I'm reading "The DC Comics Guide to DIGITALLY DRAWING Comics" by Freddie 
E Williams II.  In it he talks about a workflow where he does a rough 
sketch, puts an adjustment layer over it with Hue: 200 Saturation: 60 
Lightness+75, that makes the underlying rough sketch look like a 
non-photo blue pencil sketch.  Then he refines the drawing, pops another 
adjustment layer over it, and continues the process until he's happy.  
Older versions get progressively pushed into the background in a 
non-destructive way, although when he gets to the version he's happy 
with he can delete all of the intermediate ones.  They're just steps in 
the process.

Now GIMP doesn't have adjustment layers and although they're a 
frequently requested thing, unless someone with time and expertise steps 
up to do the development, the current team has their hands full with 
other priorities for quite some time.  The move to gegl is more 
important, and I'm sure would make this easier to implement.  So, I'm 
not holding my breath.

What I'm looking for is a substitute.  Preferably a non-destructive 
one.  I can turn down the opacity of layers gradually as they recede 
into the drawing past, but that's annoying.  Alternatively, there's the 
Hue Saturation Lightness tool, but I have no idea how to reproduce those 
settings.  The numbers on that tool (assuming the master is chosen) have 
no relationship to the numbers used in PS.

The Colorize tool seems more hopeful, you can enter those numbers into 
the tool and it looks similar to what you want.  Of course it doesn't 
affect any but that layer, so stacking them to progressively decrease 
the visibility of the underlying older versions doesn't help.  You'd 
still have to go into each of the older layers and manually decrease 
their opacity.

Anyone have any better ideas?

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