Wednesday, March 17, 2010

[jules' pics] 3/16/2010 11:02:00 PM

Egaratenjin, originally uploaded by julesberry2001.

Wikipedia says, "International Klein Blue is outside the gamut of computer displays, and can therefore not be accurately portrayed on webpages." I wonder if it is true.

Anyway, here is some Japanese Shinto Orange.

Posted By jules to jules' pics at 3/16/2010 11:02:00 PM


Tom Adams said...

It's probably true that International Klein Blue is outside the gamut of computer displays. But I am so sure it cannot be portrayed on a computer display.

Let's consider a simpler case, easier to understand. A display has three guns RGB. All that can be displayed is a mixture of the three. The violet in a rainbow (or the spectum) has a wavelenght below all three, so it's outside the gamut. But, a quick search will turn up lots of website where rainbows and the spectrum are protrayed.

How can this be? The eye has 3 basic color receptors, and if you can use the three color guns of the display to get those three receptors to activate at relative levels kind of like the levels they are activated to by violet then you see something like violet. In other words, purple is within the gamut and purple looks like violet.

But there are differences. You can bring purple in relatively clear focus, but your eye does not have the natural ability to bring violet (or the low end of the spectrum) into focus.

(You can learn to focus a voilet image, say an image made out of violet lights. It feels like you are defocusing it, but the image appears floating in space.)

skanky said...

That's interesting, thanks.

International Klein Blue is on display in the Tate Modern*, for anyone in, or visiting, London.

Don't know if other museums, elsewhere, have it?

*tbh I tend to prefer the building to most of the contents.

David B. Benson said...

Yes, there are colors which cannot be rended with just three phosphors, typically RGB. While true across the entire visible spectrum, the most noticable deficiences are clustered around green. For example, true emerald green cannot be rendered on a computer monitor.

High quality "coffee table" art books use (I think) about 7 colors plus black and still are unable to completely faithfully represent important works of art.