: How does size work with PNG-8 and PNG-24 images? I am desperately trying to save a psd file as a high res png. I found some relevant setting when I click Save for Web in photoshop but then

@Annie732

"Resolution" is the amount if points in a pre-defined space.

For example an image saved at 1000x1000 pixels printed at 10x10 inched, would have a resolution of 100dpi.

when you are working with image files (PNG, BMP, JPG etc), they are saved to a pixel heigh and width, the "dpi" is arbitrary as it could be printed at any size.

When you work with PDF / PSD / AI files, you can set up as if you are printing a specific size and dpi, the program then makes that file an appropriate pixel size for the selected output (EG it will create a workspace of 1000 x 1000 pixels if you size it to 10x10" at 100dpi)

(Breathe)

The confusion May be:
PNG 8 / 24 is purely a colour depth difference, however this COULD be referred to as "Colour Resolution" as png 24 contains 62,500x the colour information of a png8 file.

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@Shelton719

PNG-8 means 8 bits, so 256 colors maximum. PNG-24 means 24 bits, so 16,7 million colors max. Resolution is not an inherent factor of any format, so saying a PNG-8 is "low resolution" does not make sense, it only has low number of colors. You/the image you're saving determine the resolution. It is true though that PNG-24 has a larger file size (i e in kilobytes/megabytes) than a PNG-8 which contains fewer colors.

The DPI setting is just a print setting, you probably don't need to worry about it. Only the number of pixels matter when your destination is digital.

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