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jonmagic / grim

Tool for extracting pages from pdf as images and text as strings.

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Difference between quality and density?

kamok opened this issue · comments

commented

Is an image's quality not comprised of its pixel density and resolution?

What's the actual utility of the quality option?

commented

Is an image's quality not comprised of its pixel density and resolution?

What's the actual utility of the quality option?

Quality is inversely related to compression afaik. From https://en.wikipedia.org/wiki/JPEG:

The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality.

Also see https://github.com/ImageMagick/ImageMagick/blob/a7e810e41cfc29c9c8e6eabb43ea0c52e26d0664/coders/png.c#L10699-L10736 for some notes on png quality.