2011.04.12 02:06 "[Tiff] Libtiff v4.0.0beta7 released", by Bob Friesenhahn

2011.04.23 09:41 "Re: [Tiff] [GM-help] PDF version", by Hunter1972

> You can adjust the GraphicsMagick output by adding a gamma adjustment > step. Compare the dramatic difference between these two commands:

>    gm convert src.jpg -gamma 0.45 -monochrome -colors 2 gamma-0.45.tiff
>    gm convert src.jpg -gamma 2.6 -monochrome -colors 2 gamma-2.6.tiff

> Bob

Yes, Bob, I checked it, the difference is seen by naked eye, thank you!

Then I decided to create a colored TIFF file with JPEG compression. Gm utility ("convert -compress jpeg c:\3.jpg c:\45.tif") is finished with 1 not creating the file.

My own utility raises an exception with the message: "ImageLibExe: JPEG compression support is not configured. (c:\59.tif) reported by ..\..\coders\tiff.c:621 (TIFFErrors)"

Under debugger I found that the error is caused in tiff.c (line 4644, TIFFWriteScanline).

I had the similar problem with bmp2tif.c module from libtiff and there it was resolved by setting TIFFTAG_ROWSPERSTRIP to 8 or 16 (in command line "-r 8") Here as I see TIFFTAG_ROWSPERSTRIP is set to 16 so the problem not in it. What to do?

Ravil