NodeGroup Usage Guide: AgMax
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General
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.. image:: ../images/agmax/AgMax_Screenshot.png

This compositor nodegroup is intended to be used with the View Transform (in the Color Management panel) set to the “Standard” option.

Controls
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Exposure (Stops)
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Adjusts image exposure in `stops <https://photographylife.com/what-are-exposure-stops-in-photography>`_ (occurs prior to highlight desaturation). Works the same as the Exposure slider in Blender’s Color Management panel.

Dynamic Range Compression
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Controls how much the bright parts of the input image are reduced in luminosity to include more highlight detail in the output image. Lower values produce more blown-out highlights, and higher values make a softer, less contrasty, look with more colorful highlights.

.. image:: ../images/agmax/Dynamic_Range_Compression_Sweeps.png

Highlight Desaturation Knee Softness
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Higher values produce visually smoother highlight desaturation behavior in bright, saturated color gradients—slightly sacrificing maximum saturation.

.. image:: ../images/agmax/Highlight_Saturation_Rolloff_Knee_Softness_Sweeps.png

.. image:: ../images/agmax/Highlight_Saturation_Rolloff_Knee_Softness_Rainbows.png

Abney Effect Hue Compensation
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The human eye tends to perceive pure RGB blue as a bit purpley when white is mixed with it, pure RGB red as a bit pinkish when white is mixed with it, and pure RGB green as a bit cyanish when white is mixed with it.

This setting controls the extent to which the hues of these colors get adjusted the more whitening-desaturation gets applied to them, compensating for human visual perception.

.. image:: ../images/agmax/Anti-Abney-Effect_Hue_Rotation_Sweeps.png