Sense of the pixel whose numeric value is zero (minimum data value).
Sources may prefer a different value depending on ICAP_PIXELTYPE. Set ICAP_PIXELTYPE and do a CapGetDefault() to determine the Source's preferences.
Integer
TWPF_CHOCOLATE(0)
TWPF_CHOCOLATE(0), TWPF_VANILLA(1)
TW_ENUMERATION, TW_ONEVALUE
TW_ONEVALUE
ICAP_PIXELTYPE