No glyph available error and cannot compress png images

crouton · 01-06-2017, 11:28 AM

Sorry for combining two problems but figured this was better than 2 threads.

Issue 1: When editing some books and using "subset all fonts" I get an error "no glyph available" but the error diagnostic info does not tell me which font does not have a glyph available. Any way to find this out?

Issue 2: When editing any book with png files for images and choosing the compress images losslessly option there are 10-12 processes open for OptiPNG and they all get stuck. The only way to get through this edit process is to randomly force quit some of the optipng processes. The processes all run at 90-100% of my CPU. Books which have jpg images do not have this problem. I have quite a few books that are full of images (cookbooks) which are presented in PNG, sometimes there are over 200 png images sometimes less than 50. If I force quit the processes I have to go through randomly and find the files that were not compressed and then resize manually. Any way to fix this?

Using OS X El Capitan and latest version of Calibre (no updates available)

Thank you

kovidgoyal · 01-06-2017, 10:02 PM

1. No there isn't, those warnings come from HTML rendering library (Qt WebKit) calibre uses.

2. optipng can be slow, just wait for it to complete. optipng works by basically redoing the compression on the PNG fiels repeatedly trying different paramemter values.

01-06-2017, 11:28 AM	#1
crouton Try me on salads! Posts: 25 Karma: 87656 Join Date: Sep 2013 Device: kindle keyboard	No glyph available error and cannot compress png images Sorry for combining two problems but figured this was better than 2 threads. Issue 1: When editing some books and using "subset all fonts" I get an error "no glyph available" but the error diagnostic info does not tell me which font does not have a glyph available. Any way to find this out? Issue 2: When editing any book with png files for images and choosing the compress images losslessly option there are 10-12 processes open for OptiPNG and they all get stuck. The only way to get through this edit process is to randomly force quit some of the optipng processes. The processes all run at 90-100% of my CPU. Books which have jpg images do not have this problem. I have quite a few books that are full of images (cookbooks) which are presented in PNG, sometimes there are over 200 png images sometimes less than 50. If I force quit the processes I have to go through randomly and find the files that were not compressed and then resize manually. Any way to fix this? Using OS X El Capitan and latest version of Calibre (no updates available) Thank you

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Patch PNG images in Kobo firmware	pipcat	Kobo Developer's Corner	11	06-14-2016 05:57 PM
Compress Data Base error on GloHD	mconh	Devices	3	11-09-2015 05:53 PM
PNG Images in ePUB Files not rendered on Kobo	DragonflyKing	ePub	12	10-12-2013 08:28 PM
ERROR: ... .png	saytionne	ePub	17	10-04-2010 07:13 PM
where to get autorun.xml, icon.png, key.png, lut.bin for PRS-505	obender	Sony Reader Dev Corner	2	01-25-2009 03:20 PM

01-06-2017, 10:02 PM	#2
kovidgoyal creator of calibre Posts: 43,866 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	1. No there isn't, those warnings come from HTML rendering library (Qt WebKit) calibre uses. 2. optipng can be slow, just wait for it to complete. optipng works by basically redoing the compression on the PNG fiels repeatedly trying different paramemter values.

Advert