Resolution from Size and pixels of an image

Question

Is there any formula to calculate image resolution, if provided with image size and image height and width. I googled for an answer, but didnt get much of a help. Got one formula, but if i calculate with height and width of an image, the resolution i got is different from actual resolution.

Also if i have take a pic from 42 mega Pixel camera and 32 mega pixel camera, will the image size and dimensions vary?

Thanks Jithen

score 1 · Accepted Answer · answered Mar 11 '13 at 10:28

1

It's a simple cross-multiplication

if your image is supposed to have a width of 10 inches and is 1000 pixels wide, its horizontal resolution is 1000 / 10 = 100 ppi (pixels per inch).

Do I missed something ?

answered Mar 11 '13 at 10:28

Nicolas Repiquet

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My Image has got 768 X 1028 pixels width and height. So according to u, the resolution should be 768/12.8 = 60 PPI. (12.8 is width size in inches). Am i correct? – Coder Mar 11 '13 at 10:35
That's correct. Note that horizontal and vertical resolutions can be different. – Nicolas Repiquet Mar 11 '13 at 10:41
Thank you. I have my image size in KB. How to get size in Inches like width inch and height inch. – Coder Mar 11 '13 at 10:49
There is no relation between the size of a file (in KB) and the dimensions of the image it contains. – Nicolas Repiquet Mar 11 '13 at 12:48

Resolution from Size and pixels of an image

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