Opacity and Flow

Opacity and flow are parameters for the transparency of a brush.

../../../_images/Krita_Pixel_Brush_Settings_Flow.png

They are interlinked with the painting mode setting.

../../../_images/Krita_2_9_brushengine_opacity-flow_02.png
Opacity
The transparency of a stroke.
Flow
The transparency of separate dabs. Finally separated from Opacity in 2.9
../../../_images/Krita_2_9_brushengine_opacity-flow_01.png

Painting mode

Build-up
Will treat opacity as if it were the same as flow.
Wash
Will treat opacity as stroke transparency instead of dab-transparency.
../../../_images/Krita_2_9_brushengine_opacity-flow_03.png

where the other images of this page had all three strokes set to painting mode: wash, this one is set to build-up.