Re: [Groff] groff Image Formats

[Larry Kollar]

Frank Jahnke wrote:

> What image formats can be used with groff?  To date, I have used
> encapsulated Postscript (.eps) and PSPIC with the -ms macro  
> package, but
> I am having increasing difficulty doing the conversion of some complex
> images to eps.  Are there alternatives that can be used,
> like .png, .ps, .jpg or others?

As far as I've been able to tell, all graphics are either EPS or (in  
the case of -mwww's .PIMG macro) become EPS. I'd love to find out  
different though!

I wrote a shell script to convert PNG files to EPS. This version uses  
"sips" (an OSX-specific image processing program) to determine image  
width, but could be modified easily enough to use PBMtools or  
ImageMagick.

------------------begin------------------
#! /bin/sh

for i in $@ ; {

        fn=`basename $i .png`

        sips -g all $i | awk -v fn=$i -v ff=$fn '

                # we dont need all these props, but keep them for  
future reference
                /pixelHeight/ { dh = $2; }
                /pixelWidth/  { dw = $2; }
                /dpiHeight/   { rh = $2; }
                /dpiWidth/    { rw = $2; }

                END {
                        # set DPI to fit in 4.75i
                        scale =  
0.06;                                   # 1200 dpi
                        if( dw <= 4275 ) scale = 0.08;  #  900 dpi
                        if( dw <= 2850 ) scale = 0.12;  #  600 dpi
                        if( dw <= 2137 ) scale = 0.16;  #  450 dpi
                        if( dw <= 1425 ) scale = 0.24;  #  300 dpi
                        if( dw <= 950 )  scale = 0.36;  #  200 dpi
                        if( dw <= 713 )  scale = 0.48;  #  150 dpi
                        if( dw <= 475 )  scale = 0.72;  #  100 dpi
                        if( dw <= 342 )  scale = 1.0;   #   72 dpi

                        cmd = "pngtopnm " fn " | pnmtops -noturn - 
scale=" scale " >" ff ".eps";
                        print cmd;
                        system( cmd );
                }
                '
}
-----------------end-----------------

-- Larry