Conversion to jpeg/png

[Fallingwater]

Is there any way (a plugin, I suppose) to get Calibre to convert an ebook into a series of jpegs of a specified resolution, for visualization on devices that can display pictures but not text?

[Adoby]

If you first convert the book to pdf, using calibre, then you can easily convert that pdf to a series of jpg images. There are free programs and even free online services for that.

Just google "pdf to jpg".

[dwig]

One way may be to use one of the many "print to bitmap" virtual printer drivers. These install as a printer but print to file rather than print to a device. I don't have experience with any other than one that prints to PDF (PrimoPDF), but there are a number out there that output JPEG and other bitmap formats.

With a virtual printer you simply get the ebook into a format that works in some ebook viewing software that has a standard print function. It's then an issue of adjusting the viewer's layout to size the print "pages" as needed and then adjusting the virtual printer to produce the needed resolution.

[Sabardeyn]

I've been away from these forums for awhile and therefore might be incorrect. That said...

I'm not aware of an option to bulk convert text (or other on-demand vector-based data) into graphic images within calibre.

It seems like you're trying to automate and simplify the process of converting vector data to raster (bit-mapped) data. At least as far as I know, there is no good way to do so. (Automatic bulk conversion of existing images is possible through graphics programs and some utilities. Most of these programs require a compatible image source format which isn't likely to be available for ebooks.)

[MarvRod]

Is there any way (a plugin, I suppose) to get Calibre to convert an ebook into a series of jpegs of a specified resolution, for visualization on devices that can display pictures but not text?
If you want to convert an eBook into a series of JPEG or PNG format, then you should try some online PDF to image converter applications. Other than this you can also try some third-party applications which can help you convert your PDF files into JPEG or PNG format. I can suggest you to check SysInfoTools PDF Image Extractor software that will extract all the images and pictures from PDF files and save them to these image formats: JPEG, BMP, PNG and GIF. You can try its free demo version to check its performance.
Regards.