imRGB2Gray

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
version(IM)
extern (C) @nogc nothrow
void
imRGB2Gray
(
int width
,
int height
,
ubyte* red
,
ubyte* green
,
ubyte* blue
,
ubyte* map
,
c_long* grays
)

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