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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

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    Which version of photoshop you are using? Can you attach the screenshot of new document you created and canvas size dialog box?
    – Rishab
    Commented Nov 18, 2015 at 11:18

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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.

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  • As a corollary to this: Why is OP creating print docs in PS?
    – AMontpetit
    Commented Nov 18, 2015 at 16:15
  • @AMontpetit what does that have to do with anything? And where do you even see this is their entire workflow? For all you know they're doing a photo composite to import into InDesign.
    – Ryan
    Commented Nov 18, 2015 at 17:41
  • @coder3641 Note how you define the size of your document in centimetres, but the resolution is 72 pixels per inch. Since centimetres and inches are quite incompatible, you’re bound to get odd measurements. If you change your resolution to be, say, 30 pixels per centimetre (which is around the same as 72 ppi), you’ll get an even number, and the size of your document will be correct. Note: If this is intended for printing, you should use a higher resolution, otherwise it will be horribly pixelated. Commented Nov 18, 2015 at 17:52
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    @johnp: InDesign's internal measurement unit is the typographic point ... which is redefinable in its Preferences. I believe ID's internal internal unit is Adobe's standard approximation of 1/72th of an inch. Hence you get some rounding for whole-mm (or cm) values - but it will be at the very edge of the wavelength of visible light.
    – Jongware
    Commented Nov 18, 2015 at 20:11
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    @johnp It shouldn’t be, no. InDesign’s native units are the physical ones; Photoshop’s is pixels. Photoshop defines documents in pixels and calculates physical sizes by dividing number of pixels by resolution. InDesign defines documents in physical units and calculates pixel size by multiplying physical size with resolution (which I believe is always 72 ppi in InDesign). Commented Nov 18, 2015 at 20:14

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