This enumeration allows the application and Source to identify which color data formats are available.

Values:

IG_TW_PC_CHUNKY	Chunky mode.
IG_TW_PC_PLANAR	Planar mode.

Remarks:

There are two options, "planar" and "chunky." For example, planar RGB data is transferred with the entire red plane of data first, followed by the entire green plane, followed by the entire blue plane (typical for three-pass scanners). "Chunky" mode repetitively interlaces a pixel from each plane until all the data is transferred (R-G-B-R-G-B...) (typical for one-pass scanners).