We are evaluating your software in order to convert a gray scale pdf image to mono G4 tiff

We are evaluating your software in order to convert a gray scale pdf image to mono G4 tiff.
I tried the command line:

pdf2img -r 300 - compress 4 -mono -multipage Infile Outfile

The original file is 12 pages gray scale. The process takes 5-7 seconds on a 16 core server. The main issue is that the resulting tif has an unacceptable level of dithering.

Do you have any suggestions?
Customer
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Please use -threshold option to try again, for example,

pdf2img.exe -r 300 -threshold 180 -multipage test3.pdf _pdf2bw_threshold.tif
pdf2img.exe -r 300 -threshold 180 test3.pdf _pdf2bw_out.png

This is original PDF file,

image

The following image was created by following command line,

pdf2img.exe -r 300 -mono test3.pdf _pdf2bw_mono.png

image

The following image was created by following command line, the resultant TIFF file is a multi-page TIFF file,

pdf2img.exe -r 300 -threshold 180 -multipage test3.pdf _pdf2bw_threshold.tif

image

The following image was created by following command line,

pdf2img.exe -r 300 -threshold 180 test3.pdf _pdf2bw_out.png

image

If you still have same problem, please send to us your sample PDF file, we will check your PDF file and figure out a best command line to you asap.

VeryPDF

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