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I have been trying to convert a color pdf to a grayscale pdf prior to printing to avoid the color printing costs. I am using Debian and ImageMagick commands:
convert -monochrome swp574.pdf output2.pdf
convert -colorspace GRAY swp574.pdf swp574GRAY.pdf
pdf2ps swp574.pdf output2.pdf
and I get this response on the terminal each time.
File has circular references in resource dictionaries.
**** File has circular references in resource dictionaries.
**** This file had errors that were repaired or ignored.
**** Please notify the author of the software that produced this
**** file that it does not conform to Adobe's published PDF
**** specification.
How can I get over this problem?
Vass
Posted 2016-05-13T02:26:40.437
Reputation: 1 389
Please consult this - http://superuser.com/questions/104656/convert-a-pdf-to-greyscale-on-the-command-line-in-floss
– hkdtam – 2016-05-13T06:09:45.377@hkdtam, i did and used those commands, but there is a problem with the pdf internals for the correctness of the Adobe pdf formatting – Vass – 2016-05-13T14:02:27.153
thanks for your feedback, did you mean the ghostscript solution in the link cause problems? – hkdtam – 2016-05-13T16:54:05.490
@hkdtam, those commands in the question did not work and neither did the gs commands work. Something in the pdf caused the problem. – Vass – 2016-05-15T08:08:57.657
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It seems that you are dealing with some very special stuff here. If it is not a sensitive document you may try your luck at here
– hkdtam – 2016-05-15T19:51:33.310@hkdtam, tried it without any success... – Vass – 2016-05-17T09:23:53.297
Oh I see, actually the file is that broken I guess you may just save your time by reprinting it on Windows with grayscale using a PDF printer driver like pdfcreator. Just have a look on the last section of this link
– hkdtam – 2016-05-17T10:24:49.973