2002.07.10 20:11 "Re: YCCK photometric?", by Chris Cox

I know it's possible to compress a RGB image using JPEG compression and YCrCb colorspace using COMPRESSION_JPEG & PHOTOMETRIC_YCBCR.

Is it possible to compress a CMYK image in a TIFF using JPEG compression and YCCK colorspace?

No.

The recently published Adobe Photoshop TIFF Technote indicates that the photometric must matched the jpeg compressed data so YCCK can't be used.

That is correct - YCCK is not valid in TIFF.

And the technote for JPEG in TIFF that covers that restriction is quite old...

Chris