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List:       kde-kimageshop
Subject:    Re: Observation of a zoom-engine of PS
From:       Dmitry Kazakov <dimula73 () gmail ! com>
Date:       2009-11-01 22:28:23
Message-ID: ae32c1ef0911011428mb26efaco5d249e1cb4fc5ff2 () mail ! gmail ! com
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On Mon, Nov 2, 2009 at 12:21 AM, LukasT.dev@gmail.com
<lukast.dev@gmail.com>wrote:

> On Sunday 01 November 2009 15:25:58 Dmitry Kazakov wrote:
> > Hi!
> >
> > Just an observation i got today while using PS7.  =)
> > It has quite good and fast zooming engine. And the most interesting fact
> > about that - it uses different zoom-algorithms for different zoom-levels.
> > More exactly:
> >
> > For zoom-levels 100,50,25,12.5 - it uses smooth-scale algorithm
> > For other levels - nearest-neighbor. More than that, it uses nearest
> > prescaled(?) image for NN-sampling.
> >
>
> In Krita's OpenGL canvas we use linear interpolation (you called that
> smooth-
> scale) for zoom level below 200 % and nearest neighbour for the levels
> above.
> Check kis_opengl_canvas2.cpp (line 223).
>
>
QPainter canvas works right the same way =)



-- 
Dmitry Kazakov

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<br><br><div class="gmail_quote">On Mon, Nov 2, 2009 at 12:21 AM, <a \
href="mailto:LukasT.dev@gmail.com">LukasT.dev@gmail.com</a> <span dir="ltr">&lt;<a \
href="mailto:lukast.dev@gmail.com">lukast.dev@gmail.com</a>&gt;</span> wrote:<br> \
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); \
margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5">On \
Sunday 01 November 2009 15:25:58 Dmitry Kazakov wrote:<br>

&gt; Hi!<br>
&gt;<br>
&gt; Just an observation i got today while using PS7.   =)<br>
&gt; It has quite good and fast zooming engine. And the most interesting fact<br>
&gt; about that - it uses different zoom-algorithms for different zoom-levels.<br>
&gt; More exactly:<br>
&gt;<br>
&gt; For zoom-levels 100,50,25,12.5 - it uses smooth-scale algorithm<br>
&gt; For other levels - nearest-neighbor. More than that, it uses nearest<br>
&gt; prescaled(?) image for NN-sampling.<br>
&gt;<br>
<br>
</div></div>In Krita&#39;s OpenGL canvas we use linear interpolation (you called that \
smooth-<br> scale) for zoom level below 200 % and nearest neighbour for the levels \
above.<br> Check kis_opengl_canvas2.cpp (line 223).<br>
<br></blockquote><div><br>QPainter canvas works right the same way \
=)<br></div></div><br><br clear="all"><br>-- <br>Dmitry Kazakov<br>



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