Branch krita-ui_improvements-silvioheinrich

[JL VT]

On Fri, Jun 10, 2011 at 11:35 PM, Sven Langkamp <sven.langkamp at gmail.com>wrote:

> On Sat, Jun 11, 2011 at 12:24 AM, Silvio Heinrich <plassy at web.de> wrote:
>
>> On 06/10/2011 10:21 PM, David REVOY wrote:
>> > sorry if you don't want to argue, I don't want to hurt with my
>> observations.
>> > I just hope they make sens, and gives you a user feedback.
>> :D No it's just too much thinking :P
>>
>> > :D cool for your developpement time for the flow and opacity now in wash
>> > mode too !
>> > They act really good. Thanks !
>> >
>> >
>> > I'm just a bit sad that it's made on wash mode . Wash mode still have a
>> > problem in my opinion , something I reported since more than a year with
>> > the wash mode : I don't know really what happen, I just know it's wrong
>> > for the result ; and makes the creation of a good airbrush preset in
>> > Krita almost impossible ( possible with normal mode, but some glitch
>> > appear with blending mode. ). Maybe it's not about wash mode but about a
>> > compositing thing or the way the soft edges of the brush is computed.
>> >
>> > I did this document to help understand what I consider as a problem :
>> > http://david.revoy.free.fr/forums/krita/krita_wash-mode-problem.jpg
>> >
>> http://david.revoy.free.fr/forums/krita/krita-opacity_dab-self-collision.jpg
>> > and a little joke :
>> > http://david.revoy.free.fr/forums/krita/1stroke-brain.png
>> I see what the problem is but don't know how this actually happens...
>> This has nothing to do with the wash/indirect painting mode.
>> For me it looks more like a mixing problem or something like an
>> optical illusion. It only happens with soft brushes and it looks like if
>> there
>> would be a light line between the dabs.
>> I need to check if the alpha values are calculated right and how
>> photoshop deals with it.
>> Maybe it's a precision problem... hmm... needs investigation :D
>>
>
> Was also dicussed here https://bugs.kde.org/show_bug.cgi?id=251612
>
>
I added a little to the discussion in the bug, in particular:

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:
http://en.wikipedia.org/wiki/Mach_bands

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).
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