[
About ImageMagick
Command-line Tools
Program Interfaces
] [ Install from Source Binary Releases Resources ] [ Download ] [ Links ] [ Sponsors Server Administration Support Forum ] |
AffineTransformImage() transforms an image as dictated by the affine matrix. It allocates the memory necessary for the new Image structure and returns a pointer to the new image. The format of the AffineTransformImage method is: Image *AffineTransformImage(const Image *image,AffineMatrix *affine, ExceptionInfo *exception) A description of each parameter follows: imageThe image. affineThe affine transform. exceptionReturn any errors or warnings in this structure. RotateImage() creates a new image that is a rotated copy of an existing one. Positive angles rotate counter-clockwise (right-hand rule), while negative angles rotate clockwise. Rotated images are usually larger than the originals and have 'empty' triangular corners. X axis. Empty triangles left over from shearing the image are filled with the background color defined by member 'background_color' of the image. RotateImage allocates the memory necessary for the new Image structure and returns a pointer to the new image. RotateImage() is based on the paper "A Fast Algorithm for General Raster Rotatation" by Alan W. Paeth. RotateImage is adapted from a similar method based on the Paeth paper written by Michael Halle of the Spatial Imaging Group, MIT Media Lab. The format of the RotateImage method is: Image *RotateImage(const Image *image,const double degrees, ExceptionInfo *exception) A description of each parameter follows. imageThe image. degreesSpecifies the number of degrees to rotate the image. exceptionReturn any errors or warnings in this structure. ShearImage() creates a new image that is a shear_image copy of an existing one. Shearing slides one edge of an image along the X or Y axis, creating a parallelogram. An X direction shear slides an edge along the X axis, while a Y direction shear slides an edge along the Y axis. The amount of the shear is controlled by a shear angle. For X direction shears, x_shear is measured relative to the Y axis, and similarly, for Y direction shears y_shear is measured relative to the X axis. Empty triangles left over from shearing the image are filled with the background color defined by member 'background_color' of the image.. ShearImage() allocates the memory necessary for the new Image structure and returns a pointer to the new image. ShearImage() is based on the paper "A Fast Algorithm for General Raster Rotatation" by Alan W. Paeth. The format of the ShearImage method is: Image *ShearImage(const Image *image,const double x_shear, const double y_shear,ExceptionInfo *exception) A description of each parameter follows. imageThe image. x_shear, y_shearSpecifies the number of degrees to shear the image. exceptionReturn any errors or warnings in this structure. |