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Re: <canvas> JPEG quality

From: Dannii <curiousdannii@gmail.com>
Date: Fri, 6 Jun 2008 01:13:58 +1000
Message-ID: <af3e73120806050813j32cb264dn638721d2f19a3a00@mail.gmail.com>
To: "Anne van Kesteren" <annevk@opera.com>
Cc: "HTML WG" <public-html@w3.org>

Hmmm. 0.75 isn't an integer.

On Fri, Jun 6, 2008 at 1:04 AM, Anne van Kesteren <annevk@opera.com> wrote:
>
> At Opera we're planning on adding support to <canvas> for JPEG as export
> format. To make the file size reasonable there needs to be a way to set the
> quality level of the JPEG. Wikipedia has a nice example of why that matters:
>
>  http://en.wikipedia.org/wiki/JPEG#Sample_photographs
>
> One simple solution to this which is reasonably consistent with the rest of
> the <canvas> API is to add a jpegQuality DOM attribute to the <canvas>
> element which takes an integer in the range 0-1 (similar to globalAlpha).
> The default value could maybe be 0.75 as that usually gives reasonable
> looking images with a much smaller size than 1.0.
>
> This attribute only affects toDataURL() and only when the first argument is
> not omitted and case-insensitively matches "image/jpeg".
>
>
> --
> Anne van Kesteren
> <http://annevankesteren.nl/>
> <http://www.opera.com/>
>
>
Received on Thursday, 5 June 2008 15:14:33 UTC

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