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Ray blend colors

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When ray_blend_colors is set, it knocks out the RGB component of the ray_blend_red, ray_blend_green, ray_blend_blue. For example, without blending a rainbow picture looks like:

Ray blend off.png

but if, before ray tracing we set,

set ray_blend_colors, on
set ray_blend_red, 1.0

as you can see PyMOL has knocked out all red coloring,

Ray blend red.png

The amount of the colored component left is: (1.0 - (ray_blend_COLOR)) * original_color