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192
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]193<h1>Module distort Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]194<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]195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]196<h2><a href="http://www.imagemagick.org/api/MagickCore/distort_8c.html" id="DistortImage">DistortImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<div class="doc-section">
198
199<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>
200
201<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>
202
203<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>
204
205<p>The format of the DistortImage() method is:</p>
206
207<pre class="code">
208 Image *DistortImage(const Image *image,const DistortImageMethod method,
209 const size_t number_arguments,const double *arguments,
210 MagickBooleanType bestfit, ExceptionInfo *exception)
211</pre>
212
213<p>A description of each parameter follows:</p>
214
215<h5>image</h5>
216<p>the image to be distorted.</p>
217
218<h5>method</h5>
219<p>the method of image distortion.</p>
220
221<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>
222
223<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>
224
225<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>
226
227<h5>number_arguments</h5>
228<p>the number of arguments given.</p>
229
230<h5>arguments</h5>
231<p>an array of floating point arguments for this method.</p>
232
233<h5>bestfit</h5>
234<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>
235
236<h5>exception</h5>
237<p>return any errors or warnings in this structure</p>
238
239<p>Extra Controls from Image meta-data (artifacts)...</p>
240
241<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>
242
243<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>
244
245<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>
246
247<p>Other settings that can effect results include</p>
248
249<p>o 'interpolate' For source image lookups (scale enlargements)</p>
250
251<p>o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead</p>
252
253 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]254<h2><a href="http://www.imagemagick.org/api/MagickCore/distort_8c.html" id="SparseColorImage">SparseColorImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]255<div class="doc-section">
256
257<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p>
258
259<p>The format of the SparseColorImage() method is:</p>
260
261<pre class="code">
262 Image *SparseColorImage(const Image *image,const ChannelType channel,
263 const SparseColorMethod method,const size_t number_arguments,
264 const double *arguments,ExceptionInfo *exception)
265</pre>
266
267<p>A description of each parameter follows:</p>
268
269<h5>image</h5>
270<p>the image to be filled in.</p>
271
272<h5>channel</h5>
273<p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p>
274
275<h5>method</h5>
276<p>the method to fill in the gradient between the control points.</p>
277
278<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>
279
280<h5>number_arguments</h5>
281<p>the number of arguments given.</p>
282
283<h5>arguments</h5>
284<p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p>
285
286<h5>exception</h5>
287<p>return any errors or warnings in this structure</p>
288
289 </div>
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313 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]317</body>
318</html>