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.

~TJ
Received on Tuesday, 31 July 2012 04:12:51 GMT

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