Use brush at low opacity if you want to build up (watercolor effect). Set layer to low opacity if you want lighter, but uniform, tint.
An alternative, more flexible way is to make a finished selection/mask and save that. Then you can later do whatever you want inside the selection/mask.
There is no (direct) way that a brush without 100% opacity works not additive, right?
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You can always use the brush at 100%, but on a layer set to lower opacity. If I understand this correctly it should do what you want.
It should look like 1 stepless painting but if I interrupt a painting at one point I can not stichless paint on with reduced opacity and there is a visible "step" in contrast.
(I use PS usually for (technical) Illustration and for MAYA.)
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Yes, that's what I'm saying. Paint at 100%, not at reduced opacity.
The layer itself is at reduced opacity. This way there is no visible stitching between strokes.
I hoped for a more elegant methode but if this is the standard methode. Ok. Thanks.