I am using krita with only one layer, and try to figure out how Krita blend. so the layer is set to normal and only one layer.
If set the layer filled with green(0,255,0,255) and then use an ink pen, this pen has a soft edge(which is a transparent in my opinion and from the specific color board, in the specific color board there are only r,g,b but not a, so I am not sure what the a is, here I assume it is less than 255 since if I use pick up on that edge, the color I picked is the same as I picked in the center.)
but if I use the same ink pen and draw on the original region, there are not transparency there. So I dont understand how Krita blend the color:
Equation1: src * F_src + target * (1-F_src),
if Krita use this one, that means if target has a =255(or 1.0) ,the result a would be less than 255 if F_src < 1.0 .But this is not the same as I see(as I described before).
So I just want to know the formula(equation) Krita used for its blending in the same layer(with attribute = normal).
The opacity of a brush is manually controlled by the Opacity slider on the Toolbar and also by the brushtip image of whatever brush preset you are using.
Without knowing the exact name of the brush preset you are using then it’s difficult to investigate this.
It would be helpful and useful, for anyone who tries to give you help and advice, to show a full screen screenshot that includes the effect you describe on the canvas and the Layers docker
And by the Flow setting in addition to the pen pressure if the pen and the brush preset support pressure and pressure is used for opacity/flow.
So many factors to take into account 