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167
168<div class="main">
169
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]170<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
171
172<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
173_8c.html" target="source" name="DistortImage">DistortImage</a></h2>
174<div class="doc-section">
175
176<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>
177
178<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>
179
180<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>
181
182<p>The format of the DistortImage() method is:</p>
183
184<pre class="code">
185 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]186 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187 MagickBooleanType bestfit, ExceptionInfo *exception)
188</pre>
189
190<p>A description of each parameter follows:</p></ol>
191
192<h5>image</h5>
193<ol><p>the image to be distorted.</p></ol>
194
195<h5>method</h5>
196<ol><p>the method of image distortion.</p></ol>
197
198<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>
199
200<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>
201
202<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>
203
204<h5>number_arguments</h5>
205<ol><p>the number of arguments given.</p></ol>
206
207<h5>arguments</h5>
208<ol><p>an array of floating point arguments for this method.</p></ol>
209
210<h5>bestfit</h5>
211<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>
212
213<h5>exception</h5>
214<ol><p>return any errors or warnings in this structure</p></ol>
215
216<p>Extra Controls from Image meta-data (artifacts)...</p></ol>
217
218<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>
219
220<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>
221
222<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>
223
224<p>Other settings that can effect results include</p></ol>
225
226<p>o 'interpolate' For source image lookups (scale enlargements)</p></ol>
227
228<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>
229
230 </div>
231<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
232_8c.html" target="source" name="SparseColorImage">SparseColorImage</a></h2>
233<div class="doc-section">
234
235<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p></ol>
236
237<p>The format of the SparseColorImage() method is:</p>
238
239<pre class="code">
240 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]241 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242 const double *arguments,ExceptionInfo *exception)
243</pre>
244
245<p>A description of each parameter follows:</p></ol>
246
247<h5>image</h5>
248<ol><p>the image to be filled in.</p></ol>
249
250<h5>channel</h5>
251<ol><p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p></ol>
252
253<h5>method</h5>
254<ol><p>the method to fill in the gradient between the control points.</p></ol>
255
256<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>
257
258<h5>number_arguments</h5>
259<ol><p>the number of arguments given.</p></ol>
260
261<h5>arguments</h5>
262<ol><p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p></ol>
263
264<h5>exception</h5>
265<ol><p>return any errors or warnings in this structure</p></ol>
266
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