Is there a cloning brush/option in painter that works on a layer without replacing the transparent areas with the canvas colour? (Similar to the PS clone stamp tool when selecting just the current layer)
If you re looking to paint from a layer that has transparency there is a way, but it needs a tiny bit of extra work and has some real limitations:
Use the attached brush and follow these steps:
1) In the source layer right click the layer and choose "select layer content"
2) Clone into your new document as usual
The limitation is: it must be a hard cloner -- soft dab edges will reveal a black artifact.
Layer Straight Cloner.zip
look at this video, it tells it all: