why canvas size show 1 mm different from chosen size?

I create for example 12*5 cm document in new and when I select canvas size from image menu in Photoshop it show 11.99*5.01

I am using adob cs4 portable version.enter image description here

enter image description here


Photoshop only deals in whole pixels when sizing the canvas. 12cm x 5cm = 340.157px x 141.732px. Photoshop is simply rounding each dimension to the nearest pixel.

Source : Link , Question Author : coder3641 , Answer Author : 13ruce

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