Jeffrey Carl Faden's Blog
Why does red always seem to be the most pixellated color with highly compressed JPEGs?
It has to do with red as a color. It has the most energy of any color on the visible spectrum, so we notice gradiations in it more, because we have more to compare it to. We’re far less likely to notice gradiation in purple because it doesn’t have the same energy spectrum.
Also the same reason why we don’t “red-screen” very often, it bleeds too often compared to blue and green screening, because of the energy spectrum it has.
Makes sense. One image that really shows this in particular, though, is this book cover I found: http://www.good-cool.com/ds_books/tsurigetyou.jpg
This leads me to believe it’s more than just our vision. It’s probably a well-defined shape yet it’s one of the most pixelated parts of the image.
That could be attributed to variations in compression implementation and such. I dunno. If you really want to find out go look up some technical documents.
There’s something wrong with that image.
I don’t know about that. I’ve raised and lowered compression on JPEGs with red in them like that, and after a certain point, the red parts halved in resolution. I doubt it’s any problem with that particular image.
“It has the most energy of any color on the visible spectrum”
I thought it had like.. the least
Yeah i think blue is the color that you see the most gradations in. and red does have the least energy out of all visible light.
How does the algorithm work? I don’t know how JPG compresses images. Maybe it compresses the reds more or something.
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