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I've downloaded some files from the Internet Archive. They come in different file formats and most of the time I use PDF. However, sometimes the scans are saved in colour instead of black & white. This makes it difficult (or impossible) to read on a dedicated e-book reader. In that case I downloaded the DjVu files, as on the PC you can select which layer (colour, bw, foreground, background) one would like to see.
Selecting black & white gives excellent results. However, the e-book reader does not have this option.
The question is, how can I remove or extract a layer from the DjVu file and save only this layer?
So far I've tried the following two approaches:
Select black & white in the DjVu viewer on the PC and print to a PostScript file. Followed by a
ps2pdf
conversion. This works, but generates a fairly large PDF file. Sure, I can again upload it to any2DjVu but it just seems to much manual work for each file.I tried the shared annotation feature and said "mode bw". This works on the PC as desired but is ignored on the e-book reader as the other layers are still present.
Thank you for pointing me in the right direction. It looks promising but I get an error. I will read the man pages to the commands you've provided and will see what I've done wrong. – Jon – 2011-01-11T18:14:14.723