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Editorial Team
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Asked: 2026-06-18T02:32:44+00:00

I can get PPI for a JPEG image using the following command: $ identify

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I can get PPI for a JPEG image using the following command:

$ identify -format "%w x %h %x x %y" mypic.jpg 
1600 x 1200 72 PixelsPerInch x 72 PixelsPerInch

However, when I run the same command on PNG format I get Pixels Per Centimeter:

$ identify -format "%w x %h %x x %y" mypic.png 
1600 x 1200 28.35 PixelsPerCentimeter x 28.35 PixelsPerCentimeter

Is there a way to change the command to get Pixels Per Inch (PPI) for PNG format as well or perhaps calculate the PPI based on the pixels per centimeter?

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1 Answer

  1. Editorial Team

    The resolution and units used are stored in the file, so if the resolution is stored in PixelsPerCentimeter, that’s how identify will display it. There isn’t a way to do the conversion automatically through identify. But it’s just cm to inch conversion math:

    PixelsPerInch = PixelsPerCentimeter * 2.54
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