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What is the resolution (in PPI) of your document?
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2680 x 3424px (270ppi)
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I think the trouble is Photoshop having to convert from physical units (Inches, metric, points) to pixels. In the Canvas Size dialog, if you enter your size in centimeters, you can change the measurement to pixels, and it will show how many pixels that would be. Since you want the same size on all sides, it has to be an even number, because there are no fractional pixels.
If the value is odd, you would have to change it, and decide to go up or down. If you do this often, it could be scripted.
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Thanks for the reply. Yes I had considered your reasoning and it makes abolute sense. As I said, when i use pixels it does work correctly.
My problem is it has always worked using centimeters as well and I've checked back on my images and the borderd appear to be accurate. This is not the case since the last update..
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Photoshop works in pixels, not centimeters. So this isn't surprising.
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Yes I understand that.
However the Canvas Size dialogue offers several options as in pixels, centimeters, inches, points, among others. The 'centimeter' option has been working pretty accurately up to the recent update. If they cant get it to work accurately why have the option there in the first place... I appreciate the most accurate option will always be pixels and pixels cannot be broken into parts and they dont fit neatly within centimeters or inches..
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I don't know what your previous settings were, so I doin't know why it was working the way you want. As far as I know, it has always worked like this.
Using physical units certainly has its place, especially for print, but the rounding errors are much more apparent when using small values.
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If your image resolution changes, sizing will change. 1cm @ 72ppi is not 1cm @ 300ppi.