Try this-

After you have a rough sketch, create a new layer filled with Hue: 200
Saturation: 60 Lightness 75 below your sketch layer and set your
sketch layer blend mode to screen.  Your image will now look like it
is drawn in non photo blue.

Create a new white layer on top and set the mode to multiply and
sketch over using black.

When happy with that layer, change its mode to screen and move the
blue layer below it.

Repeat and rinse.

-Rob A>

On Mon, Jan 31, 2011 at 5:06 PM, Patrick Horgan <> wrote:
> 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?
> Patrick
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