MobileRead Forums - View Single Post - How to prevent cover being replaced when sending book to device?

GeoffR · 04-09-2015, 04:41 AM

I have an epub with a PNG cover image. When I import the book into Calibre, the cover gets converted to JPG and stored in the Calibre library. Then when I send the book to my device (or save to disk), it seems that Calibre converts its JPG cover into PNG and uses that to replace the original cover in the epub.

This means there is a PNG --> JPG --> PNG conversion taking place for every book with a PNG cover, resulting in a loss of image quality.

How can I prevent Calibre replacing the original PNG cover with the JPG cover kept in the Calibre library?

Alternatively, is there a way to prevent Calibre converting the cover to JPG in the first place?

04-09-2015, 04:41 AM	#1
GeoffR Wizard Posts: 3,821 Karma: 19162882 Join Date: Nov 2012 Location: Te Riu-a-Māui Device: Kobo Glo	How to prevent cover being replaced when sending book to device? I have an epub with a PNG cover image. When I import the book into Calibre, the cover gets converted to JPG and stored in the Calibre library. Then when I send the book to my device (or save to disk), it seems that Calibre converts its JPG cover into PNG and uses that to replace the original cover in the epub. This means there is a PNG --> JPG --> PNG conversion taking place for every book with a PNG cover, resulting in a loss of image quality. How can I prevent Calibre replacing the original PNG cover with the JPG cover kept in the Calibre library? Alternatively, is there a way to prevent Calibre converting the cover to JPG in the first place?