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Re: TRANSPARENCY

From: Bob Holmes <rangsynth@gmail.com>
Date: Mon, 6 Aug 2012 23:35:52 +0200
Message-ID: <CAMvo67bkL4voiyQoBji+M7kd5nEiTHtxM1KBS-++P2THw=+9kQ@mail.gmail.com>
To: Rik Cabanier <cabanier@gmail.com>
Cc: Nikos Andronikos <Nikos.Andronikos@cisra.canon.com.au>
RESEND TO THE GROUP

On 8/6/12, Rik Cabanier <cabanier@gmail.com> wrote:
> On Mon, Aug 6, 2012 at 9:29 AM, Bob Holmes <rangsynth@gmail.com> wrote:
>
>> Off Topic/Transparency
>>
>> In Delphi, they have a concept of transparency where you can set the
>> "Transparent Color" for a bitmap. If the color from the bitmap equals
>> the "transparent color" then it does not show on the screen. This is
>> from older methods of compositing where the composite is ignored for
>> the transparent color.
>>
>
> That's color key masking in PDF and PostScript.
>
>
>>
>> In new system with proper blending this must be a result of simply
>> setting the alpha of the source to zero?
>>
>
> No, I don't think it's possible. If you feel like SVG needs this, you
> should bring it up on the mailing list.
>
>
>>
>> If you are planning on including anything about transparency and
>> bitmaps that use a transparent color for whole pixels(like 24 bit
>> bitmaps where everything that is fuschia color is invisible or
>> equivalent to alpha of 0) in the spec then please let me know about
>> that and if there might be any catches at the blending side of things.
>>
>
Received on Monday, 6 August 2012 21:36:14 GMT

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