2004.09.28 21:09 "[Tiff] TIFFTAG_PREDICTOR", by Ian Ameline

2004.09.28 22:02 "Re: [Tiff] TIFFTAG_PREDICTOR", by Chris Cox

In the docs at;


There is the strong implication that the predictor only does anything when using LZW compression. Can someone here answer the question; What compression schemes is the predictor enabled? (Breakpointing the predictor code and running shows that it works for ADOBE_DEFLATE, and for my images, this is a good thing -- they compress better with the predictor on).

Technically, it should be available for any compression - because it shouldn't be related to the compression. Practically, it only makes sense for LZW and FLATE compression.

Perhaps the documentation at the page referenced above should be updated to accurately reflect which compression schemes the predictor supports.

Again, the predictor is not related to the compression scheme. They are two separate stages in the TIFF pipeline.