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206<div class="main">
207
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]208<h1>Module distort Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]209<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]210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<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]212<div class="doc-section">
213
214<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>
215
216<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>
217
218<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>
219
220<p>The format of the DistortImage() method is:</p>
221
222<pre class="code">
223 Image *DistortImage(const Image *image,const DistortImageMethod method,
224 const size_t number_arguments,const double *arguments,
225 MagickBooleanType bestfit, ExceptionInfo *exception)
226</pre>
227
228<p>A description of each parameter follows:</p>
229
230<h5>image</h5>
231<p>the image to be distorted.</p>
232
233<h5>method</h5>
234<p>the method of image distortion.</p>
235
236<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>
237
238<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>
239
240<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>
241
242<h5>number_arguments</h5>
243<p>the number of arguments given.</p>
244
245<h5>arguments</h5>
246<p>an array of floating point arguments for this method.</p>
247
248<h5>bestfit</h5>
249<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>
250
251<h5>exception</h5>
252<p>return any errors or warnings in this structure</p>
253
254<p>Extra Controls from Image meta-data (artifacts)...</p>
255
cristybaacd172011-04-30 23:11:03 +0000[diff] [blame]256<p>o "verbose" Output to stderr alternatives, internal coefficents, and FX equivalents 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>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]257
258<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>
259
260<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>
261
262<p>Other settings that can effect results include</p>
263
264<p>o 'interpolate' For source image lookups (scale enlargements)</p>
265
266<p>o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead</p>
267
268 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]269<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]270<div class="doc-section">
271
272<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p>
273
274<p>The format of the SparseColorImage() method is:</p>
275
276<pre class="code">
277 Image *SparseColorImage(const Image *image,const ChannelType channel,
278 const SparseColorMethod method,const size_t number_arguments,
279 const double *arguments,ExceptionInfo *exception)
280</pre>
281
282<p>A description of each parameter follows:</p>
283
284<h5>image</h5>
285<p>the image to be filled in.</p>
286
287<h5>channel</h5>
288<p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p>
289
290<h5>method</h5>
291<p>the method to fill in the gradient between the control points.</p>
292
293<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>
294
295<h5>number_arguments</h5>
296<p>the number of arguments given.</p>
297
298<h5>arguments</h5>
299<p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p>
300
301<h5>exception</h5>
302<p>return any errors or warnings in this structure</p>
303
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