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A
Anonymous
August 23, 2013
Question

PNG colorspace conversion

  • August 23, 2013
  • 2 replies
  • 2010 views

How can I convert PNG images so they have a colorspace of /DeviceGray not /DeviceRGB? I have tried in both fireworks and photoshop but neither appear to give a true /DeviceGray setcolorspace instead they give a /DeviceRGB setcolorspace

This are read by our XEROX color printer as a color document and costs 10 times the amount to the business.

This topic has been closed for replies.

2 replies

Dov Isaacs
Dov Isaacs
Legend
August 23, 2013

I don't know what version of Photoshop you are using, but it certainly is possible to create a true grayscale PNG file without a profile. Just did so in a few seconds.

          - Dov

- Dov Isaacs, former Adobe Principal Scientist (April 30, 1990 - May 30, 2021)
A
Anonymous
August 27, 2013

Dov,

I've tried a couple of times in Photoshop CS5 but when the images are added to the PS file they still show as RGB not Gray.

Anymore information or help to acheive true grayscale is appreciated.

Regards,

Mark

T
Test Screen Name
Legend
August 27, 2013

How did you get the PNG into the PostScript file?

H
Helge Blischke
Participating Frequently
August 23, 2013

In case you are using CUPS as your printing system, see

http://sourceforge.net/projects/cupsaddons/files/filter-colorfilter/

for a filter that converts e.g. /DeviceRGB to /DeviceGray if the

R, G, and B components are nearly equal.

As the filter is written in Perl, it is quite easy to modify it to function

as a standalone utility.

Helge

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