Conversion of comics (CBR/CBZ) - Page 18

theducks · 12-08-2011, 01:57 PM

Quote:

Originally Posted by ilovejedd

Question, where do I find this in Preferences?

under Conversion:
Common options: page setup tab

ChaosTwin · 08-27-2012, 03:14 AM

What's the best profile for a cbz to epub conversion for an iRiver Story HD with a resolution of 768x1024?

Rugg · 08-27-2012, 09:20 AM

I feel a bit stupid. I managed to write my own utility to convert and scale images for my StoryHD, and then I discovered this option in Calibre (so yes, I reinvented the weel for nothing).
My ebookreader reads cbz files so I never thought to "export" to other formats.

I'm gonna test the conversion with landscape images as my utility convert them correctly but are not so easy to read.

Thanks.
Ruggero

ChaosTwin · 08-28-2012, 01:53 AM

which output profile do you use in calibre for converting your cbz's?

Rugg · 08-29-2012, 02:19 PM

Up to now I don't use calibre for comicbooks.

I use my own utility to convert to a convenient cbz structure.

I'm gonna test conversions made by calibre (there are lots of interesting options). I'm gonna write the results/impressions.

Best regards

Xosen · 08-30-2012, 01:37 PM

Hi!

I have a Sony PRS-T1, and I wanted to read manga on it. I use Mangle to reduce the image size and create the CBZ. I then convert the CBZ to EPUB using Calibre, with the option "Disable comic processing". The problem is that Mangle creates images with a 600x800 resolution, but the PRS-T1 needs 600x754. Calibre takes care of this, but then the PNG images file size doubles. So a CBZ file of 100MB after conversion is 200MB.

¿Is there a way to enhance PNG compression on Calibre?

Cheers!

kovidgoyal · 08-30-2012, 02:36 PM

Convert to jpg instead in the comic options.

Xosen · 08-30-2012, 04:19 PM

Quote:

Originally Posted by kovidgoyal

Convert to jpg instead in the comic options.

But won't that affect the quality of the images? The images in the CBZ file are also PNG, so it seems a difference in the image compression.

kovidgoyal · 08-30-2012, 10:35 PM

calibre uses imagemagick to process images. Feel free to ask the imagemagick developers to improves the compression of their png output.

Rugg · 08-31-2012, 08:16 AM

I tried to convert a cbz to epub. Parameters:
I set:
- Generic e-ink device
- custom dimensions 768x1024 (widthXheight)
- 16 colors

The result I get is a very smaller image then expected.

I tried even without specifing dimensions. Same results.

Did I miss something?

kovidgoyal · 08-31-2012, 08:18 AM

Set the output profile to tablet.

Rugg · 08-31-2012, 10:39 AM

Ok, I set:
-Output: Tablet (do not change dimensions)
-colors: 16
-dimensions: 768x1024
-keep proportions
-do not split larger images
- do not create index

It works very well.

Thanks.

ChaosTwin · 09-04-2012, 01:09 AM

I've used the settings which where mentioned above and set the image output type to "jpg" in addition.

the epub file has still the same size as the unprocessed cbz file.
any clues? thx

Qylie · 09-05-2012, 04:39 PM

I tried looking through this thread sorry if I missed the answer - Is there a way to convert from CBR to Epub without stripping the color? I have a color reader and want to keep all the amazing color

kovidgoyal · 09-05-2012, 11:43 PM

Use the option to not remove the color under Comic Input in the conversion dialog.

08-29-2012, 02:19 PM	#260
Rugg Junior Member Posts: 9 Karma: 5914 Join Date: Jul 2012 Device: Iriver Story HD	Calibre options for Iriver cbz conversion Up to now I don't use calibre for comicbooks. I use my own utility to convert to a convenient cbz structure. I'm gonna test conversions made by calibre (there are lots of interesting options). I'm gonna write the results/impressions. Best regards

09-04-2012, 01:09 AM	#268
ChaosTwin Manga Reader Posts: 20 Karma: 10 Join Date: Apr 2011 Location: Austria - no kangaroos Device: Kobo Aura H2O	I've used the settings which where mentioned above and set the image output type to "jpg" in addition. the epub file has still the same size as the unprocessed cbz file. any clues? thx Last edited by ChaosTwin; 09-05-2012 at 09:50 AM.

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08-27-2012, 03:14 AM	#257
ChaosTwin Manga Reader Posts: 20 Karma: 10 Join Date: Apr 2011 Location: Austria - no kangaroos Device: Kobo Aura H2O	What's the best profile for a cbz to epub conversion for an iRiver Story HD with a resolution of 768x1024?

08-27-2012, 09:20 AM	#258
Rugg Junior Member Posts: 9 Karma: 5914 Join Date: Jul 2012 Device: Iriver Story HD	I feel a bit stupid. I managed to write my own utility to convert and scale images for my StoryHD, and then I discovered this option in Calibre (so yes, I reinvented the weel for nothing). My ebookreader reads cbz files so I never thought to "export" to other formats. I'm gonna test the conversion with landscape images as my utility convert them correctly but are not so easy to read. Thanks. Ruggero

08-28-2012, 01:53 AM	#259
ChaosTwin Manga Reader Posts: 20 Karma: 10 Join Date: Apr 2011 Location: Austria - no kangaroos Device: Kobo Aura H2O	which output profile do you use in calibre for converting your cbz's?

08-30-2012, 01:37 PM	#261
Xosen Junior Member Posts: 5 Karma: 10 Join Date: Aug 2012 Device: Sony PRS-T1	Hi! I have a Sony PRS-T1, and I wanted to read manga on it. I use Mangle to reduce the image size and create the CBZ. I then convert the CBZ to EPUB using Calibre, with the option "Disable comic processing". The problem is that Mangle creates images with a 600x800 resolution, but the PRS-T1 needs 600x754. Calibre takes care of this, but then the PNG images file size doubles. So a CBZ file of 100MB after conversion is 200MB. ¿Is there a way to enhance PNG compression on Calibre? Cheers!

08-30-2012, 02:36 PM	#262
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Convert to jpg instead in the comic options.

08-30-2012, 10:35 PM	#264
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	calibre uses imagemagick to process images. Feel free to ask the imagemagick developers to improves the compression of their png output.

08-31-2012, 08:16 AM	#265
Rugg Junior Member Posts: 9 Karma: 5914 Join Date: Jul 2012 Device: Iriver Story HD	I tried to convert a cbz to epub. Parameters: I set: - Generic e-ink device - custom dimensions 768x1024 (widthXheight) - 16 colors The result I get is a very smaller image then expected. I tried even without specifing dimensions. Same results. Did I miss something?

08-31-2012, 08:18 AM	#266
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Set the output profile to tablet.

08-31-2012, 10:39 AM	#267
Rugg Junior Member Posts: 9 Karma: 5914 Join Date: Jul 2012 Device: Iriver Story HD	Ok, I set: -Output: Tablet (do not change dimensions) -colors: 16 -dimensions: 768x1024 -keep proportions -do not split larger images - do not create index It works very well. Thanks.

09-05-2012, 04:39 PM	#269
Qylie Member Posts: 12 Karma: 10 Join Date: Sep 2010 Device: kindle	I tried looking through this thread sorry if I missed the answer - Is there a way to convert from CBR to Epub without stripping the color? I have a color reader and want to keep all the amazing color

09-05-2012, 11:43 PM	#270
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Use the option to not remove the color under Comic Input in the conversion dialog.