Type - this is the type of transformation
used. These are the possible types:
Linear multiply - this mode will simply
multiply the final image colors based on their brightness are. Color
components that are too bright (above 1.0 or 255) will be clipped. This
can result in burnt out spots near bright light sources.
Exponential - this mode will saturate the
colors based on their brightness. This can be useful to prevent
burn-outs in very bright areas (for example around light sources etc).
This mode will not clip bright colors, but will instead saturate them.
HSV exponential - this mode is very
similar to the Exponential mode, but it will
preserve the color hue and saturation, instead of washing out the color
towards white.
Intensity exponential - this mode is
similar to the Exponential one, but it will
preserve the ratio of the RGB color components and will only affect the
intensity of the colors.
Gamma correction - this mode applies a
gamma curve to the colors. In this case, the
Dark multiplier is a general multiplier for the colors before
they are gamma-corrected. The Bright multiplier
is the inverse of the gamma value (f.e. for gamma
2.2, the Bright multiplier must be
0.4545).
Intensity gamma - this mode applies a
gamma curve to the intensity of the colors, instead of each channel
(r/g/b) independently.
Reinhard - this mode is a blend between
exponential-style color mapping and linear mapping. If the Burn value is
1.0, the result is linear color mapping and if the Burn value is 0.0,
the result is exponential-style mapping.
Dark multiplier - this is the multiplier
for dark colors.
Bright multiplier - this is the multiplier
for bright colors.
Gamma - this parameter allows the user to
control the gamma correction for the output image regardless of the color
mapping mode. Note that the value here is the inverse of the one used for
the Gamma correction color mapping type. For
example, to correct the image for a 2.2-gamma display, you should set the
Gamma parameter simply to
2.2.
Sub-pixel mapping - this option controls
whether color mapping will be applied to the final image pixels, or to the
individual sub-pixel samples. In older versions of VRay, this option was
always assumed to be on, however its default
value is now off as this produces more correct
renderings, especially if you use the
universal settings approach.
Affect background - if this is
off, color mapping will not affect colors
belonging to the background.
Clamp output - if this is
on, colors will be clamped after color mapping.
In some situations, this may be undesirable (for example, if you wish to
antialias hdr parts of the image, too) - in that case, turn clamping
off.
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