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2006.12.05 21:30 "Re: Grayscale, or is it?", by Joris Van Damme
Edward, Edward Lam wrote: > Joris wrote: > > So that's three out of three in favor of option 1), and confirming > > option 1) is common practice. > > For the record, I don't use LibTiff's RGBA interface (ie. use > TIFFReadEncodedStrip() or TIFFReadEncodedTile() instead) so I should > probably abstain from voting. :) None of your previous comments were public, so I didn't actually include you in the count. I did include myself, hence that number three, even though I used to prefer option 3) before, because I got convinced option 3) has little basis. Nonetheless... You don't need to use LibTiff's RGBA interface to explicitely or implicitely have an opinion. Just answer this question: when you read 8bit MinIsBlack greyscale (Photometric 1, otherwise known as BlackIsZero and PHOTOMETRIC_MINISBLACK) from TIFF, in order to display on a normal sRGB monitor, do you do any non-lineair conversion in between decoding and display, or do you just set the R, G, and B values directly with the greyscale values as read from the TIFF file? Best regards, Joris Van Damme info@awaresystems.be http://www.awaresystems.be/ Download your free TIFF tag viewer for windows here: http://www.awaresystems.be/imaging/tiff/astifftagviewer.html