• tetris11@lemmy.ml
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    11 days ago

    why though? The graphics represented in the screen are already squashed and scaled, so you wouldn’t be preserving their quality in any case. If you’re worried about text, JPEG should still be able to handle it under high quality settings

    • B0rax
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      11 days ago

      We can ask the same the other way around: why do you want to use jpg if it results in a bigger size and worse quality than png?

      • tetris11@lemmy.ml
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        11 days ago

        But that’s patently untrue: take this 10 MB example TIFF file as an example.

        • PNG Compression, max compress (=quality 9):

          convert file_example_TIFF_10MB.tiff -quality 9 test.png
          
        • JPG Encoding, 99% quality (=quality 99):

          convert file_example_TIFF_10MB.tiff -quality 99 test.jpg
          

        Final file size comparison:

        9.7M Sep  5 13:21 file_example_TIFF_10MB.tiff
        1.7M Sep  5 13:22 test.jpg
        2.5M Sep  5 13:22 test.png
        

        PNG is significantly larger, and difference in quality between them is negligible

        • B0rax
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          11 days ago

          Dude. Did you even read what I wrote? PNG is bad for photos. Your example is a photo. Go ahead and try the same with a screenshot with text and menus showing.

        • ms.lane@lemmy.world
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          11 days ago

          png - jpg

          156K Sep  5 23:06 Screenshot_20240905_230459.jpg
          137K Sep  5 23:05 Screenshot_20240905_230459.png
          

          jpg with 80% compression, via krita.

          As B0rax said, for screenshots, png is better - it can represent line graphics and text more efficiently.

          • tetris11@lemmy.ml
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            11 days ago

            Thanks for this. Still, I would be curious to see this for a 4K level image. Also I wonder if your screenshot tool did a bitmap copy of the screen or intrinsically converted it to PNG first before pasting it into your paint editor.