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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]189<h1>Module distort
190 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]191<p class="navigation-index">[<a href="#DistortImage">DistortImage</a> &bull; <a href="#SparseColorImage">SparseColorImage</a>]</p>
192
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]193<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/distort
194_8c.html" id="DistortImage">DistortImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]195<div class="doc-section">
196
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]197<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]198
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]199<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]200
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]201<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]202
203<p>The format of the DistortImage() method is:</p>
204
205<pre class="code">
206 Image *DistortImage(const Image *image,const DistortImageMethod method,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]207 const size_t number_arguments,const double *arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208 MagickBooleanType bestfit, ExceptionInfo *exception)
209</pre>
210
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]211<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]212
213<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]214<p>the image to be distorted.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]215
216<h5>method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]217<p>the method of image distortion.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]219<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]220
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]221<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]222
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]223<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]224
225<h5>number_arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]226<p>the number of arguments given.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]227
228<h5>arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]229<p>an array of floating point arguments for this method.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]230
231<h5>bestfit</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]232<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]233
234<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]235<p>return any errors or warnings in this structure</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]237<p>Extra Controls from Image meta-data (artifacts)...</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]239<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]240
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]241<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]242
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]243<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]244
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]245<p>Other settings that can effect results include</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]246
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]247<p>o 'interpolate' For source image lookups (scale enlargements)</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]248
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]249<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]250
251 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]252<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/distort
253_8c.html" id="SparseColorImage">SparseColorImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254<div class="doc-section">
255
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]256<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]257
258<p>The format of the SparseColorImage() method is:</p>
259
260<pre class="code">
261 Image *SparseColorImage(const Image *image,const ChannelType channel,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]262 const SparseColorMethod method,const size_t number_arguments,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]263 const double *arguments,ExceptionInfo *exception)
264</pre>
265
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]266<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]267
268<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<p>the image to be filled in.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]270
271<h5>channel</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]272<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]273
274<h5>method</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]275<p>the method to fill in the gradient between the control points.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]276
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]277<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]278
279<h5>number_arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]280<p>the number of arguments given.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]281
282<h5>arguments</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]283<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]284
285<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]286<p>return any errors or warnings in this structure</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]287
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