AWARE SYSTEMS
TIFF and LibTiff Mail List Archive

Thread

2002.06.20 16:25 "Photoshop 7 TIFF Jpeg compressed.", by Bruno LEDOUX
2002.07.03 13:26 "Photometric interpretation for grey-scale JPEG", by Jon Saxton
2002.07.04 05:13 "Re: Photometric interpretation for grey-scale JPEG", by Tom Lane
2002.07.04 16:01 "Re: Photometric interpretation for grey-scale JPEG", by Jon Saxton
2002.07.04 17:40 "Re: Photometric interpretation for grey-scale JPEG", by Tom Lane
2002.07.05 00:24 "Re: Photometric interpretation for grey-scale JPEG", by Jon Saxton
2002.07.05 01:23 "Re: Photometric interpretation for grey-scale JPEG", by Tom Lane

2002.07.04 05:13 "Re: Photometric interpretation for grey-scale JPEG", by Tom Lane

Is this correct? If so, then should 6 be an acceptable PI for grey JPEG-in-TIFF?

Absolutely NOT, imho. 1 (MINISBLACK) is correct for grayscale JPEGs.

The fact that you came across some cluelessly encoded TIFFs is not grounds for breaking such basic assumptions as that PhotometricInterpretation has something to do with the colorspace of the stored data.

The only reason TTN#2 doesn't spell this out in so many words is that it never occurred to me that anyone might think otherwise.

                        regards, tom lane
                        organizer, Independent JPEG Group