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Why is it that the image with the scrambled pixels looks mostly grey, even though it contains all the colors, just scrambled? Even the effect is amplified when
by dynlib 5y ago
Why is it that the image with the scrambled pixels looks mostly grey, even though it contains all the colors, just scrambled? Even the effect is amplified when the image is zoomed out
- willis936 5y agoMean([R(0:255), G(0:255), B(0:255)]) = 50% gray
- OscarCunningham 5y agoTo add to this, the amount of energy actually being sent out of your screen isn't a linear function of the RGB values. So to find what the mixture will look like you have to convert them to linear values using the formula here https://en.wikipedia.org/wiki/SRGB https://en.wikipedia.org/wiki/SRGB, then take the average, then convert back. So '50% gray' is actually #979797. This should match the level of grey which the image appears to be if you view it at full resolution. It will only match the zoomed out image if your computer also uses the correct averaging formula.
- zerocrates 5y agoThe small image on the main page is a 256x256 version of a full-size... 4096x4096 image. So each pixel in the small version is going to actually be an averaging of a 16x16 block of original pixels. Because they're randomly distributed, mostly that averaging is going to result in medium gray. Zooming out is going to do something similar (though the exact effect would depend on how the zoom algorithm works). Plus, your eyes/brain are going to do some smoothing/averaging of their own even where the screen is able to display individual 1:1 source pixels (consider for example that every pixel on what's probably an LCD you're viewing the image on is itself some combination of red, green and blue subpixels).