Krita script to change filled shape to an outline that is easily refillable. Meant to make fixing animation spacing easier with the onion skin docker.

unfillShape.py

from krita import *
#A script to cut out the center of a filled shape so that you can see spacing better with the onion skin docker.
#Go to the frame and layer you want run the script and your left with an outline that you can see properly in the onion skin
#Just fill it back up when your done with the bucket tool

##------IMPORTANT!!!!!--------## Make sure onion skin opacity is less than 95% ish

#TIP: when refilling set your bucket tool to grow by 1px ish to get rid of any artifacts
#To add it to your project just go to tools -> scripts -> ten scripts-> click the elipse next to the hot key you want
#-> navigate to the script and your done!
def unfill_layer( stroke_weight = 5 ):
    doc=Krita.instance().activeDocument()
    if doc: 
    	node=doc.activeNode()
    else:
    	return
    
    x,y,w,h = node.bounds().left(), node.bounds().top(), node.bounds().width(), node.bounds().height()
    pixels=node.projectionPixelData(x,y,w,h)
    
    rgba = 0
    pixelBytes=[]
    for i in range(w*h):
        if pixels[rgba + 3] > int(250).to_bytes(1,'big'):
            pixelBytes.append(255)
        else:
            pixelBytes.append(0)   
        rgba+=4 
    selection = Selection()
    selection.setPixelData(QByteArray(bytes(pixelBytes)),x,y,w,h)
    
    for i in range(stroke_weight):
        selection.erode()
        
    doc.setSelection(selection)
    selection.cut(node) 
    doc.setSelection(Selection().clear())
    doc.refreshProjection()


stroke = 5  #<----------Changes width of left over outline    
unfill_layer(stroke_weight = stroke)