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175<div class="main">
176
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]177<h1>Module distort
178 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
180
181<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
182_8c.html" target="source" name="DistortImage">DistortImage</a></h2>
183<div class="doc-section">
184
185<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>
186
187<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>
188
189<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>
190
191<p>The format of the DistortImage() method is:</p>
192
193<pre class="code">
194 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]195 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196 MagickBooleanType bestfit, ExceptionInfo *exception)
197</pre>
198
199<p>A description of each parameter follows:</p></ol>
200
201<h5>image</h5>
202<ol><p>the image to be distorted.</p></ol>
203
204<h5>method</h5>
205<ol><p>the method of image distortion.</p></ol>
206
207<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>
208
209<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>
210
211<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>
212
213<h5>number_arguments</h5>
214<ol><p>the number of arguments given.</p></ol>
215
216<h5>arguments</h5>
217<ol><p>an array of floating point arguments for this method.</p></ol>
218
219<h5>bestfit</h5>
220<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>
221
222<h5>exception</h5>
223<ol><p>return any errors or warnings in this structure</p></ol>
224
225<p>Extra Controls from Image meta-data (artifacts)...</p></ol>
226
227<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>
228
229<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>
230
231<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>
232
233<p>Other settings that can effect results include</p></ol>
234
235<p>o 'interpolate' For source image lookups (scale enlargements)</p></ol>
236
237<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>
238
239 </div>
240<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
241_8c.html" target="source" name="SparseColorImage">SparseColorImage</a></h2>
242<div class="doc-section">
243
244<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p></ol>
245
246<p>The format of the SparseColorImage() method is:</p>
247
248<pre class="code">
249 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]250 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]251 const double *arguments,ExceptionInfo *exception)
252</pre>
253
254<p>A description of each parameter follows:</p></ol>
255
256<h5>image</h5>
257<ol><p>the image to be filled in.</p></ol>
258
259<h5>channel</h5>
260<ol><p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p></ol>
261
262<h5>method</h5>
263<ol><p>the method to fill in the gradient between the control points.</p></ol>
264
265<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>
266
267<h5>number_arguments</h5>
268<ol><p>the number of arguments given.</p></ol>
269
270<h5>arguments</h5>
271<ol><p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p></ol>
272
273<h5>exception</h5>
274<ol><p>return any errors or warnings in this structure</p></ol>
275
276 </div>
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