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How the "Pixel Dimensions" is calculate?

Oct 15, 2013 6:23 AM

Tags: #pixel #dimensions


In this panel the pixel dimensions show is 4,50M

I would like to know How the "Pixel Dimensions" is calculate ?

This 4,50M confuse me because my file size is 1,2M

Capture d’écran 2013-10-15 à 14.17.29.png

Thanks !!!

  • Currently Being Moderated
    Oct 15, 2013 6:45 AM   in reply to Pep

    PSD file format is a compressed format on disk after the file is closed and saved to disk. That's why the file size is smaller.


    The 4.50MB is the opened uncompressed size in Photoshop.



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  • Currently Being Moderated
    Oct 15, 2013 6:39 AM   in reply to Pep

    Depends on what file format you save in


    .psd - non lossy compression - the compression will make you files smaller. If you had many layers the file size coudl actually get bigger.

    .jpg - lossy compression - will make you files much smaller

    .eps -  if you choose no compression, and a preview -  file size would be larger than 4.5mb



    And also a very small amount of variation based upon your hard disk block size. This difference youi will mostly see on small web graphics.

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  • Noel Carboni
    23,488 posts
    Dec 23, 2006
    Currently Being Moderated
    Oct 15, 2013 7:05 AM   in reply to Pep

    No one has mentioned the origin of this measurement, so I will...


    Once upon a time serious imaging pros saved files in uncompressed 8 bits/channel TIFF format.


    It was common for people to speak of the size of an image mentioning its size when saved in that fashion, which is height x width in pixels x 3 bytes per pixel.


    Some people still use that jargon today, though the term megapixels has become more common and usable.



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