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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]181<h1>Module distort
182 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
184
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]185<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/distort
186_8c.html" id="DistortImage">DistortImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187<div class="doc-section">
188
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]189<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]190
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]191<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]192
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]193<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]194
195<p>The format of the DistortImage() method is:</p>
196
197<pre class="code">
198 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]199 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]200 MagickBooleanType bestfit, ExceptionInfo *exception)
201</pre>
202
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]203<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]204
205<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]206<p>the image to be distorted.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]207
208<h5>method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]209<p>the method of image distortion.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]211<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]212
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]213<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]214
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]215<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216
217<h5>number_arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]218<p>the number of arguments given.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]219
220<h5>arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]221<p>an array of floating point arguments for this method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222
223<h5>bestfit</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]224<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225
226<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]227<p>return any errors or warnings in this structure</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]229<p>Extra Controls from Image meta-data (artifacts)...</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]230
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]231<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]232
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]233<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]234
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]235<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]237<p>Other settings that can effect results include</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]239<p>o 'interpolate' For source image lookups (scale enlargements)</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]240
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]241<p>o 'filter' Set filter to use for area-resampling (scale shrinking). Set to 'point' to turn off and use 'interpolate' lookup instead</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242
243 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]244<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/distort
245_8c.html" id="SparseColorImage">SparseColorImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]246<div class="doc-section">
247
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]248<p>SparseColorImage(), given a set of coordinates, interpolates the colors found at those coordinates, across the whole image, using various methods.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]249
250<p>The format of the SparseColorImage() method is:</p>
251
252<pre class="code">
253 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]254 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]255 const double *arguments,ExceptionInfo *exception)
256</pre>
257
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]258<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]259
260<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]261<p>the image to be filled in.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]262
263<h5>channel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]264<p>Specify which color values (in RGBKA sequence) are being set. This also determines the number of color_values in above.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]265
266<h5>method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]267<p>the method to fill in the gradient between the control points.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]268
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]270
271<h5>number_arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]272<p>the number of arguments given.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]273
274<h5>arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]275<p>array of floating point arguments for this method-- x,y,color_values-- with color_values given as normalized values.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]276
277<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]278<p>return any errors or warnings in this structure</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279
280 </div>
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