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  1. The problem is that the word "saturation" is used...

    The problem is that the word "saturation" is used in several quite different senses and you are using it in two different senses here.

    In the first paragraph you are using "saturation" in the...
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    It doesn't actually work that way, because the...

    It doesn't actually work that way, because the light values change more than the dark values. To a very close approximation the values retain the same relative (proportional) difference, not the same...
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    Yep, or the material or the lighting might be...

    Yep, or the material or the lighting might be non-uniform. There are many reasons why the far corner might appear darker than the near corner, but the photons having to travel further isn't one of...
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    Sure, and that's a tough one regarding teaching...

    Sure, and that's a tough one regarding teaching skills, since a person to whom a skill came relatively easily often doesn't understand the difficulties of someone who needs to work harder at it, or...
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    Amen to that. Part of the problem is that too...

    Amen to that. Part of the problem is that too many artists accept wrong information on faith and then pass it on when they become teachers. If more students critically examined what they are being...
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    I agree with the first part, objects generally...

    I agree with the first part, objects generally don't get darker as a result of being further away from us, because the reduced amount of light energy reaching us is exactly balanced by the reduced...
  7. In the simplest case of an object turning out of...

    In the simplest case of an object turning out of a white light source under white ambient light, you'd expect the shadows to have the same saturation as the lights but lower chroma (strength of...
  8. Sticky: Well, your quest to track things back to the sun...

    Well, your quest to track things back to the sun sounds like complete madness to me, but the site should help you to understand exactly what brightness and saturation mean in the colour picker. ...
  9. Sticky: The Theory of Colour - Lecture series, Art...

    The Theory of Colour - Lecture series, Art Gallery of New South Wales
    For anyone who is in Sydney in November, you might be interested in this series of public lectures I'm giving for the Art...
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    In a realistic representation of light, it's true...

    In a realistic representation of light, it's true that if a given local colour of say, value 8 in the light, drops to 1/x of value 8 in the shadow, then local colours of other values will drop by...
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    Poll: NSFW - Nudity Definitely female, though disturbed for me by the...

    Definitely female, though disturbed for me by the prominently muscular neck: female necks are usually fuller and smoother in the thyroid region. It might also help if the ear had not been made quite...
  12. It's the platysma, which runs as a very thin...

    It's the platysma, which runs as a very thin sheet over all the others. One of it's actions is to pull/hold the corners of the mouth down and outwards.
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    Well, in your example the result depends on what...

    Well, in your example the result depends on what yellow and blue you use, but if you choose two that are additive complementaries then additive-averaging gives you grey rather than green, as shown in...
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    No problem. Blending in Normal Mode at fractional...

    No problem. Blending in Normal Mode at fractional opacity involves what is known as additive-averaging or "partitive" mixing, one of the three basic kinds of colour mixing (the other two being simple...
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    Many beginners greatly overestimate the accuracy...

    Many beginners greatly overestimate the accuracy of their own drawings, and this "unconscious incompetence" is a major factor holding them back. The benefit of drawing casts is that they stay...
  16. I have some info here on how CMY primaries work...

    I have some info here on how CMY primaries work and how CMYK relates in theory to CMY, but I'm not sure that's what you are asking about:
    http://www.huevaluechroma.com/052.php...
  17. The typical approach prior to the second half of...

    The typical approach prior to the second half of the nineteenth century was not painting over greyscale, nor direct painting, but involved variations on the idea of "painting in layers" over a first...
  18. Benedikt is right, but you might be able to...

    Benedikt is right, but you might be able to significantly restore the look of the work you've already done by a gamma adjustment on your laptop. In Photoshop it's under Adjustments > Exposure.
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    Your diagrams look good. Imagine that there...

    Your diagrams look good.

    Imagine that there are a series of parallel roads heading off to the horizon following the direction of each of the cast shadows. From your point of view a road through a...
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    The construction uses the anti-solar point to...

    The construction uses the anti-solar point to indirectly represent the location of the light source because the actual location isn't in the picture plane. On the horizon vertically above the...
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    The "light vanishing point" is the anti-solar...

    The "light vanishing point" is the anti-solar point - the point directly opposite the position of the sun.

    It's easiest to understand how it works if you think of the sun on the horizon at dawn....
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    You seem to have the basic idea:...

    You seem to have the basic idea:
    http://www.huevaluechroma.com/021.php

    One common approach is to use the unshaded colour of the paper for the centre light, and white chalk for the highlights....
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    In the book there is an example of a leg drawing...

    In the book there is an example of a leg drawing that starts with what is clearly a blind contour, which is what I have usually done, but the main thing is that you do the drawing blind, and don't...
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    Sounds just right to me - you're not bound by...

    Sounds just right to me - you're not bound by anatomy or perspective, but you do understand them.

    Perspective is actually a good analogy. Just as lines in an image that converge on a vanishing...
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    Nothing at all wrong with your question,...

    Nothing at all wrong with your question, gillianseed! The vertical line shows a set of colours in which Photoshop Hue and Saturation remain constant and only Brightness changes, so yes, it does give...
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