Search Results - ConceptArt.org | Art Sketchbooks, Wacom, and Art Forum
Join the #1 Art Workshop - LevelUpJoin Premium Art Workshop

Search:

Type: Posts; User: briggsy@ashtons; Keyword(s):

Page 1 of 34 1 2 3 4

Search: Search took 0.28 seconds.

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

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

    1886232
  9. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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...
  19. 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. 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. 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. 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. 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...
  24. 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...
  25. 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...
Results 1 to 25 of 832
Page 1 of 34 1 2 3 4