[xep-support] Another question?

[Nikolai Grigoriev]

Hello Pierre,

> May I use external-graphics and background-color together? Then, I can
> specify some regions' color in the picture as transparency in order to
show
> the background-color beneath it.

Yes, you can specify background-color on fo:external-graphic. This color
will be visible in transparent portions of the image, and around
the image if the padding is not zero.

> Also, which graphics format can be allowed
> to specify some region as transparency?

We support transparency in GIFs. In PNG, we support single-color
transparency for grayscale and TrueColor images. For palette
(indexed color) PNG images, the first fully transparent color
is picked from the palette (only one). Alpha channel is not
supported.

NOTE: transparency works in PDF output only!

Best regards,
Nikolai Grigoriev
RenderX

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