Specifies color reduction modes on image loading.

Values:

IG_LOAD_COLOR_DEFAULT	No color reduction performed.
IG_LOAD_COLOR_1	Image bit depth is reduced to 1 bit per pixel during loading.
IG_LOAD_COLOR_4	Image bit depth is reduced to 4 bits per pixel during loading.
IG_LOAD_COLOR_8	Image bit depth is reduced to 8 bits per pixel during loading.
IG_LOAD_GRAYSCALE_8	Image bit depth is reduced to 8 bits per pixel and color space converted to grayscale during loading.

Remarks:

See IG_load_color_reduction_set for more details.