Graphics Reference
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Fig. 11.8 Large patches of contrasting colors present less of a problem than many small areas of
contrast between individual pixels as in the image on the right
image, but by reducing contrast, color, saturation, and intensity are affected to such
an extent that the resulting texture has effectively been bleached.
11.5.3.4
High Contrast Adjacent Pixels
Colors in each tile should not contain high contrast adjacent pixels (HCAP) unless
they are a specifi c requirement such as a black and white pattern on cloth. HCAP
cause noise patterns in renderings that are both distracting and unrealistic (Fig. 11.8 ).
To avoid them, work within a carefully defi ned hue and tone range, and do not
sharpen or otherwise manipulate the image in such a way that contrast is increased.
Digital cameras usually auto-sharpen every image. Artists should compare results
with this feature set to on or off to see the difference.
11.5.3.5
Hue Shift
The colors recorded in any photograph are an approximation of color values
refl ected from an object, as interpreted by your camera, based on various settings
and unique characteristics of your scene. The hue and intensity of any lights in your
environment will affect the color of your subject.
The diffuse color of your object is the pure color of your object, as it would
appear if lit completely evenly, without atmospheric interference, refl ectivity, or any
other effect to modify it. Lighting affects the apparent intrinsic color of everything
it comes into contact with, by adding its own color to that of the object (Fig. 11.9 ).
This is why, when a photograph is taken at dusk, every object in the photo has a
strong hue shift towards red. The hue shift is so strong that photos taken at this hour
without fi lters are unusable for color information.
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