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RE: ISSUE-2343: 15.12 Filter primitive ‘feComposite’ formula [SVG 1.1 F2 Last Call]

From: Anthony Grasso <Anthony.Grasso@cisra.canon.com.au>
Date: Fri, 10 Dec 2010 06:46:03 +0000
To: "Dr. Olaf Hoffmann (Dr.O.Hoffmann@gmx.de)" <Dr.O.Hoffmann@gmx.de>
CC: SVG Working Group WG <public-svg-wg@w3.org>
Message-ID: <923A4276C1903646BE5299CA8462B0A0173E5434@EXM01-WVP.cisra.canon.com.au>
Hi Dr. Hoffmann,

Thank you for your suggested wording to add to feComposite arithmetic operation.

I was given an action [1] to add the text as suggested. This action has now been completed. The updated specification can be found in our web CVS archive [2]. Note that this version is the unpublished version of the spec and may appear to be missing text formatting.

Please advise the SVG Working Group if you have any further comments or feedback regarding this issue.

Kind Regards,

Anthony Grasso

[1] http://www.w3.org/Graphics/SVG/WG/track/actions/2819

[2] http://dev.w3.org/SVG/profiles/1.1F2/master/filters.html#feCompositeElement

> -----Original Message-----
> From: public-svg-wg-request@w3.org [mailto:public-svg-wg-
> request@w3.org] On Behalf Of SVG Working Group Issue Tracker
> Sent: Tuesday, 29 June 2010 11:36 PM
> To: public-svg-wg@w3.org
> Subject: ISSUE-2343: 15.12 Filter primitive ‘feComposite’ formula [SVG
> 1.1 F2 Last Call]
> ISSUE-2343: 15.12 Filter primitive ‘feComposite’ formula [SVG 1.1 F2
> Last Call]
> http://www.w3.org/Graphics/SVG/WG/track/issues/2343

> Raised by: Erik Dahlström
> On product: SVG 1.1 F2  Last Call
> about arithmetic operation of feComposite is mentioned:
> 'If the arithmetic operation is chosen, each result pixel is computed
> using the following formula:
> result = k1*i1*i2 + k2*i1 + k3*i2 + k4'
> What is especially i1 and i2?
> My assumption is, that it is the value of the corresponding channel of
> the input indicated by the attributes in for i1 and in2 for i2?
> If this is correct, my suggestion is to add something like:
> ',where i1 and i2 indicate the corresponding pixel channel values of
> the input images, indicated by the attributes in for i1 and in2 for i2,
> and k1, k2, k3, k4 indicate the values of the attributes with the same
> name.'
> Another suggestion to improve the understanding of the other operations
> is to add formulas for the other operations as well. This can help
> authors a lot, because the original article from Porter and Duff is not
> trivial to find for all readers, for example currently here an online
> version:
> http://keithp.com/~keithp/porterduff/p253-porter.pdf

> Additional suggestion for the related example:
> Add a generic font-family -
> Instead of font-family="Verdana" use for example font-family="Verdana,
> sans-serif"
> Original mail:
> http://www.w3.org/mid/201006291243.33346.Dr.O.Hoffmann@gmx.de


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Received on Friday, 10 December 2010 06:46:34 UTC

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