Color image to B/W or RGB to CMYK

Post by MadYuv
Is this possible to turn all color images to B/W or to turn all RGB to CMYK while doing DVI2PS conversion (using dvips) or through PDFLaTeX without touching the images...pl share all your thoughts...

please help me to sortout my issue...

Leon van Dommelen

2017-04-15 14:18:17 UTC

Post by MadYuv
Is this possible to turn all color images to B/W or to turn all RGB to
CMYK while doing DVI2PS conversion (using dvips) or through PDFLaTeX
without touching the images...pl share all your thoughts...

please help me to sortout my issue...

https://www.adobe.com/products/postscript/pdfs/PLRM.pdf section 4.10
shows what postscript can do. Maybe you can implement something using
specials?

Just an idea. I would not know how to do it myself; I would just
convert the images.

Leon

MadYuv

2017-04-18 07:18:30 UTC

Post by Leon van Dommelen

Post by MadYuv
Is this possible to turn all color images to B/W or to turn all RGB to
CMYK while doing DVI2PS conversion (using dvips) or through PDFLaTeX
without touching the images...pl share all your thoughts...

please help me to sortout my issue...

https://www.adobe.com/products/postscript/pdfs/PLRM.pdf section 4.10
shows what postscript can do. Maybe you can implement something using
specials?
Just an idea. I would not know how to do it myself; I would just
convert the images.
Leon

Thanks for your update, will check and get back...

k***@gmail.com

2017-04-19 00:49:37 UTC

an answer for color images to black and white is given on TeX StackExchange:

https://tex.stackexchange.com/questions/125576/png-figures-in-black-and-white

Try: dvips -I g <filename>

the "g" stands for grayscale. regards from corporal

MadYuv

2017-04-19 04:51:46 UTC

Post by k***@gmail.com

https://tex.stackexchange.com/questions/125576/png-figures-in-black-and-white
Try: dvips -I g <filename>
the "g" stands for grayscale. regards from corporal

Following error happened if I tried with the suggestion:

dvips: ! Invalid option `-I'. Try --help for more information.

And my LaTeX code follows:

\documentclass{book}
\usepackage{color,graphicx}
\begin{document}

\begin{figure}
\centerline{\includegraphics{Color.eps}}
\end{figure}

\end{document}

I am using MikTeX Version 2.9 (Version 3.14159265-2.6-1.40.17 [MiKTeX 2.9.6210])

Please suggest what went wrong....

k***@gmail.com

2017-04-19 05:41:24 UTC

Yes, my suggestion was not correct. I tested dvips -I g <filename> after your reply and got the invalid option error message. You may need to use a graphic program to do the conversion from color to B/W (grayscale).
regards from corporal

Herbert Voss

2017-04-23 19:48:18 UTC

\documentclass{book}
\usepackage{color,graphicx}
\AtBeginDocument{\special{ps:
true setglobal globaldict begin
/setrgbcolor { 0.07 mul exch 0.71 mul add exch 0.21 mul add setgray }
def
end false setglobal
}}
\begin{document}

\includegraphics[scale=0.5]{tiger.eps}
\newpage
\includegraphics[scale=0.5]{tiger.eps}

\end{document}

With the globaldict it works only for the first image.
It needs latex->dvips->ps2pdf

Herbert

Herbert Voss

2017-04-24 07:43:41 UTC

Post by MadYuv
Is this possible to turn all color images to B/W or to turn all RGB to
CMYK while doing DVI2PS conversion (using dvips) or through PDFLaTeX
without touching the images...pl share all your thoughts...

\documentclass{book}
\usepackage{color,graphicx}
true setglobal globaldict begin
/setrgbcolor { 0.07 mul exch 0.71 mul add exch 0.21 mul add setgray } def
end false setglobal
}}
\begin{document}
\includegraphics[scale=0.5]{tiger.eps}
\newpage
\includegraphics[scale=0.5]{tiger.eps}
\end{document}
With the globaldict it works only for the first image.

read "without" ...

