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PNG does not have a PPI value container. It has a pHYs chunk that measures pixels per meter. In combination with roundtripping between meters and inches and floating point restrictions that is as close as you can get it to report a resolution of 401 ppi. All that really matters is that you have correct number of pixels though. PNG is not meant for print ...


Here is the answer: It depends ;) Apart from your confusion between alpha and pixel density, The possibilities are quite vast so there is no real answer. It depends on many things like which color profile is used and if you have a consistent color setting in your programs. In web the big fun begins when you realize that not al browsers support color ...

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