<div class="gmail_quote">On Sat, Sep 26, 2009 at 9:20 PM, Dmitry Kazakov <span dir="ltr"><<a href="mailto:dimula73@gmail.com">dimula73@gmail.com</a>></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;">
<br><br><div class="gmail_quote"><div class="im">On Sat, Sep 26, 2009 at 10:52 PM, Cyrille Berger <span dir="ltr"><<a href="mailto:cberger@cberger.net" target="_blank">cberger@cberger.net</a>></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>On Saturday 26 September 2009, Dmitry Kazakov wrote:<br>
> On Sat, Sep 26, 2009 at 10:14 AM, Cyrille Berger <<a href="mailto:cberger@cberger.net" target="_blank">cberger@cberger.net</a>>wrote:<br>
> > On Saturday 26 September 2009, Dmitry Kazakov wrote:<br>
> > > > for a,b,c) it doesn't work perfectly, but it's not that broken.<br>
> > ><br>
> > > But still not usable =(<br>
> ><br>
> > Well now, I have fix all the issue with the alpha colorspace (I have<br>
> > added alpha darken). All it remains to do is to make mask support the<br>
> > indirect painting interface.<br>
><br>
> Well, no. You've not fixed that. It's just a workaround.<br>
><br>
> Testcase:<br>
> 1) Create any mask (e.g. transparency mask)<br>
> 2) Paint something on a mask to get transparency<br>
><br>
> Let's imagine after these steps you decide to make some rect visible again,<br>
> what are you going to do? In a good editor you just select this rect with<br>
> selection and fill it with a white color (or any semi-transparent one(!)).<br>
</div>Why white ?<br></blockquote></div><div><br>I can't remember which color is used usually (e.g. in a "well known graphical editor"). I guess, when we paint with white paint the image becomes opaque, when we paint with black paint - becomes transparent, with gray color - becomes semi-transparent.<br>
</div></div></blockquote><div><br>At the moment there is a fundamental difference between Gimp/Photoshop and Krita in the way we see masks. In both cases we have and (8-bit) one channel paint device, so not a technical difference.<br>
The actual difference is how these channel is interpreted: In Gimp/Photoshop is a grayscale representation while in Krita it's an alpha representation. <br><br>The grayscale way is probably what most artists are used too, even if the meaning of black and white is arbitary. The advantage is that it match good with gradient and fill.<br>
<br>The way Krita uses is closer to the physical representation either there is something (color) or you can look through it. The problem that Dmitry descibes is that the only way to "paint" transparency is the eraser tool in Krita, which might be unusual for users form other editors. The bigger problem is that you e.g. can't use a transparent color in the fill tool.<br>
<br>I hope that's the correctly summarizes it.<br></div></div><br>