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1. ## Thread: Comparing color to value, ends up messed up

by briggsy@ashtons
Replies
6
Views
421

### "Brightness"(B) in HSB is not value. It is...

"Brightness"(B) in HSB is not value. It is brightness relative to the maximum possible for a given hue (H) and saturation (S). I have a diagram on my site showing the relationship of S and B to value...
2. ## Thread: What is colour?

by briggsy@ashtons
Replies
0
Views
295

### What is colour?

This is a response I produced for the 2014 Flame Challenge, sponsored by actor Alan Alda, to answer the question "What is color?" in a way suitable for school children. I don't know how it will go...
3. ## Thread: Light Source Spectrum and Color Subtraction

by briggsy@ashtons
Replies
9
Views
688

### This isn't current science. When the trichromatic...

This isn't current science. When the trichromatic theory was first proposed it was assumed that there were three receptors with widely spaced sensitivities peaking in red, green and violet (Young) or...
4. ## Thread: Light Source Spectrum and Color Subtraction

by briggsy@ashtons
Replies
9
Views
688

### The physical aspect of subtractive mixing is...

The physical aspect of subtractive mixing is fairly straightforward: the light reflected by an object is found by multiplying together, wavelength by wavelength, the spectral energy distribution of...
5. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: That's exactly what I'm saying - the intensity...

That's exactly what I'm saying - the intensity (luminance) is the same because the smaller amount of energy is concentrated in a correspondingly smaller visual field.

Sure, it's the nonlinear...
6. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Sorry, I haven't really gone into the BB effect...

Sorry, I haven't really gone into the BB effect in great detail myself because to be honest it seems a rather arcane issue in the context of practical painting. There's even some debate over whether...
7. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Mister Janichan, The striped sphere in white...

Mister Janichan,

The striped sphere in white light looks really good, but your method only seems to be letting you paint setups where the main light and the shadow illumination are the same...
8. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Fair enough, then. This is what it looks like: ...

Fair enough, then. This is what it looks like:

1886232
9. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: You really couldn't find a coloured ball?! (And I...

You really couldn't find a coloured ball?! (And I don't mean a picture of one on Google!). Or couldn't you find direct sunlight? :)
10. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: I think it's really great that you want to...

I think it's really great that you want to understand things, and of course I'm not advocating the ignorant "just paint from life" rubbish that infected ca.org over the last few years (I mean in the...
11. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Hi guys, my post from yesterday seems to have...

Hi guys, my post from yesterday seems to have vanished permanently, but anyway I seem to have managed to get my email notifications working again. It's great to see so much activity here, but by far...
12. ## Thread: 2 Questions - mostly on lighting and PS technique (repost)

by briggsy@ashtons
Replies
3
Views
501

### hexo, you may also find the following post useful...

hexo, you may also find the following post useful with regard to the absolute basics of the relationship of the tools available in Photoshop to visual appearance: ...
13. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: I guess the answer depends on how deep you are...

I guess the answer depends on how deep you are and whether or not the water is at all turbid. However in your documentary I assume they were using artificial light sources for lighting; these would...
14. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: The Dimensions of Colour (huevaluechroma.com...

The Dimensions of Colour (huevaluechroma.com) is now all clear on Google. As it turns out there was never any malware on the site itself, the warning was triggered solely by two links back to the...
15. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Unfortunately the entire site at the University...

Unfortunately the entire site at the University of North Carolina (ibiblio.org) that hosts my website has recently started giving a malware warning in Google Chrome. Hopefully ibiblio.org will fix...
16. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Blue light is removed by out-scattering out of...

Blue light is removed by out-scattering out of the beam to the eye, but also added by in-scattering into the beam. But while each additional kilometre of distance adds the same amount of blue light...
17. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: Mr J, Why not just stand in the middle of the...

Mr J,

Why not just stand in the middle of the room and look? What you see is the light coming from each point in the environment. Chances are most of the indirect illumination is diffuse...
18. ## Thread: The Dimensions of Colour - a colour theory discussion thread

by briggsy@ashtons
Replies
332
Views
158,178

### Sticky: You're very welcome TINJ! 1. You seem to be...

You're very welcome TINJ!

1. You seem to be interpreting the chart as intended: at 80 degrees the light energy (a linear parameter) is down to 17%, but it's perceived brightness (a nonlinear...

by briggsy@ashtons
Replies
6
Views
723

### Might be a good chance to work on your art...

Might be a good chance to work on your art history and theory! Hit the library, and look at artists and periods you don't know much about yet. If it's too hard to take notes, dictate them, it will...
20. ## Thread: Confusion, Traditional Color Theory for Digital Artists. (Corel Painter/PS)

by briggsy@ashtons
Replies
3
Views
834

### First off, red and blue (with yellow) are the...

First off, red and blue (with yellow) are the historical primaries; they are typical of "traditional" (= dumbed down) colour theory that is still widely taught, but they don't really work for paints,...
21. ## Thread: Greyscale underpainting. Superior technique or beginners shortcut?

by briggsy@ashtons
Replies
15
Views
1,814

### The subject is not so rarely discussed as all...

The subject is not so rarely discussed as all that, and is often derailed by not making a distinction between a full-value greyscale underpainting (in the intended final values of the painting) and a...
22. ## Thread: Colouring from grayscale

by briggsy@ashtons
Replies
8
Views
881

### You're welcome, Johan and zeedurrani, and you...

You're welcome, Johan and zeedurrani, and you can't be blamed for not knowing about it before. Plenty of online documentation from Adobe and elsewhere talks about what the Hue, Saturation, Color and...
23. ## Thread: Colouring from grayscale

by briggsy@ashtons
Replies
8
Views
881

### This works much better if you use Lab mode...

This works much better if you use Lab mode instead of RGB mode (assuming your greyscale values are right to begin with!)

In Lab mode a "Color" layer keeps the same Lab lightness (L) as the base...

by briggsy@ashtons
Replies
4
Views
836

### To understand quantitative relationships of...

To understand quantitative relationships of colour presupposes a good grasp of the dimensions of colour. They are the subject my colour site (below), but start first with the Gurney book if it's all...

by briggsy@ashtons
Replies
1
Views
654

### Additive mixing - see section beginning:...

Additive mixing - see section beginning:
http://www.huevaluechroma.com/041.php

Subtractive mixing - see section beginning:
http://www.huevaluechroma.com/051.php

Colour mixing in paints...
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