1994.08.26 18:01 "tiffdither inserts noise", by Uwe Bonnes

After tiffdither, a grayscale image with some black lines on a white background has noise random distributed all over the image. I can adjust the threshold, the lower I set the threshold, the less noise I get, but it is always there in some (unacceptable) degree. Am I doing somthing wrong? As the original data I want to process is a B/W-postscript-File I would request a function "pbm2tiff" to avoid the necessarity of going the way ps --> ppm --> ppm2tiff --> tiff2bw --> tiffdither.

Uwe Bonnes bon@lte.e-technik.uni-erlangen.de