View source: R/vis_surface_background.R
| desaturate | R Documentation | 
Perform simple desaturation or grayscale conversion of RGBA colors.
desaturate(color, gamma_correct = FALSE)
| color | rgba color strings | 
| gamma_correct | logical, whether to apply non-linear gamma correction. First performs gamma expansion, then applies the gray-scale channel weights, then gamma compression. | 
rgba color strings, the gray-scale colors. The information from one of the three RGB channels would be enough. The alpha value is not touched.
Assumes sRGB color space.
see https://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
Other color functions: 
alphablend()
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