'Re: [calligra/krita-optimize-zachmann] krita/plugins/filters/colorsfilters: Optimize per channel fil'

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List:       kde-kimageshop
Subject:    Re: [calligra/krita-optimize-zachmann] krita/plugins/filters/colorsfilters: Optimize per channel fil
From:       Dmitry Kazakov <dimula73 () gmail ! com>
Date:       2015-07-03 15:14:18
Message-ID: CAEkBSfW51rBJhpx865EfF3eviLE5MeAqY4KiouZrRbnqdxmzaw () mail ! gmail ! com
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On Fri, Jul 3, 2015 at 7:32 AM, Thorsten Zachmann < <t.zachmann@zagge.de>>
wrote:

> Git commit df3efb5e49354337b2eb39f054c17e8e5c94f6ed by Thorsten Zachmann.
> Committed on 03/07/2015 at 04:25.
> Pushed by zachmann into branch 'krita-optimize-zachmann'.
>
> Optimize per channel filter.
>
> Don't create the transformation for every patch. The speed difference is
> very
> noticable if lightness is changed.
>

Hehe, yes, perchannel trasnformation may be really complex in 'Lightness'
mode, because it converts the pixels to Lab, applies the transformation on
the 'L' curve and then converts the colors back to the source color space.
Nice catch!

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<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Jul 3, 2015 \
at 7:32 AM, Thorsten Zachmann <span dir="ltr">&lt;<a \
href="mailto:t.zachmann@zagge.de" target="_blank"></a>&gt;</span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex">Git commit df3efb5e49354337b2eb39f054c17e8e5c94f6ed by \
Thorsten Zachmann.<br> Committed on 03/07/2015 at 04:25.<br>
Pushed by zachmann into branch &#39;krita-optimize-zachmann&#39;.<br>
<br>
Optimize per channel filter.<br>
<br>
Don&#39;t create the transformation for every patch. The speed difference is very<br>
noticable if lightness is changed.<br></blockquote><div><br></div><div>Hehe, yes, \
perchannel trasnformation may be really complex in &#39;Lightness&#39; mode, because \
it converts the pixels to Lab, applies the transformation on the &#39;L&#39; curve \
and then converts the colors back to the source color space. Nice \
catch!<br></div><div>  </div></div><br></div></div>

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