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162
163<div class="main">
164
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]165<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
166
167<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
168_8c.html" target="source" name="DistortImage">DistortImage</a></h2>
169<div class="doc-section">
170
171<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>
172
173<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>
174
175<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>
176
177<p>The format of the DistortImage() method is:</p>
178
179<pre class="code">
180 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]181 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]182 MagickBooleanType bestfit, ExceptionInfo *exception)
183</pre>
184
185<p>A description of each parameter follows:</p></ol>
186
187<h5>image</h5>
188<ol><p>the image to be distorted.</p></ol>
189
190<h5>method</h5>
191<ol><p>the method of image distortion.</p></ol>
192
193<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>
194
195<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>
196
197<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>
198
199<h5>number_arguments</h5>
200<ol><p>the number of arguments given.</p></ol>
201
202<h5>arguments</h5>
203<ol><p>an array of floating point arguments for this method.</p></ol>
204
205<h5>bestfit</h5>
206<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>
207
208<h5>exception</h5>
209<ol><p>return any errors or warnings in this structure</p></ol>
210
211<p>Extra Controls from Image meta-data (artifacts)...</p></ol>
212
213<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>
214
215<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>
216
217<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>
218
219<p>Other settings that can effect results include</p></ol>
220
221<p>o 'interpolate' For source image lookups (scale enlargements)</p></ol>
222
223<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>
224
225 </div>
226<h2><a href="http://www.imagemagick.org/api/MagickCore/distort
227_8c.html" target="source" name="SparseColorImage">SparseColorImage</a></h2>
228<div class="doc-section">
229
230<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p></ol>
231
232<p>The format of the SparseColorImage() method is:</p>
233
234<pre class="code">
235 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]236 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]237 const double *arguments,ExceptionInfo *exception)
238</pre>
239
240<p>A description of each parameter follows:</p></ol>
241
242<h5>image</h5>
243<ol><p>the image to be filled in.</p></ol>
244
245<h5>channel</h5>
246<ol><p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p></ol>
247
248<h5>method</h5>
249<ol><p>the method to fill in the gradient between the control points.</p></ol>
250
251<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>
252
253<h5>number_arguments</h5>
254<ol><p>the number of arguments given.</p></ol>
255
256<h5>arguments</h5>
257<ol><p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p></ol>
258
259<h5>exception</h5>
260<ol><p>return any errors or warnings in this structure</p></ol>
261
262 </div>
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