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Imagemagick 6.7.7 conversion from rgb pdf to cmyk pdf looks dark
Posted: 2015-05-27T23:02:28-07:00
by triveni
I am using Imagemagick 6.7.7 on ubuntu 14.04.2 ,I am converting a rgb pdf to cmyk pdf it looks dark but it is working fine on Imagemagick 6.6.6. I am using below command.
convert tp_rgb.pdf -verbose -density 300 -colorspace CMYK tp_cmyk.pdf
How can we fix that,can any help me on this.
Thanks
Re: Imagemagick 6.7.7 conversion from rgb pdf to cmyk pdf looks dark
Posted: 2015-05-27T23:22:00-07:00
by snibgo
That is a very old version of IM. I suggest you upgrade. Also upgrade Ghostscript.
At that time, IM was a bit confused about linear and non-linear colorspaces. For that version, one of these might cure the problem:
Code: Select all
convert tp_rgb.pdf -verbose -density 300 -evaluate Pow 2.2 -colorspace CMYK tp_cmyk.pdf
... or ...
Code: Select all
convert tp_rgb.pdf -verbose -density 300 -evaluate Pow 0.454545 -colorspace CMYK tp_cmyk.pdf
Re: Imagemagick 6.7.7 conversion from rgb pdf to cmyk pdf looks dark
Posted: 2015-05-28T06:43:41-07:00
by triveni
yes it seems to be working thanks but still checking..
Re: Imagemagick 6.7.7 conversion from rgb pdf to cmyk pdf looks dark
Posted: 2015-05-28T09:54:21-07:00
by fmw42
IM was undergoing some major changes in the range of 6.7.7 and everything was not worked out until later. See
viewtopic.php?f=4&t=21269