Graphics Reference
In-Depth Information
Figure 2.4.
Grass and dirt texture example. Original image (left) and result after the
encoding/decoding process (right).
textures in mind, the color probe added on the image is of course severely de-
graded, but clearly shows that the estimation algorithm picked the green-purple
color plane as fitting the image best. These extreme colors may not be used
directly on the texture, but we should remember that all colors resulting from
blending green and purple are available at this stage and this includes colors with
reduced saturation in the transition zone. Because of the separate treatment of
pixel luminance, the luminance values are unaffected except for processing and
storage rounding errors.
Figures 2.5 and 2.6 show two examples of textures with mixed materials.
This time, the estimation process has chosen a blue-yellow for the first and a
Figure 2.5.
Rock and stone texture example. Original image (left) and result after the
encoding/decoding process (right).
