[xep-support] Another question?

Nikolai Grigoriev grig at renderx.com
Wed Feb 26 12:28:05 PST 2003

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
> 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

NOTE: transparency works in PDF output only!

Best regards,
Nikolai Grigoriev

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