ppi of images

has many images that requires the specifications to be 20mm wide by 25mm high. ppi to be at least 250.. is there a free software that can easily check if the images meet the specifications?
grnowAsked:
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everlast4308Commented:
A plain-jane image file shouldn't care about ppi.  This depends on your screen, or how you print it (if you print it).  If my math is right, 20mm x 25mm @ 250ppi comes out to 197 x 246 pixels.  That is, if an image is at least 197 x 246 in size, and you print/view at 250ppi, you're all set.  If an image resolution is higher than that, provided you force the 20mm x 25mm dimensions, your ppi will simply increase.
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grnowAuthor Commented:
Hi everlast4308, can advise how you calculate it to be 197 x246? thanks
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everlast4308Commented:
Sure.

Assuming square pixels, your 250ppi guideline applies to each axis.
20 mm = 0.788 in . . . 0.788 in * 250 px per inch = 197 px width
25 mm = 0.984 in . . . 0.984 in * 250 px per inch = 246 px height
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grnowAuthor Commented:
thanks
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