Plugins for perspective drawing in GIMP
Copyright (C) 2015 Asher Blum
http://wildsparx.com/gimp-perspective/
On Linux and Mac, find your gimp plugins directory, such as ~/gimp-2.8/plug-ins
cp *.py ~/gimp-2.8/plug-ins
restart gimp
Draws ellipses to represent horizontal circles. Can also draw vertical lines to complete a wireframe of a vertical cylinder such as a round tower.
- Ellipses are proportioned based on distance from horizon line.
- Draw a horizon line across your image; note the y-coordinate
- Set the brush and foreground color for the ellipses you want.
- Use the rectangle select tool to draw the major axis of the ellipse
- The top line of the rectangle becomes the major axis
- The rest of the rectangle doesn't matter - keep it short vertically
- Choose Tools/Perspective/Ellipses
- Enter the height of your horizon line in "Horizon Height"
- Click OK
- The plugin creates a new layer with one ellipse on it.
- Use the rectangle select tool to draw the major axis of the first ellipse
- Put the select tool in "Add" mode
- Add more rectangles to the selection
- Call the plugin - same as for a single ellipse
- Use the rectangle select tool to select the whole cylinder as a rectangle
- Choose Tools/Perspective/Ellipses
- Set vertical spacing to about 1/10 the height of the cylinder
- Set "Draw vertical lines" to Yes
- Click OK
- Use just once while setting up drawing
- Set the brush size and hardness, for example size 4, hardness 50
- Choose Tools/Perspective/Grid
- Set the vanishing points off the canvas an appropriate amount
- Set the horizon height to where you want the horizon line - use the scale at the left edge of the canvas.
- Click OK
Extracts the perspective grid from an existing image