CBR images converted to greyscale in EPUB/AZW3 converted files

csscribus · 11-20-2020, 08:23 PM

Hi, I'm new here, so I hope you can forgive me for posting a question that may have been answered before.

I'm currently finishing a two-page article on Calibre for the leading Swiss magazine on print and digital publishing (publisher.ch).

Personally, I've used Calibre only for my own purposes and thought (and still think) this is an amazing piece of work. However, as someone who doesn't consume comics, I wasn't aware of Calibre's capability to open and convert comic books file formats. Since I wrote an article on Krita (https://publisher.ch/2018/02/05/mehr...malwerkzeug-2/) for the magazine, I thought that would be an interesting aspect for the readers.

So I downloaded a CBR file and converted it to EPUB only to discover that all colour images in the ZIP container had been converted to greyscale.

Hence my question: Is this a bug or a feature?

theducks · 11-20-2020, 08:35 PM

OPTION
By default the Conversion option converts to B&W unless you tick the box.
Also, I believe the Device Profile may kick in (aimed at e-ink). Tablet mode should not tamper with images as much

JSWolf · 11-20-2020, 08:41 PM

Quote:

Originally Posted by theducks

OPTION
By default the Conversion option converts to B&W unless you tick the box.
Also, I believe the Device Profile may kick in (aimed at e-ink). Tablet mode should not tamper with images as much

Tablet will not modify any images.

kovidgoyal · 11-20-2020, 08:58 PM

Turn off the option to do that in the comic input section of the conversion dialog. calibre is optimized for e-ink devices, hence the default of grayscaling.

csscribus · 11-20-2020, 09:25 PM

Thanks for your replies. This option is well-hidden.

Anyway, I can now finish the article, and believe me, it will be a praise of Calibre. Thanks a lot for your work!

csscribus · 12-27-2020, 07:59 PM

Hi,

The article has been printed and is now available online (in German): https://publisher.ch/2020/12/23/teil...tware-calibre/

Thanks for your support!

11-20-2020, 08:23 PM	#1
csscribus Junior Member Posts: 3 Karma: 10 Join Date: Nov 2020 Device: None	CBR images converted to greyscale in EPUB/AZW3 converted files Hi, I'm new here, so I hope you can forgive me for posting a question that may have been answered before. I'm currently finishing a two-page article on Calibre for the leading Swiss magazine on print and digital publishing (publisher.ch). Personally, I've used Calibre only for my own purposes and thought (and still think) this is an amazing piece of work. However, as someone who doesn't consume comics, I wasn't aware of Calibre's capability to open and convert comic books file formats. Since I wrote an article on Krita (https://publisher.ch/2018/02/05/mehr...malwerkzeug-2/) for the magazine, I thought that would be an interesting aspect for the readers. So I downloaded a CBR file and converted it to EPUB only to discover that all colour images in the ZIP container had been converted to greyscale. Hence my question: Is this a bug or a feature?

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11-20-2020, 08:35 PM	#2
theducks Well trained by Cats Posts: 30,891 Karma: 60358908 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	OPTION By default the Conversion option converts to B&W unless you tick the box. Also, I believe the Device Profile may kick in (aimed at e-ink). Tablet mode should not tamper with images as much

11-20-2020, 08:58 PM	#4
kovidgoyal creator of calibre Posts: 45,171 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Turn off the option to do that in the comic input section of the conversion dialog. calibre is optimized for e-ink devices, hence the default of grayscaling.

11-20-2020, 09:25 PM	#5
csscribus Junior Member Posts: 3 Karma: 10 Join Date: Nov 2020 Device: None	Thanks for your replies. This option is well-hidden. Anyway, I can now finish the article, and believe me, it will be a praise of Calibre. Thanks a lot for your work!

12-27-2020, 07:59 PM	#6
csscribus Junior Member Posts: 3 Karma: 10 Join Date: Nov 2020 Device: None	Hi, The article has been printed and is now available online (in German): https://publisher.ch/2020/12/23/teil...tware-calibre/ Thanks for your support!

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