Hi,

I was wondering if you could implement a "behind" drawing mode, where each stroke is only applied behind the drawing (actually where alpha is not fully opaque). This feature can be useful, for example, to quickly color a sketch or artline directly on the same layer.

Also a "Onto" drawing mode would be useful, which let paint only on already painted area (without having to select from alpha)
(Of course those two mode are only useful when painting on a transparent layer, on a white one everything is already filled so they are useless.)

Also those modes could be used in layer composite mode too, I can see "Onto" very useful (although I don't see how behind could be useful in Krita's layer yet but someone could need it).

Another interesting layer mode in Synfig is "Straight onto": it makes this layer visible only on filled/drawing areas from layers under it, and the part of those layer under which aren't covered become invisible. I think this one could be added as layer mode, but maybe not as painting mode.

What do you think about it?

Hm... I'm not sure I get your first suggestion: wouldn't painting on a layer below the sketch layer work for that?

The onto drawing mode should already work: you can click the alpha lock icon in the layerbox and then you can only draw where there are already non-alpha pixels.

I have to meditate a bit on the rest of them .

Yes in a way to draw on a layer below would have the same effect, but not really.
Behind drawing is a way to preserve previous strokes while still working on the same layer, stroke after stroke (so actually to get the same result with layers you should add a layer down after each stroke… !)

For the onto painting mode, I know the Alpha lock does the same. Except you have to lock each layer when you toggle from one to the other, while a painting mode would act on any layer with a single click.
(Anyway for the Onto layer mode, nothing does the same yet in Krita)


These aren't a priority as, as you said, most can be done in other way, but they can improve productivity (and then also let do things we can't yet!).

Another option that could be added to each layer is a "stencil" on/revert/off setting (to use stencil combinations from several layers to paint on one).

-"On": Opaque areas are active
-"Revert": Transparent areas are active
-"Off" no stencil from this layer

Is it possible?