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D
dhishok
Known Participant
December 13, 2011
Question

LAB color to BW conversion

  • December 13, 2011
  • 2 replies
  • 1645 views

Hi,

Can anyone suggest me the algorithm of converting LAB color to Greyscale (Black & White).

For example,

L = 67 A = -5 B = -30 (i.e. equivalent to C=50 M=25 Y=0 K=0) need to be changed as  44% of black.

Thanks in advance.

Thiyagu

This topic has been closed for replies.

2 replies

Harbs.
Harbs.
Legend
December 13, 2011

You can check out my blog post here:

http://in-tools.com/article/scripts-blog/convert-colors-to-grayscal-in-indesign/

D
dhishokAuthor
Known Participant
December 15, 2011

Hi Uwe,

Thanks for your comments. I will try the possibilities.

L
Community Expert
LaubenderCommunity Expert
Community Expert
December 13, 2011

Thiyagu,

that is no easy task.

If you use ICC color management, it totally depends on your printing conditions on press to get the "right" numbers.

You could configure color management for greyscale in PhotoShop to do the conversion handing over lab numbers from InDesign scripting through BridgeTalk and getting back a greyscale number which you can take for the black channel in InDesign.

InDesign is not capable of working with color-to-greyscale convertions.

Uwe

rob day
Community Expert
rob dayCommunity Expert
Community Expert
December 15, 2011

InDesign is not capable of working with color-to-greyscale convertions.

It is possible to make a color managed conversion to the CMYK black plate. If you use OSX try the AppleScript I posted at Harbs blog—see the readme you'll need to install the enclosed profiles before running the script:

http://www.zenodesign.com/forum/IDConvertAllToGS.zip

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