[sgreig]

I've been successfully creating epubs from cbc files, but today I experienced a problem with one. I tried converting them from CBR to CBZ and then recreating the CBC, I've double checked the filenames in the comics.txt file for typos, and everything should work, but for some reason the conversion aborts with this error:

ERROR: Conversion Error: <b>Failed</b>: Convert book 1 of 1 (Marvel Zombies Army Of Darkness)

Convert book 1 of 1 (Marvel Zombies Army Of Darkness)
Resolved conversion options
calibre version: 0.7.15
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': 'left',
'chapter': None,
'chapter_mark': u'pagebreak',
'colors': 256,
'comments': None,
'cover': None,
'debug_pipeline': None,
'despeckle': False,
'disable_font_rescaling': True,
'disable_trim': False,
'dont_grayscale': True,
'dont_normalize': False,
'dont_sharpen': False,
'dont_split_on_page_breaks': False,
'extra_css': None,
'extract_to': None,
'flow_size': 260,
'font_size_mapping': None,
'footer_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'header_regex': u'(?i)(?<=<hr>)((\\s*<a name=\\d+></a>((<img.+?>)*<br>\\s*)?\\d+<br>\\s*.*?\\s*)|(\\s* <a name=\\d+></a>((<img.+?>)*<br>\\s*)?.*?<br>\\s*\\d+))(?=<br>)' ,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x90191ac>,
'insert_blank_line': False,
'insert_metadata': False,
'isbn': None,
'keep_aspect_ratio': False,
'keep_ligatures': False,
'landscape': False,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 0,
'margin_left': 0,
'margin_right': 0,
'margin_top': 0,
'max_toc_links': 50,
'no_chapters_in_toc': False,
'no_default_epub_cover': False,
'no_inline_navbars': False,
'no_process': False,
'no_sort': False,
'no_svg_cover': False,
'output_format': u'png',
'output_profile': <calibre.customize.profiles.iPadOutput object at 0x90198cc>,
'page_breaks_before': None,
'prefer_metadata_cover': False,
'preprocess_html': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': True,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': '/tmp/calibre_0.7.15_JN9K5H.opf',
'remove_first_image': False,
'remove_footer': False,
'remove_header': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'right2left': False,
'series': None,
'series_index': None,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'use_auto_toc': False,
'verbose': 2,
'wide': False}
InputFormatPlugin: Comic Input running
on /home/scott/CalibreLibrary/John Layman/Marvel Zombies Army Of Darkness (190)/Marvel Zombies Army Of Darkness - John Layman.cbc
Found comic pages...
Marvel Zombies vs Army of Darkness 01 - page 01.jpg
Marvel Zombies vs Army of Darkness 01 - page 02.jpg
Marvel Zombies vs Army of Darkness 01 - page 03.jpg
Marvel Zombies vs Army of Darkness 01 - page 04.jpg
Marvel Zombies vs Army of Darkness 01 - page 05.jpg
Marvel Zombies vs Army of Darkness 01 - page 06.jpg
Marvel Zombies vs Army of Darkness 01 - page 07.jpg
Marvel Zombies vs Army of Darkness 01 - page 08.jpg
Marvel Zombies vs Army of Darkness 01 - page 09.jpg
Marvel Zombies vs Army of Darkness 01 - page 10.jpg
Marvel Zombies vs Army of Darkness 01 - page 11.jpg
Marvel Zombies vs Army of Darkness 01 - page 12.jpg
Marvel Zombies vs Army of Darkness 01 - page 13.jpg
Marvel Zombies vs Army of Darkness 01 - page 14.jpg
Marvel Zombies vs Army of Darkness 01 - page 15.jpg
Marvel Zombies vs Army of Darkness 01 - page 16.jpg
Marvel Zombies vs Army of Darkness 01 - page 17.jpg
Marvel Zombies vs Army of Darkness 01 - page 18.jpg
Marvel Zombies vs Army of Darkness 01 - page 19.jpg
Marvel Zombies vs Army of Darkness 01 - page 20.jpg
Marvel Zombies vs Army of Darkness 01 - page 21.jpg
Marvel Zombies vs Army of Darkness 01 - page 22.jpg
Marvel Zombies vs Army of Darkness 01 - page 23.jpg
Xpuckinfl tribute tag.jpg
zTeam-DCP.jpg
Found comic pages...
Cover_MZvAD2.jpg
Page01_MZvAD2.jpg
Page02_MZvAD2.jpg
Page03_MZvAD2.jpg
Page04_MZvAD2.jpg
Page05_MZvAD2.jpg
Page06_MZvAD2.jpg
Page07_08_MZvAD2.jpg
Page09_MZvAD2.jpg
Page10_MZvAD2.jpg
Page11_MZvAD2.jpg
Page12_MZvAD2.jpg
Page13_MZvAD2.jpg
Page14_MZvAD2.jpg
Page15_MZvAD2.jpg
Page16_MZvAD2.jpg
Page17_MZvAD2.jpg
Page18_MZvAD2.jpg
Page19_MZvAD2.jpg
Page20_MZvAD2.jpg
Page21_MZvAD2.jpg
Page22_MZvAD2.jpg
scansig.gif
Traceback (most recent call last):
File "/tmp/init.py", line 48, in <module>
File "/home/kovid/build/calibre/src/calibre/utils/ipc/worker.py", line 99, in main
File "/home/kovid/build/calibre/src/calibre/gui2/convert/gui_conversion.py", line 24, in gui_convert
File "/home/kovid/build/calibre/src/calibre/ebooks/conversion/plumber.py", line 815, in run
File "/home/kovid/build/calibre/src/calibre/customize/conversion.py", line 211, in __call__
File "/home/kovid/build/calibre/src/calibre/ebooks/comic/input.py", line 398, in convert
File "/home/kovid/build/calibre/src/calibre/ebooks/comic/input.py", line 362, in get_pages
File "/home/kovid/build/calibre/src/calibre/ebooks/comic/input.py", line 240, in process_pages
Exception: Failed to process comic:

loader: coders/png.c:6750: WriteOnePNGImage: Assertion `number_colors <= 256' failed.
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page13_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page14_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page15_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page16_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page17_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page18_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page19_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page20_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page21_MZvAD2.jpg
Rendered /tmp/calibre_0.7.15_SiDHTZ_comic_extract/Page22_MZvAD2.jpg
Aborted

Any ideas as to the problem and how to resolve it?

EDIT: Apparently if I turn off comic processing it works just fine. I wonder why it's not working the other way though.