Cover images increase in size when sending/saving books.

GeoffR · 06-25-2013, 07:14 AM

I noticed that .epub files are much larger after I have sent them to my device or saved them to a directory than they were originally.

The reason seems to be that the cover image files inside the epubs are inceasing in size as they are sent/saved.

I have my output profile set to Tablet, and image pixel size does not change, but the file size is often about double the original size. I think this must mean that Calibre is increasing the quality level of the image as the epub is sent/saved.

If that is the case, how can I stop it happening?

kovidgoyal · 06-25-2013, 07:34 AM

It means that the cover is being replaced by whatever cover is present in calibre. Reduce the size of that image if you want to.

GeoffR · 06-25-2013, 07:50 AM

Thanks Kovid that explains it, I didn't realise the cover in the book got replaced with the one in Calibre when the book is sent.

06-25-2013, 07:14 AM	#1
GeoffR Wizard Posts: 3,821 Karma: 19162882 Join Date: Nov 2012 Location: Te Riu-a-Māui Device: Kobo Glo	Cover images increase in size when sending/saving books. I noticed that .epub files are much larger after I have sent them to my device or saved them to a directory than they were originally. The reason seems to be that the cover image files inside the epubs are inceasing in size as they are sent/saved. I have my output profile set to Tablet, and image pixel size does not change, but the file size is often about double the original size. I think this must mean that Calibre is increasing the quality level of the image as the epub is sent/saved. If that is the case, how can I stop it happening? Last edited by GeoffR; 06-25-2013 at 07:17 AM. Reason: Calibre 0.9.36 on Linux

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06-25-2013, 07:34 AM	#2
kovidgoyal creator of calibre Posts: 45,610 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It means that the cover is being replaced by whatever cover is present in calibre. Reduce the size of that image if you want to.

06-25-2013, 07:50 AM	#3
GeoffR Wizard Posts: 3,821 Karma: 19162882 Join Date: Nov 2012 Location: Te Riu-a-Māui Device: Kobo Glo	Thanks Kovid that explains it, I didn't realise the cover in the book got replaced with the one in Calibre when the book is sent.

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