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Re: mask: luminance or alpha

From: Dirk Schulze <dschulze@adobe.com>
Date: Mon, 30 Jul 2012 19:51:08 -0700
To: Rik Cabanier <cabanier@gmail.com>
CC: Rik Cabanier <cabanier@adobe.com>, "Tab Atkins Jr." <jackalmage@gmail.com>, "www-svg@w3.org" <www-svg@w3.org>
Message-ID: <DC50A896-F456-442A-B203-36069A536F1F@adobe.com>

On Jul 30, 2012, at 7:31 PM, Rik Cabanier <cabanier@gmail.com> wrote:

> Any vector artwork created from any Adobe application, InkScape, CorelDraw and XAML.
No, I meant content. All these products can create alpha masks as well. That doesn't count, otherwise I could say 99.99% of the vector artwork use alpha masking :). No seriously, most people I spoke with thought that masking would operate on the alpha channel initially. It just seems to be more intuitive. However, in SVG we will actually support both!


> My number does not include Flash since it doesn't have luminosity masks (only alpha) so people didn't have choice but I've seen workaround using pixel bender.
Sounds like authors are already more familiar with alpha masks.

Greetings,
Dirk


> 
> For some operations that look like they could use alpha masks (like gradient shadows), our products still use luminosity. I can't remember the details but I can ask.
> 
> Rik
> 
> On Mon, Jul 30, 2012 at 5:16 PM, Dirk Schulze <dschulze@adobe.com> wrote:
> 
> On Jul 30, 2012, at 4:57 PM, "Rik Cabanier" <cabanier@adobe.com> wrote:
> 
> > Looking at current vector artwork, 99.99% is using luminosity.
> That is an interesting number, where did you get this number and which vector artwork are you referring?
> 
> Dirk
> 
> > It's much easier to manipulate for a designer than alpha (since it's easier to visualize and since overlapping elements with alpha interact with each other)
> >
> > Rik
> >
> >> -----Original Message-----
> >> From: Tab Atkins Jr. [mailto:jackalmage@gmail.com]
> >> Sent: Monday, July 30, 2012 4:48 PM
> >> To: Rik Cabanier
> >> Cc: www-svg@w3.org
> >> Subject: Re: mask: luminance or alpha
> >>
> >> On Mon, Jul 30, 2012 at 4:13 PM, Rik Cabanier <cabanier@adobe.com>
> >> wrote:
> >>> Last week, there was a decision to have the id-less mask have ‘alpha’
> >>> as the default instead of ‘luminance’
> >>>
> >>> Can someone explain the rational for doing this again?
> >>>
> >>> It changes existing default behavior, is not what people want or what
> >>> products like Illustrator and InkScape currently support.
> >>
> >> The idea is that this *is* what people want.  We just can't change <mask>'s
> >> default behavior due to legacy compat.
> >>
> >> ~TJ
> 
Received on Tuesday, 31 July 2012 02:51:37 GMT

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