Re: mask: luminance or alpha

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 UTC