W3C home > Mailing lists > Public > www-svg@w3.org > July 2012

Re: mask: luminance or alpha

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 30 Jul 2012 21:12:03 -0700
Message-ID: <CAAWBYDAOfrczsQS2afPj-BeRQ88gXRamOaLJeMQxAMKx-X9=gA@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: Dirk Schulze <dschulze@adobe.com>, Rik Cabanier <cabanier@adobe.com>, "www-svg@w3.org" <www-svg@w3.org>
On Mon, Jul 30, 2012 at 9:06 PM, Rik Cabanier <cabanier@gmail.com> wrote:
> Designers don't know what the underlying technology does. They see options
> in dialogs for fancy dropshadows and glows and have no idea how many
> masking/blending/compositing operations those result in.
> The option in Illustrator is called "create opacity mask" which sounds like
> "alpha mask", but it's really a "luminosity mask"

I definitely know that in my first experience with <mask>, I tried to
use a gradient from black to transparent, and was very confused.  It
seemed intuitively obvious that the mask would "transfer" its own
alpha to the content.

Received on Tuesday, 31 July 2012 04:12:51 UTC

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