An imager to control brightness and color curves. Separate curves can be authored for each R, G, or B component, along with the main curve to control the overall luminance response. Curve interpolation and working color space can also be set as needed. This imager will be more useful if your pixel values have already been tonemapped and are within the 0 to 1 range.
RGB colors edited in real-time using imager_color_curves
Enable
Enables the imager.
Layer Selection
Selects layers processed by this imager with a glob or operator expression. An imager can use a selection to determine what nodes will be selected to be processed by the imager at render time. The selection is an expression that can consist of multiple selections concatenated by: Each selection uses glob patterns and regular expressions and a node will be processed by the imager if the expression matches the node name. By default, glob matching is used unless the selection is in a regex quote, i.e. or (union)and (intersection)not (negation)and not (exclusion)() for nested scopingr'<my_regex>'. For example:specular or diffuse
not r'sss_(direct|indirect)'
r'color_(mask1|mask2)' or r'mask[34]'
R Position, R Value
The position and value arrays for the R (red) component are r_position and r_value. Together, these two float arrays define the points that the color curve will interpolate. This curve defines how colors will be remapped. r_position refers to the old values before the imager runs, and r_value refers to the new values after the imager runs. As an example if r_position = (0,1) and r_value = (0.25, 0.75) the imager will remap 0 to 0.25 and 1 to 0.75, thus decreasing contrast for the red component. The empty default leaves the original curve untouched.
r_position
r_value
R Interpolation
Integer array of interpolation types for each R curve point. The available types are:
G Position, G Value
This works like r_position and r_value but only on the G (green) component.
g_position
g_value
G Interpolation
Integer array of interpolation types for each G curve point. The available types are:
B Position, B Value
This works like r_position and r_value but only on the B (blue) component.
b_position
b_value
B Interpolation
Integer array of interpolation types for each B curve point. The available types are:
Working Color Space
The image will be converted to this color space before applying the remapping curve, and then converted back to the linear rendering color space. This is useful to apply the curves in a perceptual or roughly perceptual color space. If this is empty no color transform will be applied, and no assumptions are made about what color space the imager is working in.