From: Calculemus <calculemus1988@gmail.com>

Date: Fri, 13 Jul 2012 19:36:43 +0200

Message-ID: <CAOn8Oo838pruzs3CpoESQcuOSUQECbJfY3FaMB3YEctgBpjVrQ@mail.gmail.com>

To: Rik Cabanier <cabanier@gmail.com>

Cc: www-svg@w3.org

Date: Fri, 13 Jul 2012 19:36:43 +0200

Message-ID: <CAOn8Oo838pruzs3CpoESQcuOSUQECbJfY3FaMB3YEctgBpjVrQ@mail.gmail.com>

To: Rik Cabanier <cabanier@gmail.com>

Cc: www-svg@w3.org

About HDR, the problem is they can take values bigger than 1. Let's say I have two HDR images with values in range 0-4. Do I first map the range 0-4 to 0-1, do the blend math, and go back to 0-4? Do I just do the math on the range 0-4 and then clamp? I am rereading the SVG docs, and I am not sure if the general compositing formula implies that I should implement all combinations of porter-duff operations and blend modes? Or I should just use 'src_over' for blend modes and have a separate function for each of the porter-duff operations? I mean do you need to use any other porter-duff operation with blend modes? Does it make sense to do for example screen(blend mode) and in(porter-duff)?Received on Friday, 13 July 2012 17:37:14 UTC

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