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It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p> 95 96<p>The format of the AffineTransformImage method is:</p> 97 98<pre class="text"> 99Image *AffineTransformImage(const Image *image, 100 AffineMatrix *affine_matrix,ExceptionInfo *exception) 101</pre> 102 103<p>A description of each parameter follows:</p> 104 105<dd> 106</dd> 107 108<dd> </dd> 109<dl class="dl-horizontal"> 110<dt>image</dt> 111<dd>the image. </dd> 112 113<dd> </dd> 114<dt>affine_matrix</dt> 115<dd>the affine matrix. </dd> 116 117<dd> </dd> 118<dt>exception</dt> 119<dd>return any errors or warnings in this structure. </dd> 120 121<dd> </dd> 122</dl> 123<h2><a href="../../api/MagickCore/distort_8c.html" id="DistortImage">DistortImage</a></h2> 124 125<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> 126 127<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> 128 129<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> 130 131<p>The format of the DistortImage() method is:</p> 132 133<pre class="text"> 134Image *DistortImage(const Image *image,const DistortMethod method, 135 const size_t number_arguments,const double *arguments, 136 MagickBooleanType bestfit, ExceptionInfo *exception) 137</pre> 138 139<p>A description of each parameter follows:</p> 140 141<dd> 142</dd> 143 144<dd> </dd> 145<dl class="dl-horizontal"> 146<dt>image</dt> 147<dd>the image to be distorted. </dd> 148 149<dd> </dd> 150<dt>method</dt> 151<dd>the method of image distortion. </dd> 152 153<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> 154 155<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> 156 157<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> 158 159<dd> </dd> 160<dt>number_arguments</dt> 161<dd>the number of arguments given. </dd> 162 163<dd> </dd> 164<dt>arguments</dt> 165<dd>an array of floating point arguments for this method. </dd> 166 167<dd> </dd> 168<dt>bestfit</dt> 169<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> 170 171<dd> </dd> 172<dt>exception</dt> 173<dd>return any errors or warnings in this structure </dd> 174 175<dd> Extra Controls from Image meta-data (artifacts)... </dd> 176 177<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> 178 179<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> 180 181<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> 182 183<dd> Other settings that can effect results include </dd> 184 185<dd> o 'interpolate' For source image lookups (scale enlargements) </dd> 186 187<dd> o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead </dd> 188 189<dd> </dd> 190</dl> 191<h2><a href="../../api/MagickCore/distort_8c.html" id="RotateImage">RotateImage</a></h2> 192 193<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> 194 195<p>The format of the RotateImage method is:</p> 196 197<pre class="text"> 198Image *RotateImage(const Image *image,const double degrees, 199 ExceptionInfo *exception) 200</pre> 201 202<p>A description of each parameter follows.</p> 203 204<dt>image</dt> 205<p>the image.</p> 206 207<dt>degrees</dt> 208<p>Specifies the number of degrees to rotate the image.</p> 209 210<dt>exception</dt> 211<p>return any errors or warnings in this structure.</p> 212 213<h2><a href="../../api/MagickCore/distort_8c.html" id="SparseColorImage">SparseColorImage</a></h2> 214 215<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p> 216 217<p>The format of the SparseColorImage() method is:</p> 218 219<pre class="text"> 220Image *SparseColorImage(const Image *image, 221 const SparseColorMethod method,const size_t number_arguments, 222 const double *arguments,ExceptionInfo *exception) 223</pre> 224 225<p>A description of each parameter follows:</p> 226 227<dd> 228</dd> 229 230<dd> </dd> 231<dl class="dl-horizontal"> 232<dt>image</dt> 233<dd>the image to be filled in. </dd> 234 235<dd> </dd> 236<dt>method</dt> 237<dd>the method to fill in the gradient between the control points. </dd> 238 239<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> 240 241<dd> </dd> 242<dt>number_arguments</dt> 243<dd>the number of arguments given. </dd> 244 245<dd> </dd> 246<dt>arguments</dt> 247<dd>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values. </dd> 248 249<dd> </dd> 250<dt>exception</dt> 251<dd>return any errors or warnings in this structure </dd> 252 253<dd> </dd> 254</dl> 255</div> 256 </div> 257 </main><!-- /.container --> 258 <footer class="magick-footer"> 259 <p><a href="../../www/www/security-policy.html">Security</a> • 260 <a href="../../www/www/architecture.html">Architecture</a> 261 262 <a href="distort.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../../www/images/wand.ico"/></a> 263 264 <a href="../../www/www/links.html">Related</a> • 265 <a href="../../www/www/sitemap.html">Sitemap</a> 266 <br/> 267 <a href="../../www/www/support.html">Donate</a> • 268 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 269 <a href="../../www/www/contact.html">Contact Us</a> 270 <br/> 271 <small>© 1999-2020 ImageMagick Studio LLC</small></p> 272 </footer> 273 274 <!-- Javascript assets --> 275 <script src="../../www/assets/magick.js" crossorigin="anonymous"></script> 276 <script>window.jQuery || document.write('<script src="https://localhost/ajax/libs/jquery/3.4.1/jquery.min.js"><\/script>')</script> 277</body> 278</html> 279<!-- Magick Cache 1st January 2020 09:56 -->
