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paulloseby
Inspiring
November 20, 2021
Answered

Why do my image sizes keep changing

  • November 20, 2021
  • 1 reply
  • 5859 views

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

Paul

This topic has been closed for replies.
Correct answer D Fosse

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.

1 reply

D Fosse
Community Expert
D FosseCommunity ExpertCorrect answer
Community Expert
November 20, 2021

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.

    P
    paullosebyAuthor
    Inspiring
    November 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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