Re: mask: luminance or alpha

• From: Brian Birtles <birtles@gmail.com>
• Date: Wed, 01 Aug 2012 08:02:44 +0900
• To: Rik Cabanier <cabanier@gmail.com>
• CC: "Tab Atkins Jr." <jackalmage@gmail.com>, www-svg@w3.org
• Message-ID: <50186414.9070602@gmail.com>

(2012/08/01 6:27), Rik Cabanier wrote:
> So, <auto> means 'alpha' if you point to an image and 'luminosity' if
> you point to vector data?
> I think that's reasonable and similar to PDF's soft mask images.

The way it's currently spec'ed is different. <auto> means 'luminance' 
for <mask>s (unless they have maskType="alpha") and 'alpha' elsewhere.

We can change that, however, if we feel the vector vs raster distinction 
is easier for authors (and not just designers).

Brian

Received on Tuesday, 31 July 2012 23:03:15 UTC