" and resolution to 300 dpi and then after everything else, I would apply sharpening on a layer to preserve the original. In Aperture, it seems there is now way to raise the resolution and image size before applying sharpening. I think what happens is that you apply sharpening to the original 4mp image and request Aperture to print at the desired size. Aperture then upsizes the image at a dpi it determines is adequate and sends that to the printer with the sharpening applied before upsizing. Also does Aperture use the same bicubic sharper method of upsizing images that PS uses?
Is this correct. If I understand, in version 1.1, will we be able to use the workflow normally used in PS as I described above.
Also, speaking of sharpening, if anyone knows, will aperture version 1.1 have sharpening tools similar to smart sharpen or the PS version of USM?
I have not seen a specific description of what specifically is changed in Aperture 1.1. Is there a website that shows the tools added and changed and how they changed or for the new ones what they will look like and how they work?
A lost of questions I know. I am anxious to actually see 1.1 in operation as I know many of you are. Thanks for any help here.

I just purchased a Nikon D2hs which has only a 4mp
sensor. The image is pretty small relatively. I
want to print at 13x19" on my Epson 2200 printer. In
PS which is what I am used to, I upsized the image to
13x19" and resolution to 300 dpi and then after
everything else, I would apply sharpening on a layer
to preserve the original. In Aperture, it seems
there is now way to raise the resolution and image
size before applying sharpening. I think what
happens is that you apply sharpening to the original
4mp image and request Aperture to print at the
desired size. Aperture then upsizes the image at a
dpi it determines is adequate and sends that to the
printer with the sharpening applied before upsizing.
Also does Aperture use the same bicubic sharper
method of upsizing images that PS uses?
It's hard to say what method of upsizing Aperture uses. If you wanted to stay with that workflow, you'd probably be better off editing your image externall (in Photoshop), then resampling and applying the sharpening you need. When you save at the larger size Aperture will pick up that change.
Also, speaking of sharpening, if anyone knows, will
aperture version 1.1 have sharpening tools similar to
smart sharpen or the PS version of USM?
I am pretty sure not, though no-one has really done a good look at exactly how Aperture fares in comparison to other sharpening methods.
I have not seen a specific description of what
specifically is changed in Aperture 1.1. Is there a
website that shows the tools added and changed and
how they changed or for the new ones what they will
look like and how they work?
There are two places I know of.
Aperture's official 1.1 page:
http://www.apple.com/aperture/update.html
and my own Inside Aperture page with a little more detail on minor things they do not talk about on the update page:
http://insideaperture.com/Site/Aperture%20PMA%20New%201.1%20Features.html
Basically I would categorize the 1.1 update as primarily addressing RAW conversion quality and flexibility. The only new adjustment tool would seem to be the RAW Fine Tune Tool, I do not think any of the other adjustment tools have been modified.
The other big things addressed are DPI settings around export (so you could properly resize) and also the color meter (not exactly a tool). My own favorite thing fixed is actually the loupe, which displays real pixels at any level of magnification.
There are probably a lot of other little bug fixes included, and possible some feature tweaks as well. But I don't think you'll see anything major that's not on the list for this update.

Setting Resolution in Image Ready

Is there a way to change the resolution in image ready when you use "save optimized"? I have an image in Photoshop that is 96 dpi and I want to keep that resolution, but it's automatically changing it to 72 dpi. I have CS2.
Thank you in advance!

As the other posts suggest, just focus on width x height measured in pixels.
Image resolution is irrelevant for web images.

Change resolution of image

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