2002.04.02 21:30 "RE: Monochrome Flag question", by Dwight Kelly

Is there a tag I can set to distinguish between 3 band (24 bit) monochrome, where all three bands have equivalent pixels, and 3 band color (RGB)?

True RGB would use PHOTOMETRIC_RGB. Are you saying you have a file with PHOTOMETRIC_RGB but it really contains 3 monochrome channels? Or is the file PHOTOMETRIC_MINISWHITE/PHOTOMETRIC_MINISBLACK with SAMPLESPERPIXEL = 3?

For PHOTOMETRIC_RGB, SAMPLESPERPIXEL=3: I would guess that R, G, B samples would all be the same value (R=G=B).

Dwight Kelly
Apago, Inc.
4080 McGinnis Ferry Rd Suite 601
Alpharetta, GA 30005
voice:(770) 619-1884 fax:(770) 619-1885
email: dkelly@apago.com web: http://www.apago.com