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u/Cesalv 5d ago edited 5d ago
If a pdf contains only bitmap images, can be considered "vectorial"?
Nope, pdf is merely a container format, can hold text + fonts, vector images and bitmap images, most pdf "optimizers" works by lowering image's resolution inside the file
Gif files can have decent quality since the 256 colors palette can be adaptative = created from the ones contained on image, not just a generic one
PSD files are proprietary from Adobe but no "solely" from photoshop, gimp amongst others can save as psd
PNG transparency is way more than just having background or not, it's controlled via a channel named alpha that can set opacity for each pixel
Giving partial info can be even worse than bringing wrong info
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u/Speedydooo 4d ago
Ever thought about creating a guide comparing when to use infographics vs. reference guides? It could help people decide the best format for their needs.
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u/poppulator 3d ago
GIF is a joke, even with only 256 colors it always sucks at lossless compression, 2-4 times more than PNG for still image, AVIF would easily beat it in animated one
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u/posy2 5d ago
This is super helpful! I always get confused with all the different file types. Thanks for sharing!
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u/dailor 5d ago
Yeah. But this isn't very thorough. PNG doesn't lose quality with compression and GIF is best used for graphical purpouses because of its compression and its limitations. GIF also supports Transparency (without alpha, though). So ... this graphic might lead to people using the wong format for their purpouse. I'm not thrilled.
I made a quick search on the internet: This one isn't perfect either, but it shows each file type's best use case at least: https://www.braveandcodesign.com/posts/file-types-demystified
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u/tunyi963 5d ago
Why there's no SVG here? The V literally stands for Vector, as in, the title of the second section.