how to save a png as a smaller file but the same resolution?

Posted by Radek on Pro Webmasters See other posts from Pro Webmasters or by Radek
Published on 2011-01-03T10:01:55Z Indexed on 2011/01/03 10:59 UTC
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image

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png

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resolution

not sure what stackexchange site is the best for this question.

I have a scanned jpg file with below properties and size 8.5MB

pixel dimension: 2468 × 3484 pixels
print size: 208.96 × 294.98 millimeters
resolution: 300 × 300 ppi

I need to save the file as png while the size cannot be bigger than 4MB. The most important is that the size of picture must remain the same. I mean that the object size in the picture must stay the same.

Could anybody tell me what is used to define the size of the objects in the picture?

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