to TIFF or not to TIFF? in PressBooks

[jackdrty]

A publisher asked me to produce a camera-ready black & white PDF edition of my book in our self-hosted PressBooks site, for them to sell print editions. The problem was that they asked me to upload black & white TIFF images, which they had created from my original JPG images.

In my experience, WordPress/PressBooks is not designed to upload or display TIFF images. But after experimenting with the Enhanced Media Library plugin (which allows TIFFs to be uploaded, though not displayed), I was able to export a PDF book, but with limitations:

- TIFF images only appear in the Austen theme (not other standard PressBooks themes, such as Clarke, Luther, etc.) and only in PDF export (not in the visual editor, web edition, or epub/mobi exports)

- captions do not appear under TIFF images

So I created a TestBook to explain the issue to my publisher and asked them to compare output of a 1MB TIFF black and white image (#1) versus the same image in 500MB JPG format, which anyone can view at: 

https://www.dropbox.com/s/a3xderd5l7jy5wc/TestbookTIFF-2014-11-13.pdf?dl=0

Two questions:

1) Does anyone see any significant differences between the TIFF vs JPG images in the testbook? (In my non-professional eyes, I don't see any.)

2) If the TIFF output is higher quality, do any Pressbooks users have advice on ways of dealing with TIFF images? Or is this a dead end?

thanks

Jack

[Hugh McGuire]

We have not had any problems with our pressbooks.com users printing JPG images.

Depending on how you have Prince configured, you might have lower DPI settings ... which you can force either somewhere in the Prince config, or, in CSS as follows: 

img {

prince-image-resolution: 300dpi;

}

see: 

http://www.princexml.com/doc/properties/prince-image-resolution/ 

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[Hugh McGuire]

also note, what you see in the PDF doesn't always correspond with what you see in the printed version. for instance, sometimes images look fuzzy in PDF that come out fine in print.

[jackdrty]

Thanks, all. The publisher is pleased with the quality of the JPG photos in the PDF testbook. I'll also explore the resolution issue further.