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package ocolor
Conversion functions
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These function allow converion of color to a larger encoding. Since a terminal with 24-bits colors capability can also print 4- and 8-bits colors, they are never used in the library. However they are avaiable for the developpers.
val color8_of_color4 : Ocolor_types.color4 -> Ocolor_types.color8Make a 8-bits color from a 4-bits color. This is not depend on configuration (current palette), since 4-bits colors are a particular case of 8-bits colors.
val color24_of_color8 : Ocolor_types.color8 -> Ocolor_types.color24Make a 24-bits color from a 8-bits colors. This is sometimes depend on the configuration. Greyscale and 6*6*6 color cubes are pure results (not configuration-dependent), but encoding a stadndard 4-bits color into 24-bits color use the current palette as set in Ocolor_config.palette.
val color24_of_color4 : Ocolor_types.color4 -> Ocolor_types.color24Make a 24-bits color from a 4-bits color. This depends on the current palette as set in Ocolor_config.palette. This is merely a lookup into the palette.
Downgrade
These functions are used to print colors in a terminal that does not support them by finding the closest. Since most terminal support 24-bits colors, these functions will be probably never used. However, in the case of a 4-bits colors only terminal, the best is to use only 4-bits colors. Indeed, the rendering can be surprising and these functions might run slowly.
val color4_of_color8 : Ocolor_types.color8 -> Ocolor_types.color4Make a 4-bits color from a 8-bits color. In the case of a greyscale or 6*6*6 cube color, it uses the palette to find the closest 4-bits color. When it is a 4-bits color, it is unchanged.
val color8_of_color24 : Ocolor_types.color24 -> Ocolor_types.color8Make a 8-bits color from a 24-bits color. Use the palette as set in Ocolor_config.palette.
val color4_of_color24 : Ocolor_types.color24 -> Ocolor_types.color4Make a 4-bits color from a 24-bits color. Use the palette as set in Ocolor_config.palette.
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