Rosie J

Ah, thanks! I will try that! (And it's "anti aliasing"? I thought it was one word pronounced "an-she-a-lie-zing". Anti Aliasing makes a lot more sense, haha)

Thanks, but as I don't have a tablet, Lasso is very unpredictable. Trying to accurately outline, say, an eye I've drawn with the mouse has not yielded good results. I've been fiddling with the Magic Wand's Tolerance using the + and - buttons, which seems to have helped a lot.

When I make lineart, I often use the Magic Wand tool to select the lines themselves if I want to move part of the lineart without erasing and redrawing. The default Tolerance (50%) does not work; it selects only the darkest pixels in the lines and leaves behind a grayish shadow on either side of the line's former location. I am using the Line/Curve tool set to Spline for most of the lineart, and my Paintbrush is set at maximum Hardness, but there appears to be no way to get a perfectly black and white image with the Line/Curve tool. (I don't have a functional tablet and stylus at the moment, so the Pencil tool is mostly useless to me at this time.) "Not a problem," I thought. "I'll just set the Tolerance higher so Magic Wand will grab the whole line, not just the middle of it." Which I did. And then I noticed something very strange. The Magic Wand selected all the lines I'd drawn, as I expected. It also selected what appeared to be every stroke of the Eraser tool that I had used when making the lineart. All over the image were invisible brushstrokes, outlined in the 'marching ants' selection, that I recognized as being where I had erased lines that I hadn't been able to move. I double checked that my eraser's Hardness and Opacity were set to maximum, they had been all along. I had used the eraser set to (I think) 5 pixels, while all the lines had been drawn with the Line/Curve tool set to 2 pixels. It appeared that the eraser tool was leaving smudges of not-quite-transparent pixels wherever I used it--pixels the Magic Wand could see but I couldn't. Setting my eraser size larger (13 pixels if I recall right) seems to have gotten rid of these smudges. In hindsight I realize I should have taken a screenshot before doing so, but I found an area that still had some smudging in places with too many lines too close together to use the 13-pixel-wide eraser and took two screenshots (attached): one of the image as it appeared to me and one with Magic Wand used on the lines at somewhere between 60 and 85% tolerance. In a nutshell, the problem appears to be that the eraser, even set to 100% Hardness and 255 Opacity (Alpha), is not completely erasing pixels where it is used, at least when it is less than ten pixels wide.