01-31-2018, 11:08 PM
OTOH, if you "really" had to thin some thick lines, it might be done by subtracting one selection from another.
Let's say you have a drawing with 5px-wide lines. Select the outside edge of the figure, shrink it by 3 px, and save the selection to a path, say, "Minus3." Do the same with a path shrunk only 2px, saved to "Minus2."
On the Paths tab, right-click on the Minus2 path and choose Path-to-Selection. Then right-click Minus3 and "Subtract from Selection", leaving, theoretically at least, a 1 px interior. Invert the selection and hit delete key to get rid of the unselected fat parts.
(I like to start from outside and shrink, rather than inside and grow, because the former tends to preserve detail, while the latter doesn't know what to do at sharp corners, so rounds them.)
Let's say you have a drawing with 5px-wide lines. Select the outside edge of the figure, shrink it by 3 px, and save the selection to a path, say, "Minus3." Do the same with a path shrunk only 2px, saved to "Minus2."
On the Paths tab, right-click on the Minus2 path and choose Path-to-Selection. Then right-click Minus3 and "Subtract from Selection", leaving, theoretically at least, a 1 px interior. Invert the selection and hit delete key to get rid of the unselected fat parts.
(I like to start from outside and shrink, rather than inside and grow, because the former tends to preserve detail, while the latter doesn't know what to do at sharp corners, so rounds them.)