Herbert

Post by MadYuv
It needs latex->dvips->ps2pdf

MadYuv

2017-04-27 07:27:23 UTC

Post by MadYuv
Is this possible to turn all color images to B/W or to turn all RGB to
CMYK while doing DVI2PS conversion (using dvips) or through PDFLaTeX
without touching the images...pl share all your thoughts...

read "without" ...
Herbert

Post by MadYuv
It needs latex->dvips->ps2pdf

Sorry, I didn't check the suggestion, hence I was not well for the past days, still the color images didn't change to B/W, my coding follow:

\documentclass{book}
\usepackage{color,graphicx}
\AtBeginDocument{\special{ps:
true setglobal globaldict begin
/setrgbcolor { 0.07 mul exch 0.71 mul add exch 0.21 mul add setgray }
def
end false setglobal
}}
\begin{document}

\begin{figure}
\centerline{\includegraphics{colorrgbmake.eps}}
\end{figure}

\clearpage

\begin{figure}
\centerline{\includegraphics{colorrgbmake.eps}}
\end{figure}

\end{document}

dvips filename.dvi
ps2pdf filename.ps

Herbert Voss

2017-04-27 07:30:48 UTC

Post by MadYuv
\centerline{\includegraphics{colorrgbmake.eps}}

can you provide that eps for a test?

Herbert

MadYuv

2017-04-27 08:38:41 UTC

Post by MadYuv
\centerline{\includegraphics{colorrgbmake.eps}}

can you provide that eps for a test?
Herbert

Sent to your mail...

Herbert Voss

2017-04-27 09:45:15 UTC

Post by MadYuv
\centerline{\includegraphics{colorrgbmake.eps}}

can you provide that eps for a test?

The problem is the figure environment, it doesn't use the
global definitions. Set the gray conversion also inside
that environment. You can redefinie the figure environment
that it does it by default.

this works:

\documentclass{book}
\usepackage{graphicx}
\def\setGray{\special{ps:
true setglobal globaldict begin
/setrgbcolor { 0.07 mul exch 0.71 mul add exch 0.21 mul add setgray
} def
end false setglobal
}}
\AtBeginDocument{\setGray}
\begin{document}
\begin{figure}
\setGray
\centerline{\includegraphics{colorrgbmake2.eps}}
\end{figure}

\clearpage

\begin{figure}
\setGray
\centerline{\includegraphics{colorrgbmake2.eps}}
\end{figure}

\end{document}

Herbert

s***@gmail.com

2017-04-27 12:54:05 UTC

Post by MadYuv
\centerline{\includegraphics{colorrgbmake.eps}}

can you provide that eps for a test?

The problem is the figure environment, it doesn't use the
global definitions. Set the gray conversion also inside
that environment. You can redefinie the figure environment
that it does it by default.
\documentclass{book}
\usepackage{graphicx}
true setglobal globaldict begin
/setrgbcolor { 0.07 mul exch 0.71 mul add exch 0.21 mul add setgray } def
end false setglobal
}}
\AtBeginDocument{\setGray}
\begin{document}
\begin{figure}
\setGray
\centerline{\includegraphics{colorrgbmake2.eps}}
\end{figure}
\clearpage
\begin{figure}
\setGray
\centerline{\includegraphics{colorrgbmake2.eps}}
\end{figure}
\end{document}
Herbert

It works fine, thanks a lot for your great help....

Axel Berger

2017-04-27 17:23:18 UTC

Post by s***@gmail.com
It works fine, thanks a lot for your great help....

Just a rough outline of the way I tend to go about these things in the
hope, someone might find it useful:

Run an editor script over the logfile to extract all images loaded and
make that list into a batch command file.
Then run that batch to repeatedly call up a graphics program to alter
the images as needed and save them in a separate directory.
Last set \graphicspath to look in that directory first.

I use it often, if not for your task specifically. If that sounds too
complicated then take a look at the package pdflatexpicscale by Peter
Willadt.
Contrary to my proprietary solution it conforms to LaTeX standards but
it's less flexible and you'd probably need the author's help to adapt it
to your needs.

Axel

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s***@gmail.com

2017-05-04 10:34:00 UTC