https://bugs.kde.org/show_bug.cgi?id=409627

--- Comment #6 from Tyson Tan <tysont...@gmail.com> ---
(In reply to Tymond from comment #4)
> Created attachment 121532 [details]
> Screenshot of the workaround + new mode
> 
> This is the result of my work for now.
> 
> On the left, you can see the workaround with a group that has a black layer
> on Normal mode (let's call it "workaround middle layer"), then a layer with
> the new color in Normal mode (let's call it "workaround top layer"), and
> then the whole group is in Addition mode (let's call it "workaround group").
> Right side is my new blending mode. Color values are just the same, I
> checked it.
> 
> I have a question how this blending mode should behave while being on a
> layer that has a lower opacity than 50%. 
> 
> On the right side of the screenshot you can see two rows of smaller
> yellowish-whitish circles. The first row is compiled out of 9 circles
> painted with 20, 50, 40 etc. to 100% of opacity. The second one is the same
> layer, but the opacity of the layer is 50%. As you can see, the brightest
> circle on the layer is yellow and looks the same as 50% opacity circle in
> the top row.
> 
> On the left side there are two rows under the first "reference" one - first
> one is when you lower the opacity of the "workaround top layer" to 50%. The
> second one is when you lower the opacity of the "workaround group" to 50%.
> The first row has values identical to what you can get in the new blending
> mode. The second one is an example of how I can make it behave.
> 
> The question is, whether you think it should behave (after lowering opacity
> of the layer) like the second small circle row or like the third one? What
> about making a transparency mask? (If I leave it as it is, it will be always
> consistent; I'm just not sure if it's what is expected. This is the first
> blending mode that uses alpha for something else than just blending two
> output colors together, here we calculate the result color using the alpha
> value). If you don't have a preference, please tell me so, too.
> 
> Another question: do you have an access to SAI or Photoshop? I need to know
> what the value of the color is if you put a layer of color (10, 100, 200) in
> 30% and on top of that color (250, 200, 150) in 50% in the Luminosity (SAI)
> blending mode. Workaround don't work at all on that example and I think my
> blending mode can have "incorrect" colors there.

Hi Tymond,
Thank you for helping us with the new blending mode! I'm very busy at the
moment so I cannot do the tests right away. I did secure access to PS and SAI
again, and I will let you know about the result. I cannot fully understand what
you were saying by a glance, so please give me some time.

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