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173
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]174<h1>Module distort
175 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]176<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
177
178<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
179_8c.html" target="source" name="DistortImage">DistortImage</a></h2>
180<div class="doc-section">
181
182<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>
183
184<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>
185
186<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>
187
188<p>The format of the DistortImage() method is:</p>
189
190<pre class="code">
191 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]192 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]193 MagickBooleanType bestfit, ExceptionInfo *exception)
194</pre>
195
196<p>A description of each parameter follows:</p></ol>
197
198<h5>image</h5>
199<ol><p>the image to be distorted.</p></ol>
200
201<h5>method</h5>
202<ol><p>the method of image distortion.</p></ol>
203
204<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>
205
206<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>
207
208<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>
209
210<h5>number_arguments</h5>
211<ol><p>the number of arguments given.</p></ol>
212
213<h5>arguments</h5>
214<ol><p>an array of floating point arguments for this method.</p></ol>
215
216<h5>bestfit</h5>
217<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>
218
219<h5>exception</h5>
220<ol><p>return any errors or warnings in this structure</p></ol>
221
222<p>Extra Controls from Image meta-data (artifacts)...</p></ol>
223
224<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>
225
226<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>
227
228<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>
229
230<p>Other settings that can effect results include</p></ol>
231
232<p>o 'interpolate' For source image lookups (scale enlargements)</p></ol>
233
234<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>
235
236 </div>
237<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
238_8c.html" target="source" name="SparseColorImage">SparseColorImage</a></h2>
239<div class="doc-section">
240
241<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p></ol>
242
243<p>The format of the SparseColorImage() method is:</p>
244
245<pre class="code">
246 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]247 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]248 const double *arguments,ExceptionInfo *exception)
249</pre>
250
251<p>A description of each parameter follows:</p></ol>
252
253<h5>image</h5>
254<ol><p>the image to be filled in.</p></ol>
255
256<h5>channel</h5>
257<ol><p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p></ol>
258
259<h5>method</h5>
260<ol><p>the method to fill in the gradient between the control points.</p></ol>
261
262<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>
263
264<h5>number_arguments</h5>
265<ol><p>the number of arguments given.</p></ol>
266
267<h5>arguments</h5>
268<ol><p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p></ol>
269
270<h5>exception</h5>
271<ol><p>return any errors or warnings in this structure</p></ol>
272
273 </div>
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