<div class="gmail_quote">On Fri, Jun 10, 2011 at 11:35 PM, Sven Langkamp <span dir="ltr"><<a href="mailto:sven.langkamp@gmail.com">sven.langkamp@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div></div><div class="h5"><div class="gmail_quote">On Sat, Jun 11, 2011 at 12:24 AM, Silvio Heinrich <span dir="ltr"><<a href="mailto:plassy@web.de" target="_blank">plassy@web.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>On 06/10/2011 10:21 PM, David REVOY wrote:<br>
> sorry if you don't want to argue, I don't want to hurt with my observations.<br>
> I just hope they make sens, and gives you a user feedback.<br>
</div>:D No it's just too much thinking :P<br>
<div><br>
> :D cool for your developpement time for the flow and opacity now in wash<br>
> mode too !<br>
> They act really good. Thanks !<br>
><br>
><br>
> I'm just a bit sad that it's made on wash mode . Wash mode still have a<br>
> problem in my opinion , something I reported since more than a year with<br>
> the wash mode : I don't know really what happen, I just know it's wrong<br>
> for the result ; and makes the creation of a good airbrush preset in<br>
> Krita almost impossible ( possible with normal mode, but some glitch<br>
> appear with blending mode. ). Maybe it's not about wash mode but about a<br>
> compositing thing or the way the soft edges of the brush is computed.<br>
><br>
> I did this document to help understand what I consider as a problem :<br>
> <a href="http://david.revoy.free.fr/forums/krita/krita_wash-mode-problem.jpg" target="_blank">http://david.revoy.free.fr/forums/krita/krita_wash-mode-problem.jpg</a><br>
> <a href="http://david.revoy.free.fr/forums/krita/krita-opacity_dab-self-collision.jpg" target="_blank">http://david.revoy.free.fr/forums/krita/krita-opacity_dab-self-collision.jpg</a><br>
> and a little joke :<br>
> <a href="http://david.revoy.free.fr/forums/krita/1stroke-brain.png" target="_blank">http://david.revoy.free.fr/forums/krita/1stroke-brain.png</a><br>
</div>I see what the problem is but don't know how this actually happens...<br>
This has nothing to do with the wash/indirect painting mode.<br>
For me it looks more like a mixing problem or something like an<br>
optical illusion. It only happens with soft brushes and it looks like if<br>
there<br>
would be a light line between the dabs.<br>
I need to check if the alpha values are calculated right and how<br>
photoshop deals with it.<br>
Maybe it's a precision problem... hmm... needs investigation :D<br></blockquote></div><br></div></div>Was also dicussed here <a href="https://bugs.kde.org/show_bug.cgi?id=251612" target="_blank">https://bugs.kde.org/show_bug.cgi?id=251612</a><br>
<br></blockquote><div><br></div><div>I added a little to the discussion in the bug, in particular:</div><div><br></div><div>In the bug report, Cyrille made an experiment with a perfect angular line to test if the soft brush was working appropriately. An artifact was clearly visible in the corner, but the color sample tool revealed it was just ok. I think that effect could be due to Mach bands:</div>
<div><div><a href="http://en.wikipedia.org/wiki/Mach_bands">http://en.wikipedia.org/wiki/Mach_bands</a></div></div></div><br><div>Or to the many different optical adjustments occurring either at the retinal ganglion level, the brain, or somewhere in between, that cause optical illusions... (i.e.: even we have bugs).</div>
<div><br></div>