Page 1 of 1
The Sky is Blue
Posted: Wed Jan 09, 2013 5:14 pm
by Paolo
Or is it?
I made this observation today.
A nice picture I took reads 130R-170G-230B, according to a point sample in Photoshop.
82aae6 is the selected value in the color picker.
Still, we're taught that the sky is blue, when in fact, it contains red and green as well.
I was surprised at how replacing the sky values with 0R affected the image.
Discuss...
Re: The Sky is Blue
Posted: Wed Jan 09, 2013 7:52 pm
by Dave (imported)
Our eyes preferentially see a blue sky because of the way they are made.
All colors are subjective and we might be the only species that uses color for art and beauty and entertainment.
Re: The Sky is Blue
Posted: Wed Jan 09, 2013 9:59 pm
by Cainanite (imported)
The yellow we all see on our computer monitors and on our TVs has no yellow in it. There are only three colors on your screen. Red, Blue, and Green. It combines Red and Green to get something that our eyes see as yellow.
It is our eyes that are weird, not the colors of the world.
It just happens to be the way we evolved. Humans are odd creatures.
Re: The Sky is Blue
Posted: Wed Jan 09, 2013 10:36 pm
by moi621 (imported)
But
Is what you see as blue and what I see as blue really the same blue
or were we just taught to call our respective Blue-s, blue.
Re: The Sky is Blue
Posted: Thu Jan 10, 2013 1:14 am
by boingboing (imported)
There's a Radiolab piece where they talk about colors, and one thing they note is that blue was not recognized as a color in classical times. Even more recently some cultures did not/do not recognize it.
Re: The Sky is Blue
Posted: Thu Jan 10, 2013 10:34 pm
by A-1 (imported)
...ROYGBIV... red, orange, yellow, green, blue, indigo, violet... ...long wavelengths to short wavelengths... ...low frequency to high frequency... you "see" only the wavelengths that are REFLECTED... the rest are absorbed or simply not emitted in the first place.
...white is ALL colors reflected in equal portions, black is nothing reflected... Rods are the light cells in the retina if the eyes that are concentrated on the peripheral part of the retina and allow black and white night vision, and cones are around the middle (fovea) and handle colors and give us daylight vision.
...eyes... funny little things...
The sky is "BLUE" because of the specific gravity, density of the Earth's atmosphere. The light is 'bent' into the blue part of the spectrum... I have to see my optics book to explain it properly, with matrices...
