将PDF转换为CMYK，但忽略黑色吗? [英] Convert PDF to CMYK but ignore black?

问题描述

我正在使用以下命令将RGB PDF转换为CMYK:

I am converting an RGB PDF to CMYK using the following command:

/usr/local/bin/gs -dSAFER -dBATCH -dNOPAUSE -dNOCACHE -sDEVICE=pdfwrite \ 
-sColorConversionStrategy=CMYK -sColorConversionStrategyForImages=CMYK \
-dProcessColorModel=/DeviceCMYK -dEncodeColorImages=false \
-dEncodeGrayImages=false -dEncodeMonoImages=false -sOutputFile=CMYK.PDF RGB.PDF

生成的文件为100％CMYK，但是现在RGB PDF中所有100％黑色的文件如下:

The resulting file is 100% CMYK, however anything that was 100% black in the RGB PDF is now:

C: 72%
M: 68%
Y: 67%
K: 89%

结果是黑色在实际上应该是黑色的情况下略带深灰色.

The result is that black is a slightly dark grey when really it should be black.

此命令是否需要添加任何内容以确保黑色在转换过程中保持黑色状态?

Is there anything I need to add to this command to ensure black remains as black during the conversion?

推荐答案

在当前版本的pdfwrite中，您只能使用软件中的颜色转换功能，因此您无能为力.

With the current version of pdfwrite you are restricted to the colour conversions in the software, and there is nothign you can do about this.

颜色管理正在进行认真修订，下一个发行版应该可以解决这个问题.

The colour management is undergoing serious revision, and the next release should make it possible to deal with this.

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