1 2 3 4 5 <!DOCTYPE html> 6 <html lang="en"> 7 <head> 8 <title>ImageMagick: MagickCore, C API for ImageMagick: Image Distortions</title> 9 <meta charset="utf-8" /> 10 <meta http-equiv="X-UA-Compatible" content="IE=edge" /> 11 <meta name="viewport" content="width=device-width, initial-scale=1" /> 12 <meta http-equiv="content-type" content="text/html; charset=utf-8"/> 13 <meta name="application-name" content="ImageMagick"/> 14 <meta name="description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. 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It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p> 64 65 <p>The format of the AffineTransformImage method is:</p> 66 67 <pre class="text"> 68 Image *AffineTransformImage(const Image *image, 69 AffineMatrix *affine_matrix,ExceptionInfo *exception) 70 </pre> 71 72 <p>A description of each parameter follows:</p> 73 74 <dd> 75 </dd> 76 77 <dd> </dd> 78 <dl class="dl-horizontal"> 79 <dt>image</dt> 80 <dd>the image. </dd> 81 82 <dd> </dd> 83 <dt>affine_matrix</dt> 84 <dd>the affine matrix. </dd> 85 86 <dd> </dd> 87 <dt>exception</dt> 88 <dd>return any errors or warnings in this structure. </dd> 89 90 <dd> </dd> 91 </dl> 92 <h2><a href="http://www.imagemagick.org/api/MagickCore/distort_8c.html" id="DistortImage">DistortImage</a></h2> 93 94 <p>DistortImage() distorts an image using various distortion methods, by mapping color lookups of the source image to a new destination image usally of the same size as the source image, unless 'bestfit' is set to true.</p> 95 96 <p>If 'bestfit' is enabled, and distortion allows it, the destination image is adjusted to ensure the whole source 'image' will just fit within the final destination image, which will be sized and offset accordingly. Also in many cases the virtual offset of the source image will be taken into account in the mapping.</p> 97 98 <p>If the '-verbose' control option has been set print to standard error the equicelent '-fx' formula with coefficients for the function, if practical.</p> 99 100 <p>The format of the DistortImage() method is:</p> 101 102 <pre class="text"> 103 Image *DistortImage(const Image *image,const DistortMethod method, 104 const size_t number_arguments,const double *arguments, 105 MagickBooleanType bestfit, ExceptionInfo *exception) 106 </pre> 107 108 <p>A description of each parameter follows:</p> 109 110 <dd> 111 </dd> 112 113 <dd> </dd> 114 <dl class="dl-horizontal"> 115 <dt>image</dt> 116 <dd>the image to be distorted. </dd> 117 118 <dd> </dd> 119 <dt>method</dt> 120 <dd>the method of image distortion. </dd> 121 122 <dd> ArcDistortion always ignores source image offset, and always 'bestfit' the destination image with the top left corner offset relative to the polar mapping center. </dd> 123 124 <dd> Affine, Perspective, and Bilinear, do least squares fitting of the distrotion when more than the minimum number of control point pairs are provided. </dd> 125 126 <dd> Perspective, and Bilinear, fall back to a Affine distortion when less than 4 control point pairs are provided. While Affine distortions let you use any number of control point pairs, that is Zero pairs is a No-Op (viewport only) distortion, one pair is a translation and two pairs of control points do a scale-rotate-translate, without any shearing. </dd> 127 128 <dd> </dd> 129 <dt>number_arguments</dt> 130 <dd>the number of arguments given. </dd> 131 132 <dd> </dd> 133 <dt>arguments</dt> 134 <dd>an array of floating point arguments for this method. </dd> 135 136 <dd> </dd> 137 <dt>bestfit</dt> 138 <dd>Attempt to 'bestfit' the size of the resulting image. This also forces the resulting image to be a 'layered' virtual canvas image. Can be overridden using 'distort:viewport' setting. </dd> 139 140 <dd> </dd> 141 <dt>exception</dt> 142 <dd>return any errors or warnings in this structure </dd> 143 144 <dd> Extra Controls from Image meta-data (artifacts)... </dd> 145 146 <dd> o "verbose" Output to stderr alternatives, internal coefficents, and FX equivalents for the distortion operation (if feasible). This forms an extra check of the distortion method, and allows users access to the internal constants IM calculates for the distortion. </dd> 147 148 <dd> o "distort:viewport" Directly set the output image canvas area and offest to use for the resulting image, rather than use the original images canvas, or a calculated 'bestfit' canvas. </dd> 149 150 <dd> o "distort:scale" Scale the size of the output canvas by this amount to provide a method of Zooming, and for super-sampling the results. </dd> 151 152 <dd> Other settings that can effect results include </dd> 153 154 <dd> o 'interpolate' For source image lookups (scale enlargements) </dd> 155 156 <dd> o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead </dd> 157 158 <dd> </dd> 159 </dl> 160 <h2><a href="http://www.imagemagick.org/api/MagickCore/distort_8c.html" id="RotateImage">RotateImage</a></h2> 161 162 <p>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.</p> 163 164 <p>The format of the RotateImage method is:</p> 165 166 <pre class="text"> 167 Image *RotateImage(const Image *image,const double degrees, 168 ExceptionInfo *exception) 169 </pre> 170 171 <p>A description of each parameter follows.</p> 172 173 <dt>image</dt> 174 <p>the image.</p> 175 176 <dt>degrees</dt> 177 <p>Specifies the number of degrees to rotate the image.</p> 178 179 <dt>exception</dt> 180 <p>return any errors or warnings in this structure.</p> 181 182 <h2><a href="http://www.imagemagick.org/api/MagickCore/distort_8c.html" id="SparseColorImage">SparseColorImage</a></h2> 183 184 <p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p> 185 186 <p>The format of the SparseColorImage() method is:</p> 187 188 <pre class="text"> 189 Image *SparseColorImage(const Image *image, 190 const SparseColorMethod method,const size_t number_arguments, 191 const double *arguments,ExceptionInfo *exception) 192 </pre> 193 194 <p>A description of each parameter follows:</p> 195 196 <dd> 197 </dd> 198 199 <dd> </dd> 200 <dl class="dl-horizontal"> 201 <dt>image</dt> 202 <dd>the image to be filled in. </dd> 203 204 <dd> </dd> 205 <dt>method</dt> 206 <dd>the method to fill in the gradient between the control points. </dd> 207 208 <dd> The methods used for SparseColor() are often simular to methods used for DistortImage(), and even share the same code for determination of the function coefficents, though with more dimensions (or resulting values). </dd> 209 210 <dd> </dd> 211 <dt>number_arguments</dt> 212 <dd>the number of arguments given. </dd> 213 214 <dd> </dd> 215 <dt>arguments</dt> 216 <dd>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values. </dd> 217 218 <dd> </dd> 219 <dt>exception</dt> 220 <dd>return any errors or warnings in this structure </dd> 221 222 <dd> </dd> 223 </dl> 224 </div> 225 <footer class="magick-footer"> 226 <p><a href="../support.html">Donate</a> 227 <a href="../sitemap.html">Sitemap</a> 228 <a href="../links.html">Related</a> 229 <a href="../architecture.html">Architecture</a> 230 </p> 231 <p><a href="distort.html#">Back to top</a> 232 <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> 233 <a href="http://www.imagemagick.org/script/contact.php">Contact Us</a></p> 234 <p><small> 1999-2016 ImageMagick Studio LLC</small></p> 235 </footer> 236 </div><!-- /.container --> 237 238 <script src="https://localhost/ajax/libs/jquery/1.11.3/jquery.min.js"></script> 239 <script src="../js/magick.html"></script> 240 </div> 241 </body> 242 </html> 243
