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192
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]193<h1>Module distort
194 Methods</h1>
195<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]197<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
198_8c.html" id="DistortImage">DistortImage</a></h2>
199<div class="doc-section">
200
201<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>
202
203<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>
204
205<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>
206
207<p>The format of the DistortImage() method is:</p>
208
209<pre class="code">
210 Image *DistortImage(const Image *image,const DistortImageMethod method,
211 const size_t number_arguments,const double *arguments,
212 MagickBooleanType bestfit, ExceptionInfo *exception)
213</pre>
214
215<p>A description of each parameter follows:</p>
216
217<h5>image</h5>
218<p>the image to be distorted.</p>
219
220<h5>method</h5>
221<p>the method of image distortion.</p>
222
223<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>
224
225<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>
226
227<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>
228
229<h5>number_arguments</h5>
230<p>the number of arguments given.</p>
231
232<h5>arguments</h5>
233<p>an array of floating point arguments for this method.</p>
234
235<h5>bestfit</h5>
236<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>
237
238<h5>exception</h5>
239<p>return any errors or warnings in this structure</p>
240
241<p>Extra Controls from Image meta-data (artifacts)...</p>
242
243<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>
244
245<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>
246
247<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>
248
249<p>Other settings that can effect results include</p>
250
251<p>o 'interpolate' For source image lookups (scale enlargements)</p>
252
253<p>o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead</p>
254
255 </div>
256<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
257_8c.html" id="SparseColorImage">SparseColorImage</a></h2>
258<div class="doc-section">
259
260<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p>
261
262<p>The format of the SparseColorImage() method is:</p>
263
264<pre class="code">
265 Image *SparseColorImage(const Image *image,const ChannelType channel,
266 const SparseColorMethod method,const size_t number_arguments,
267 const double *arguments,ExceptionInfo *exception)
268</pre>
269
270<p>A description of each parameter follows:</p>
271
272<h5>image</h5>
273<p>the image to be filled in.</p>
274
275<h5>channel</h5>
276<p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p>
277
278<h5>method</h5>
279<p>the method to fill in the gradient between the control points.</p>
280
281<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>
282
283<h5>number_arguments</h5>
284<p>the number of arguments given.</p>
285
286<h5>arguments</h5>
287<p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p>
288
289<h5>exception</h5>
290<p>return any errors or warnings in this structure</p>
291
292 </div>
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]320</body>
321</html>