PDF to JPEG conversion using Ghostscript

Question

I'm using Ghostscript to convert my PDF files to JPEGs with Ghostscript which works great.

For my output images I'm using %03d in the file name, so the file names come out 001, 002 ... and so on according to the page numbers.

But i want in some case the numbers to start from an higher number.

For example I process a file with two pages so the output images are page001.jpg, page002.jpg

Now I want to process another PDF and instead of replacing those files, I want to create page003.jpg, page004.jpg.

How can this be done?

This is my full command line I'm using now:

'C:\gs\gs9.14\bin \gswin64c -dNOPAUSE -sDEVICE=png16m \
  -sOutputFile=page-%03d.jpg -r100x100 -q' . $pdf_file. '-c quit'

Answer 1

Here is a workaround trick, that you could use:

gswin64c.exe                  ^
   -sDEVICE=png16m            ^
   -sOutputFile=page-%03d.jpg ^
   -r100x100                  ^
   -c "showpage showpage"     ^
   -f filename.pdf

The -c "showpage showpage" inserts two empty pages into the output. The output files will be named

page-001.jpg + page-002.jpg + page-003.jpg + page-004.jpg

So the first two are white-only JPEGs and should be deleted afterwards.

You can extend this command with any number of empty pages you want.

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Update

Of course, if you know in advance that you want to convert several different PDF files to images where you want the counting for a new PDF to continue exactly from where the last PDF ended, you could do this:

gswin64c.exe                  ^
   -sDEVICE=jpeg              ^
   -sOutputFile=page-%03d.jpg ^
   -r100x100                  ^
   -f file1.pdf               ^
   -f file2.pdf               ^
   -f file3.pdf               ^
   -f [...]

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_{BTW, your original command requests .jpg file suffixes, while the Ghostscript device is png16m. This doesn't match. Initially I blindly copied your command, but now I've corrected it.}