IMAGEPERSP — Correct perspective

Corrects the perspective of an image (IFIX style) with 4 points and generates its world file.

• Command: IMAGEPERSP · Global name: _IMAGEPERSP · Alias: IFIX
• Ribbon: Insert › Image and tracing

Corrects the perspective of a raster image (IFIX style): with 4 points it straightens a quadrilateral into a rectangle, for example a façade or a plan photographed at an angle. The result is saved to a new PNG file with its world file (.wld), next to the original (which is not touched), and the drawing image is relinked to it.

Usage

1. Enter IMAGEPERSP (or IFIX) or click the button.
2. Select the image.

Select the image whose perspective to correct:

3. Specify the 4 corners of what should become rectangular, in order: lower left, lower right, upper right and upper left.

Specify corner … of 4 (lower left, lower right, upper right, upper left):

Notes

• The straightened image is placed axis-aligned, with the lower-left corner at the first point.
• The world file (.wld) records the position and scale for GIS programs and for GEOIMAGE.
• The original file is not changed: the result goes to a new file <name>-ed.png.

See also

IMAGEEDIT · IMAGECROP · GEOIMAGE · GEOREFIMAGE · Raster images