Halftone Image From Greyscale Image Tutorial
I think this might be scriptable if anybody wants to try to do it.
1. Start off with a greyscale image. If you have a color image then do a [Color] [Desaturate] on it first. And then create another layer above it that is all black canvas area. And change the layer mode to Dodge.
2. On the black dodge layer run the [Filter} [Render] [Patterns] [Grid] filter on it. In the grid dialog choose a width for Horizontal and verticle lines of 1 to 4 or so. Choose the spacing between the lines at perhaps 10 to 20. And make the color of the lines white, and click OK.
Now Gausian blur the dodge layer to kind of round off the squares, followed by a [Color] [Auto] [Stretch Contrast] to force the colors to stretch from full black to full white.
4. Then do a [Layer] [New From Visible] and run the [Color] [Threshold] filter on it by moving the slider to the right.
Since this is all being done manually it gives a lot of room for adjustment. You can try to invert one of the layers. You can also use a filter like [Distorts] [Curve Bend] or [iWarp]. Curves can also be used on the layers to make things thicker or thinner in the results. You can also try this with other settings inside of the [Grid] dialog box. You can use the [Grid] ddialog to create only verticle or only horizontal lines etc.
Pegleg