ImageMagick:将灰色提升为CMYK黑色吗? [英] ImageMagick: Promote grays to CMYK black?

问题描述

是否可以使用ImageMagick将CMYK图像(例如CMYK .tiff)的所有灰色移到黑色(K)印版中?

(在Adobe Acrobat Pro中，此功能标记为:将灰色提升为CMYK黑色")

以下是要进行实验的图像:

您可以在.

Is there a way to move all gray colors of a CMYK image (e.g. a CMYK .tiff) into the black (K) plate with ImageMagick?

(In Adobe Acrobat Pro, this functionality is labeled: "Promote grays to CMYK black")

Here's an image to experiment with:

You can view an example of this process on Wikipedia.

解决方案

Also not a full answer as such, but hopefully useful towards producing one - by Kurt, myself or others. I looked at the Photoshop method of GCR and am adding the characteristic curves that Adobe seem to use for GCR. There are 5 levels, ranging from "None", through "Light", "Medium", "Heavy" and "Full".

I presume the "Light" curve is showing that no black ink is added into the mix till it would be over 50%, and the "Medium" shows the black would have to be only 25% before any gets added, and the "Heavy" shows that only 12-15% of black is needed before black ink gets added into the mixture.

I also add the following reference to assist any other answerers... see PDF here.

这篇关于ImageMagick:将灰色提升为CMYK黑色吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！