Variations on Gimp's Perspective Transform tool:
different user interfaces. These plugins work on the active layer.
Currently there are three plugins. To get them, do:
- At the bottom of this page there is a Download button. Clicking you
get one .ZIP file. Unzip it and put the python file it contains in
your Gimp's plug-ins folder and restart Gimp.
- This registers in your Gimp the plugins.
- The place of the plugins in Gimp's menu is Filters>Distorts>Perspective
transform>... For an example and more detailed
explanations, see www.gimp-forum.net.
- Perspective transform - 4 points to 4 points takes as input
two paths, the Source and the Target, each having 4 anchors. The
transformation is the one which sends the anchors of the Source onto
the anchors of the Target, and distorting the whole picture
- Perspective transform - 4 points to circle (clock face) is
designed to correct a distorted circle (an ellipse) to a true circle.
It takes as input one path, the Source, having 4 anchors (meant to be
4 points on the distorted circle), and a list of 4 hours on an
imaginary clock face. It sends the 4 anchors of the Source to
corresponding hours on a circle.
- Perspective transform - 4 points to rectangle corners is
designed to correct quadrangles to rectangles. It takes as input one
path, the Source, having 4 anchors. The Target is a rectangle with
sides horizontal and vertical; the user can choose between three
alternatives (the default is automatic requiring no input from the
user). The region inside the Source path will be mapped onto the
Target rectangle, the anchors going to the corners.
- Perspective transform - 2+2+2 points to circle (3 diameters)
is designed to correct a distorted circle (an ellipse) to a true
circle. The main input is three paths, each with two anchors, each
showing one would-be diameter of the circle. The diameters have end
points on the distorted circle and they pass through the point that
should become the center of the circle. A fourth input path is used to
determine direction (rotation) of the resulting picture.
- Perspective transform - 1+2+3 points to circle (center and 2+3
points) is designed to correct a distorted circle (an ellipse)
to a true circle. As input it takes one path with three strokes, one
with 1 anchor, one with 2 anchor, and one with 3 anchors. The 1-anchor
path has as its sole anchor that point which should become the center
of the corrected circle. The 2-anchors path has as its anchors two
points on the distorted circle (and they are also used to determine to
which position the resulting circle should be rotated). The 3-anchors
path has as its anchors three other points on the distorted circle.