Bit works internally in RGB space, which is split into
packed pixel representation and color index (CI) representation
depending on the input image. Type conversions between
packed pixel and CI are typically transparant and need no
user interation. Grayscale images can exist either in
packed pixel representation or CI representation. Black & White
images, however, only exist in CI format.
RGB primaries are currently represented by unsigned char
and consequently only 8bits of resolution. However, direct use
of unsigned char is strongly discouraged, instead,
use the new type pc_t for primary color varaibles
and resolution of which can be determined form PCBITS
and PCMAX.
Subsections