Show profile
Link to this post
Subject: Your eyes suck at blue (3)
Here are some visual proofs of something I covered a few years ago. Basically, the human eye sucks at blue. In the two example images below I've taken the Red, Green or Blue components of the image and pixellated 'em, so that each single pixel becomes a 3x3 square, nine times larger than the other two colours.
When you mangle the green, it makes a huge difference. When you mangle the red, it's mostly noticable on red. When you mangle the blue channel, you basically can't tell. Here's your proof:
![[Image: http://nfgworld.com/grafx/photos/RedBad.png]](http://nfgworld.com/grafx/photos/RedBad.png "http://nfgworld.com/grafx/photos/RedBad.png")
Pixellated red channel
![[Image: http://nfgworld.com/grafx/photos/GreenBad.png]](http://nfgworld.com/grafx/photos/GreenBad.png "http://nfgworld.com/grafx/photos/GreenBad.png")
Pixellated green channel
![[Image: http://nfgworld.com/grafx/photos/BlueBad.png]](http://nfgworld.com/grafx/photos/BlueBad.png "http://nfgworld.com/grafx/photos/BlueBad.png")
Pixellated blue channel
As you can see above, you can muck about with the blue channel as much as you want, and for these grey images you basically cannot tell. The red and green are noticable around the buttons, but they're yellow and so have almost no blue in 'em (RGB = 225, 160 and 50 respectively).
![[Image: http://nfgworld.com/grafx/photos/RedBad2.png]](http://nfgworld.com/grafx/photos/RedBad2.png "http://nfgworld.com/grafx/photos/RedBad2.png")
Pixellated red channel
![[Image: http://nfgworld.com/grafx/photos/GreenBad2.png]](http://nfgworld.com/grafx/photos/GreenBad2.png "http://nfgworld.com/grafx/photos/GreenBad2.png")
Pixellated green channel
![[Image: http://nfgworld.com/grafx/photos/BlueBad2.png]](http://nfgworld.com/grafx/photos/BlueBad2.png "http://nfgworld.com/grafx/photos/BlueBad2.png")
Pixellated blue channel
But this is interesting: you hardly notice the blue when it's pixellated, and the red mostly only affects the red parts of the image. The green though has an effect all over the place.
When you mangle the green, it makes a huge difference. When you mangle the red, it's mostly noticable on red. When you mangle the blue channel, you basically can't tell. Here's your proof:
Pixellated red channel
Pixellated green channel
Pixellated blue channel
As you can see above, you can muck about with the blue channel as much as you want, and for these grey images you basically cannot tell. The red and green are noticable around the buttons, but they're yellow and so have almost no blue in 'em (RGB = 225, 160 and 50 respectively).
Pixellated red channel
Pixellated green channel
Pixellated blue channel
But this is interesting: you hardly notice the blue when it's pixellated, and the red mostly only affects the red parts of the image. The green though has an effect all over the place.
BLEARGH
This post was edited on 2010-10-27, 17:18 by