I've been making a couple of pencil illustrations and scanning them into photoshop, just the line art - no rendering or shading, just simple outlines of shapes.
I then use photoshop to colour the lines digitally (first by treating the contrast/levels on the line art itself to make it a little bolder, then by setting the line art layer blending option to "Multiply" and colouring on layers beneath the line art one).
Now, I am using this method (instead of making the line art with a tablet) to preserve the tangible, naturally textured feel of the illustrations - however; I am running into two problems.
> The 'Multiply' blending option seems to take anything that isn't 100% black and make it transparent to a certain degree (opacity varying, depending on the colour's proximity to 100% black). This means that through my grey pencil lines, which are separating two different colours - you can see the border between the coloured sections, instead of the border being neatly obscured by the pencil line.
> I also would like to colour the lines themselves, but the more colour I add - the more transparent they tend to become (as many of the line colours I have in mind are quite light). I would trace around the lines, and then fill over them - but this would defeat the idea of having that nice gritty pencil texture to it.
Wait... ...I just thought maybe if I put a coloured trace of the line, directly below to Multiplied line art' layer - that might help. Perhaps if I lower the opacity on the line art layer also.
Might work, might not. In the mean time, while I am experimenting - does anyone have any better ways of doing it? (In case my way fails miserably!).