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Re: Renderiing filters

From: Sigurd Lerstad <sigler@bredband.no>
Date: Thu, 23 Aug 2001 19:41:48 +0200
Message-ID: <000201c12c0c$74acb5b0$510473d5@NYMASKIN>
To: "Thomas E Deweese" <thomas.deweese@kodak.com>
Cc: <www-svg@w3.org>
Thanks for answering,

I'm still not sure of what I should do. I'd like to do it the way most
existing implementations are done. That way, I know my approach is a "safe"

thanks again,

Sigurd Lerstad

> SL> I'm wondering what the intended/recommended way (if there is such
> SL> a thing) to render elements that have a style="filter:#..." on
> SL> them
>     Correctly :)
> SL> My question is:
> SL> Should I process the filters in an untransformed coordinate-system
> SL> (I mean, the X axis is horizontal and the Y-axis is vertical) and
> SL> then transform the final/resulting image into the other coordinate
> SL> system (easier for most filters, especially the gaussianBlur), but
> SL> quality will suffer, and makes it harder with
> SL> BackgroundGraphic/BackgroundAlpha
> SL> OR
> SL> Should I process the filters in the correct coordinate system from
> SL> the start (might be difficult for some filters), but quality will
> SL> be high
>     For some transforms one way makes sense for some the other makes
> sense.  I would suggest that if you are doing the filter in an
> untransformed coordinate system and later transforming that to the
> device, you should use a fairly high quality implementation of affine
> transform to do the mapping, you should also take care to scale the
> untransformed coordinate system properly.
Received on Thursday, 23 August 2001 15:45:42 UTC

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