picture of your homemade tools

Rich Ard said:
Not sure whee you're going with this. Purple isn't alone in that it is not a spectral color.
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Why do you care??? LOL....

Gray isn't a color either....I was going to say you never see a gray rainbow, but I realized that is eggzactly what you see....

Wasn't going anywhere (obviously), ust finishing my thought.....All done!
 
mydlyfkryzis said:
But, no one can specify the frequency of purple as there isn't one.
Red is 620- 750 nam, violet is 380 to 450 mm, but purple does not exist on any color frequency chart. Purple is a color our mind constructs when red and blue are present at the same time. But purple is not a specific, measurable color. Green, for instance, is 495-570 mm. No discrete mm for purple.

So while we see purple, it really does not exist as a spectral color with a measurable, specific frequency.


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This is wrong. Purple is a range of color often referred to as the "line of purple" or "purple boundary". It's the locus at the complete edge on a chromaticity diagram. As far as grey goes, there is no true grey. It always has a hue that exists within a range.
file200908240137279104.jpg
 
Except the actual visible light spectrum is not a circle... That chart reflects what our brain sees, and even on that chart, there is no specific frequency for purple. All the color Except Purple, on your chart, have a frequency. Red and blue are at opposite ends of the spectrum. We can disuss RGB versus CMY, additive versus subtractive color, but when we are talking visible light, there is no purple. While yellow and blue form green, green is a color. Purple is a color that is a contruct of our eyes and brain limitations. When you mix blue and green, you get another frequency, but not purple. there are a lot of write ups on this, outside of the internet too....

I never said gray is a color, but if you are color blind, gray is the color....same as purple.

I originally brouth this up because of a discussion of color blindness. If you are color blind, either the eyes have a defect, or the wiring is messed up, or can be some other problem. color is a perception, and even if you are not color blind, pruple is a valid color to our brains (not our eyes) as gray is to someone who is color blind. Heck, with the right hallucinogens, color can became a physicality to your perception....We cannot see past violet, and on your chart, violet goes into purple....that is great for mixing paint, but does not explain why we see purple.

I end this line of posting with this You tube explaining this.

http://youtu.be/iPPYGJjKVco
 

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mydlyfkryzis said:
... outside of the internet too....
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Ha. If I looked it up on the internet, then I might have agreed with you. Chromaticity is a concept of color theory which comes from my Masters training in Art. You're obviously speaking strictly scientific, for which I am wrong.

https://www.youtube.com/watch?v=Iy2GKyD2IoQ
 
deviant said:
Ha. If I looked it up on the internet, then I might have agreed with you. Chromaticity is a concept of color theory which comes from my Masters training in Art. You're obviously speaking strictly scientific, for which I am wrong.
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I would not say "wrong", rather, art is all about perception....So we do perceive purple.....But the way we perceive it interesting. Like many optical illusions, our brain does some interesting things with information.......What I found interesting is that something we percieve are not what we think they are...And if you are colorblind, your perception is very different too.
 
Not all homemade but i built or changed alot hopefully it wont suck to use
 

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