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169
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame^]170<h1>Module distort
171 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]172<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
173
174<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
175_8c.html" target="source" name="DistortImage">DistortImage</a></h2>
176<div class="doc-section">
177
178<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></ol>
179
180<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></ol>
181
182<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></ol>
183
184<p>The format of the DistortImage() method is:</p>
185
186<pre class="code">
187 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]188 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]189 MagickBooleanType bestfit, ExceptionInfo *exception)
190</pre>
191
192<p>A description of each parameter follows:</p></ol>
193
194<h5>image</h5>
195<ol><p>the image to be distorted.</p></ol>
196
197<h5>method</h5>
198<ol><p>the method of image distortion.</p></ol>
199
200<p>ArcDistortion always ignores source image offset, and always 'bestfit' the destination image with the top left corner offset relative to the polar mapping center.</p></ol>
201
202<p>Affine, Perspective, and Bilinear, do least squares fitting of the distrotion when more than the minimum number of control point pairs are provided.</p></ol>
203
204<p>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.</p></ol>
205
206<h5>number_arguments</h5>
207<ol><p>the number of arguments given.</p></ol>
208
209<h5>arguments</h5>
210<ol><p>an array of floating point arguments for this method.</p></ol>
211
212<h5>bestfit</h5>
213<ol><p>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.</p></ol>
214
215<h5>exception</h5>
216<ol><p>return any errors or warnings in this structure</p></ol>
217
218<p>Extra Controls from Image meta-data (artifacts)...</p></ol>
219
220<p>o "verbose" Output to stderr alternatives, internal coefficents, and FX equivelents 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.</p></ol>
221
222<p>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.</p></ol>
223
224<p>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.</p></ol>
225
226<p>Other settings that can effect results include</p></ol>
227
228<p>o 'interpolate' For source image lookups (scale enlargements)</p></ol>
229
230<p>o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead</p></ol>
231
232 </div>
233<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
234_8c.html" target="source" name="SparseColorImage">SparseColorImage</a></h2>
235<div class="doc-section">
236
237<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p></ol>
238
239<p>The format of the SparseColorImage() method is:</p>
240
241<pre class="code">
242 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]243 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244 const double *arguments,ExceptionInfo *exception)
245</pre>
246
247<p>A description of each parameter follows:</p></ol>
248
249<h5>image</h5>
250<ol><p>the image to be filled in.</p></ol>
251
252<h5>channel</h5>
253<ol><p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p></ol>
254
255<h5>method</h5>
256<ol><p>the method to fill in the gradient between the control points.</p></ol>
257
258<p>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).</p></ol>
259
260<h5>number_arguments</h5>
261<ol><p>the number of arguments given.</p></ol>
262
263<h5>arguments</h5>
264<ol><p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p></ol>
265
266<h5>exception</h5>
267<ol><p>return any errors or warnings in this structure</p></ol>
268
269 </div>
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