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Why do my image sizes keep changing

Explorer ,
Nov 20, 2021 Nov 20, 2021

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I'm using Photoshop 2.0.1 on a Mac running OS Monterey

 

I set a size for the image but then, whenever I do anything, that size changes.  I can set the image size at 297mm x 211mm and then, after I have made any alteration to the image, it changes to a totally different size (have attached an example).

 

Can anyone please tell me what the problem is or what I am doing wrong?

Many thanks

PaulPhotoshop sizing problem.png

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correct answers 1 Correct answer

Explorer , Nov 20, 2021 Nov 20, 2021
Many thanks for that.  I'm now 73 and try to keep up with technology etc but sometimes, I appear to be a little slower on the uptake. I do appreciate your help Kindest regards Paul

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Adobe Community Professional ,
Nov 20, 2021 Nov 20, 2021

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You need to watch the pixel dimensions. Photoshop basically has no concept of "size" - it only works with pixels. Pixels have no size, they are just data points.

 

A physical size is set by the simple formula "pixels per inch" (ppi). Setting a ppi number translates from pixels into a physical size.

 

Uncheck "resample image"! This uses the ppi number to scale the image up or down. In effect, it reverses the formula.

 

In short - as long as the pixel dimensions don't change, the file itself is unchanged. The key to unlocking this whole thing is in those three words: pixels per inch. It means exactly what it says.

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Explorer ,
Nov 20, 2021 Nov 20, 2021

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Many thanks for that.  I'm now 73 and try to keep up with technology etc but sometimes, I appear to be a little slower on the uptake.

 

I do appreciate your help

 

Kindest regards

 

Paul

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