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List:       kde-kimageshop
Subject:    Re: Impasto discussion
From:       Dmitry Kazakov <dimula73 () gmail ! com>
Date:       2010-07-09 20:01:06
Message-ID: AANLkTimbA6AXuH0k_-9LwiYTwlXU5rLVvCOgqy-e_Gx3 () mail ! gmail ! com
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> I think, instead of rendering every layer, it is better to use
> > COMPOSITE_ALPHA_DARKEN for impasto channel. It'll be much cheaper. In
> such a
> > case, the final impasto value of the point on projection will be equal to
> > the value of the most opaque layer.
>
> No, that doesn't work well, as I explained:
> > That technique has obvious problems, since it effectively amounts to
> > carving an alpha-mask-shaped hole in the underlying layers' impasto,
> > rather than letting the layer as a whole float above the layers beneath.
>

Well, maybe I don't understand something... I meant the following:
* every layer has an impasto channel
* let's have three layers:

Layer1: alpha=transparent; impasto=100;
Layer2: alpha=opaque; impasto=125;
Layer3: alpha=transparent; impasto=50;

The result impasto value will be: 125

Isn't it what expected?



>  (Also, it lets you do things like assign different materials to each
> layer. Different light source, even, though I don't know why you would
> want to do that. But I could see different materials.)
>

Yeah, different material is a good point for per-layer impasto.

PS:
Btw, if we manage to implement impasto as a filter, per-layer impasto will
be easily achieved with a usual Filter Mask.


-- 
Dmitry Kazakov

[Attachment #5 (text/html)]

<br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt \
0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: \
1ex;"><div><div class="h5"> &gt; I think, instead of rendering every layer, it is \
better to use<br> &gt; COMPOSITE_ALPHA_DARKEN for impasto channel. It&#39;ll be much \
cheaper. In such a<br> &gt; case, the final impasto value of the point on projection \
will be equal to<br> &gt; the value of the most opaque layer.<br>
<br>
</div></div>No, that doesn&#39;t work well, as I explained:<br>
<div class="im">&gt; That technique has obvious problems, since it effectively \
amounts to<br> &gt; carving an alpha-mask-shaped hole in the underlying layers&#39; \
impasto,<br> &gt; rather than letting the layer as a whole float above the layers \
beneath.<br></div></blockquote><div><br>Well, maybe I don&#39;t understand \
                something... I meant the following:<br>* every layer has an impasto \
                channel<br>
* let&#39;s have three layers:<br><br>Layer1: alpha=transparent; \
impasto=100;<br>Layer2: alpha=opaque; impasto=125;<br>Layer3: alpha=transparent; \
impasto=50;<br><br>The result impasto value will be: 125<br><br>Isn&#39;t it what \
expected?<br>  </div><div>  </div><blockquote class="gmail_quote" style="margin: 0pt \
0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div \
class="im"> </div>
(Also, it lets you do things like assign different materials to each<br>
layer. Different light source, even, though I don&#39;t know why you would<br>
want to do that. But I could see different \
materials.)<br></blockquote></div><br>Yeah, different material is a good point for \
per-layer impasto.<br><br>PS:<br>Btw, if we manage to implement impasto as a filter, \
per-layer impasto will be easily achieved with a usual Filter Mask.<br> <br><br>-- \
<br>Dmitry Kazakov<br>



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