Beyond the Ariel

[Pano]

Originally Posted by Lynn Olson

... the displayed gamut should range from bright yellow to dark indigo.

That would make a nice visual scale of intensity, I agree.

And even monochrome can do well if used well.
There are the same number of steps in each gray section as in the color version.

[Lynn Olson]

Just spoke to Gary Dahl on the phone; he's making good progress on the system integration, and is pleased with what he's hearing so far. More to come.

[soongsc]

Originally Posted by panomaniac

That would make a nice visual scale of intensity, I agree.

And even monochrome can do well if used well.
There are the same number of steps in each gray section as in the color version.

Looks terrible with the red.

[Pano]

Yes it does.
You like this better?

[soongsc]

Originally Posted by panomaniac

Yes it does.
You like this better?

That looks like a video test screen for black and white TV.

[soongsc]

Originally Posted by Lynn Olson

Just spoke to Gary Dahl on the phone; he's making good progress on the system integration, and is pleased with what he's hearing so far. More to come.

Hope he's faster than I. I have one that I was pleased with over a year ago. But it just kept getting better that Kept me wondering how good will it get.Hit the G spot when I zeroed in on the interconnect.

[gedlee]

Originally Posted by panomaniac

My point, which I must not have made well, is that the color scheme in Elias's graph is visually misleading. As yellow appears brighter to the eye then any of the other colors, the yellow areas appear to have a "higher" value. They do not. In fact it's the dark red color that represents the highest values. Unfortunately for the sake of visual clarity they don't look "higher".

That's why I suggested that another color scheme might better represent the levels to the eye.

You made your point quite well, I undertood it immediately. I use the "JET" scheme (or close) because it was easy to program and uses the whole range of colors - thats why it is done. But your point is completely correct.

So using the standard RGB scale of a PC what should the color range be that identifies the levels by brightness? I'd like to use the whole range of colors and I don't like grey scale because it definately is not ideal (been there done that).


And this is not a trvial point IMO.

[JohnPM]

Originally Posted by gedlee

So using the standard RGB scale of a PC what should the color range be that identifies the levels by brightness? I'd like to use the whole range of colors and I don't like grey scale because it definately is not ideal (been there done that).

There is more than one answer to that. The luminance (greyscale equivalent) of a given RGB colour is Y = 0.3R + 0.59G + 0.11B (for typical RGB primaries), achieving a uniform range of Y is possible using many RGB combinations.

[mige0]

Please Pano, leave it in color - you know - *a bunch of gray pictures* simply would not "sound right"...
LOL

I really love you guys approaching the issue from a simple side !!



Michael

[gedlee]

Originally Posted by JohnPM

There is more than one answer to that. The luminance (greyscale equivalent) of a given RGB colour is Y = 0.3R + 0.59G + 0.11B (for typical RGB primaries), achieving a uniform range of Y is possible using many RGB combinations.

OK, then it should be easy since I am only asking for one solution!

Let's say we start with yellow at the top, which is 255 red and 255 green in RGB. Should I assume that it should end in red?, no probably blue by what you say above. My point to Pano would simply be that it is no simple matter to come up with a color algorithm that would produce a continuos array of colors such that the luminance would be a continuos slope. In fact, it may not even be poossible.

What about yellow -> green -> blue -> purple -> Red ? What you want is a scheme like "Jet" which only varies one color at a time, then another one and so on. Otherwise its a complex mess.