View Full Version : 72DPI to higher DPI not acting as it should

01 January 2006, 10:25 PM
It used to be that when I moved/pasted an image of 72DPI into a document that had a higher DPI, the image would get smaller. But now it's the same size.

Anyone know?

01 January 2006, 05:15 PM
turn off resample image :)

01 January 2006, 07:00 PM
I can't seem to find that in the prefs. It is in image size under image, but that's not what I'm looking for. I'm copying/moving a layer/image from one document to another. It's resampling it and I don't want it to.

01 January 2006, 01:23 AM
no, it wont resample it when you drag may resize it, but not resample it. The only way it will do that is if its pasted from another package and it rasterises it as you paste it.

01 January 2006, 01:59 AM
it may resize it
yeah I know, and that's what I want. But it's not happening.

01 January 2006, 12:49 AM
Can you post some more details describing your problem.....

Are you using CS2?

What are the dimensions in pixels for each of the 72 dpi image and the 300 dpi image?

What is the pixel aspect ratio for both images? (Under the 'image' menu).

Are you 100% sure that your dpi setting is pixels/inch and not pixels/cm in both files?


01 January 2006, 03:55 AM
Yes I'm using CS2.

The dimensions. Well say I have an image that's 1024 x 768 at 72DPI. The other is the same resolution but at 300DPI. When I paste/move the image in the 300 DPI document, the image get smaller, because of having to squeeze more pixels per inch. At least that's how it used to be. I used to do it with 150DPI but that shouldn't make a difference.

Aspect ratio is square and yes it's per inch.

01 January 2006, 05:17 AM
OK..I see. This is how photoshop always works.

You are pasting one 1024x768 image into another 1024x768 pixel image which is why you don't get any change in size.

The DPI setting in image size does not have any effect on the pixel dimensions (provided 'resample image' is checked off). All this setting does is define to photoshop (and other applications) how big each pixel is. If you increase the DPI (with resample off) you will notice the pixel dimensions do not change but the actual document size decreases and vice-versa.

So if you tell photoshop to use 300 pixels per inch of space, then your 1024 pixels wiil only take up 3.413 inches of space across if printed. 1024pix at 72dpi will take up 14.22 inches across if printed.

Telling photoshop how big each pixel is will have no visible effect or change on screen. Those 1024 pixels will take up 1024 pixels of your screen when your image is zoomed to 100% regardless of what dpi they are.

When you are pasting between documents, you are simply pasting pixels. Photoshop copies pixels from one file and pastes then directly onto the pixels of the second file. The DPI is irrelevant.

Where you say that it used to behave differently before, you must have had different pixel dimensions hence the difference in size.

I hope my explanation makes sense.

01 January 2006, 04:04 PM
Where you say that it used to behave differently before, you must have had different pixel dimensions hence the difference in size.
That must have been it, cuz I can't think of anything else. Thanks.

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01 January 2006, 04:04 PM
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