postscript to jpeg

abhattacharya · 12-12-2007, 06:36 AM

Hello
i am using fedora 6. can any body suggest how can i convert a image postscript file to a jpeg file?
which type of software do i need?
or any specific command etc. ?
please help me out

matthewg42 · 12-12-2007, 07:13 AM

You can use gs (ghostscript). For example, if you have a postscript file called testpage-a4.ps, and want to make a jpg file with an image of the content of this file, you can do it with this command:

Code:

gs -sDEVICE=jpeg -sOutputFile=testpage-a4.jpg - < testpage-a4.ps

pwc101 · 12-12-2007, 07:46 AM

To expands upon matthewg42's command:

Code:

gs -sDEVICE=jpeg -r300 -sPAPERSIZE=a4 -dBATCH -dNOPAUSE -sOutputFile=testpage-a4.jpg testpage-a4.ps

I add the -r to specify dpi resolution, and the papersize maintains the a4 proportions, otherwise I think it'll default to letter (8" by 11"). The dBATCH and dNOPAUSE are useful for doing batches of postscripts, so that gs doesn't wait for you to hit enter. This could be used in a script as follows:

Code:

for image in ./images/*; do
   gs -sDEVICE=jpeg -r300 -sPAPERSIZE=a4 -dBATCH -dNOPAUSE \
      "-sOutputFile=${image%.ps}.jpg" "$image"
done

edit: matthewg42, is there any advantage of specifying the - in gs and redirecting the postscript file using <, rather than just specifying it as an argument in the gs command?

matthewg42 · 12-12-2007, 07:51 AM

Quote:

Originally Posted by pwc101

edit: Matthew, is there any advantage of specifying the - in gs and redirecting the postscript file using <, rather than just specifying it as an argument in the gs command?

It just prevents "showpage, press <return> to continue" messages after each page, and stops the GS> prompt from appearing after the file is processed. It is just another way to accomplish what the -dBATCH -dNOPAUSE options do.

tronayne · 12-12-2007, 08:23 AM

You already have a PostScript file? You can use ImageMagick; e.g.,

Code:

display file.ps
left click in the image
click File
click save
click Format
select jpeg or jpg
click save

osor · 12-12-2007, 10:20 AM

Quote:

Originally Posted by tronayne

You can use ImageMagick

Yes you can:

Code:

convert foo.ps foo.jpg

pwc101 · 12-12-2007, 11:50 AM

Quote:

Originally Posted by osor

Yes you can:

Code:

convert foo.ps foo.jpg

I found that the default output from this command made for dreadful quality images. I don't know how you specify a higher resolution using convert...

matthewg42 · 12-12-2007, 11:56 AM

Quote:

Originally Posted by pwc101

I found that the default output from this command made for dreadful quality images. I don't know how you specify a higher resolution using convert...

You can pass the resolution to convert using the -resample option:

Code:

convert -resample 300 file.ps file.jpg