@urzeye （killy） has developed a new color mixing algorithm, which he originally posted in this post.（At that time, it was different from the theme of that post, so it was ignored…）Killy compiled an executable software, but he is busy with work, so I am sending this post.
Watch the videos:
Download key source code and executable files:
Attention: The previous smudging brush cannot be used as it may cause errors. It comes with two smudging brushes, one mixed and the other blurred
Some people want to make several parameters of smudge more independent (such as bug 353665)
Some people want to simulate the brush color mixing of SAI or CSP
After some analysis, their principles are similar, both separating RGB mixing and alpha mixing into two parameters
They have the following characteristics:
When RGB is mixed with 100 and alpha is mixed with 0
When RGB is mixed with 0 and alpha is mixed with 100
in csp
in sai
klliy’s smudge：
This makes it possible to ‘make brushes that lightly blend colors while being opaque’.（bug 353665）
Other
1.Part of the content of ‘Blurring mode’ mr has been integrated, so the second option has been changed to ‘blur’ (controlling the blur intensity through ‘smudge radius’). As a result, performance issues may arise (it seems that only the first dab will be blurred in CSP/pathstorm).
2.The ‘smudge length’ has also been changed.It controls the sampling position, with a value of 1 sampling at the previous pen tip position and a value of 0 sampling at the current pen tip position.Its behavior is also similar to sai/csp.(There are only two options for ‘Mean offset’ in ‘Blurring mode’ mr: 0 and 1.)
3.As mentioned earlier, Killy is busy with work, so it’s difficult to find time to better integrate it into Krita. (Especially considering that the smudge algorithm in 5.0 may even lead to rewriting the engine…)
The ideal scenario would be to turn ‘use new smear algorithm’ into a checkbox to switch between the three algorithms. The new ‘alpha rate’ parameter is usually displayed in gray.
