Image with alpha channel changes to black color

Hiro5 · 10-01-2010, 08:02 AM

I tried to convert an EPUB file with some png/gif files that have transparent zones, and that zones turns to black color, when i convert it to .MOBI for a kindle3.

If a ebook page it's supposed to be white (usually)... Why the "transparent zone" turns black?

Is there any option that i cannot see to fix|change this?
or do i have to edit the image file manually before the conversion?

Note: I know that I can use the "Tweak epub" option and edit the image, and this is not a big problem. But, why don't to add an option to fix this, or change the default black color to white?

Sorry for my poor english
and Thanks for any answer.

kovidgoyal · 10-01-2010, 12:06 PM

the color is not changed to black, the kindle just doesn't support transparency in images, which causes them to be rendered as black.

10-01-2010, 08:02 AM	#1
Hiro5 Junior Member Posts: 3 Karma: 10 Join Date: Oct 2010 Device: K3	Image with alpha channel changes to black color I tried to convert an EPUB file with some png/gif files that have transparent zones, and that zones turns to black color, when i convert it to .MOBI for a kindle3. If a ebook page it's supposed to be white (usually)... Why the "transparent zone" turns black? Is there any option that i cannot see to fix\|change this? or do i have to edit the image file manually before the conversion? Note: I know that I can use the "Tweak epub" option and edit the image, and this is not a big problem. But, why don't to add an option to fix this, or change the default black color to white? Sorry for my poor english and Thanks for any answer. Last edited by Hiro5; 10-01-2010 at 08:42 AM.

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10-01-2010, 12:06 PM	#2
kovidgoyal creator of calibre Posts: 43,866 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	the color is not changed to black, the kindle just doesn't support transparency in images, which causes them to be rendered as black.

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