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150
151</div>
152
153<div class="main">
154
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]155<p class="navigation-index">[<a href="#CoalesceImages">CoalesceImages</a> &bull; <a href="#DisposeImages">DisposeImages</a> &bull; <a href="#CompareImageLayers">CompareImageLayers</a> &bull; <a href="#DeconstructImages">DeconstructImages</a> &bull; <a href="#OptimizeImageLayers">OptimizeImageLayers</a> &bull; <a href="#OptimizeImagePlusLayers">OptimizeImagePlusLayers</a> &bull; <a href="#OptimizeImageTransparency">OptimizeImageTransparency</a> &bull; <a href="#RemoveDuplicateLayers">RemoveDuplicateLayers</a> &bull; <a href="#RemoveZeroDelayLayers">RemoveZeroDelayLayers</a> &bull; <a href="#CompositeLayers">CompositeLayers</a> &bull; <a href="#MergeImageLayers">MergeImageLayers</a>]</p>
156
157<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
158_8c.html" target="source" name="CoalesceImages">CoalesceImages</a></h2>
159<div class="doc-section">
160
161<p>CoalesceImages() composites a set of images while respecting any page offsets and disposal methods. GIF, MIFF, and MNG animation sequences typically start with an image background and each subsequent image varies in size and offset. A new image sequence is returned with all images the same size as the first images virtual canvas and composited with the next image in the sequence.</p></ol>
162
163<p>The format of the CoalesceImages method is:</p>
164
165<pre class="code">
166 Image *CoalesceImages(Image *image,ExceptionInfo *exception)
167</pre>
168
169<p>A description of each parameter follows:</p></ol>
170
171<h5>image</h5>
172<ol><p>the image sequence.</p></ol>
173
174<h5>exception</h5>
175<ol><p>return any errors or warnings in this structure.</p></ol>
176
177 </div>
178<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
179_8c.html" target="source" name="DisposeImages">DisposeImages</a></h2>
180<div class="doc-section">
181
182<p>DisposeImages() returns the coalesced frames of a GIF animation as it would appear after the GIF dispose method of that frame has been applied. That is it returned the appearance of each frame before the next is overlaid.</p></ol>
183
184<p>The format of the DisposeImages method is:</p>
185
186<pre class="code">
187 Image *DisposeImages(Image *image,ExceptionInfo *exception)
188</pre>
189
190<p>A description of each parameter follows:</p></ol>
191
192<h5>image</h5>
193<ol><p>the image sequence.</p></ol>
194
195<h5>exception</h5>
196<ol><p>return any errors or warnings in this structure.</p></ol>
197
198 </div>
199<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
200_8c.html" target="source" name="CompareImageLayers">CompareImageLayers</a></h2>
201<div class="doc-section">
202
203<p>CompareImageLayers() compares each image with the next in a sequence and returns the minimum bounding region of all the pixel differences (of the ImageLayerMethod specified) it discovers.</p></ol>
204
205<p>Images do NOT have to be the same size, though it is best that all the images are 'coalesced' (images are all the same size, on a flattened canvas, so as to represent exactly how an specific frame should look).</p></ol>
206
207<p>No GIF dispose methods are applied, so GIF animations must be coalesced before applying this image operator to find differences to them.</p></ol>
208
209<p>The format of the CompareImageLayers method is:</p>
210
211<pre class="code">
212 Image *CompareImageLayers(const Image *images,
213 const ImageLayerMethod method,ExceptionInfo *exception)
214</pre>
215
216<p>A description of each parameter follows:</p></ol>
217
218<h5>image</h5>
219<ol><p>the image.</p></ol>
220
221<h5>method</h5>
222<ol><p>the layers type to compare images with. Must be one of... CompareAnyLayer, CompareClearLayer, CompareOverlayLayer.</p></ol>
223
224<h5>exception</h5>
225<ol><p>return any errors or warnings in this structure.</p></ol>
226
227 </div>
228<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
229_8c.html" target="source" name="DeconstructImages">DeconstructImages</a></h2>
230<div class="doc-section">
231
232<p>DeconstructImages() compares each image with the next in a sequence and returns the minimum bounding region of all differences from the first image.</p></ol>
233
234<p>This function is deprecated in favor of the more universal CompareImageLayers() function.</p></ol>
235
236<p>The format of the DeconstructImages method is:</p>
237
238<pre class="code">
239 Image *DeconstructImages(const Image *images, ExceptionInfo *exception)
240</pre>
241
242<p>A description of each parameter follows:</p></ol>
243
244<h5>image</h5>
245<ol><p>the image.</p></ol>
246
247<h5>exception</h5>
248<ol><p>return any errors or warnings in this structure.</p></ol>
249
250 </div>
251<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
252_8c.html" target="source" name="OptimizeImageLayers">OptimizeImageLayers</a></h2>
253<div class="doc-section">
254
255<p>OptimizeImageLayers() compares each image the GIF disposed forms of the previous image in the sequence. From this it attempts to select the smallest cropped image to replace each frame, while preserving the results of the GIF animation.</p></ol>
256
257<p>The format of the OptimizeImageLayers method is:</p>
258
259<pre class="code">
260 Image *OptimizeImageLayers(const Image *image,
261 ExceptionInfo *exception)
262</pre>
263
264<p>A description of each parameter follows:</p></ol>
265
266<h5>image</h5>
267<ol><p>the image.</p></ol>
268
269<h5>exception</h5>
270<ol><p>return any errors or warnings in this structure.</p></ol>
271
272 </div>
273<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
274_8c.html" target="source" name="OptimizeImagePlusLayers">OptimizeImagePlusLayers</a></h2>
275<div class="doc-section">
276
277<p>OptimizeImagePlusLayers() is exactly as OptimizeImageLayers(), but may also add or even remove extra frames in the animation, if it improves the total number of pixels in the resulting GIF animation.</p></ol>
278
279<p>The format of the OptimizePlusImageLayers method is:</p>
280
281<pre class="code">
282 Image *OptimizePlusImageLayers(const Image *image,
283 ExceptionInfo *exception)
284</pre>
285
286<p>A description of each parameter follows:</p></ol>
287
288<h5>image</h5>
289<ol><p>the image.</p></ol>
290
291<h5>exception</h5>
292<ol><p>return any errors or warnings in this structure.</p></ol>
293
294 </div>
295<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
296_8c.html" target="source" name="OptimizeImageTransparency">OptimizeImageTransparency</a></h2>
297<div class="doc-section">
298
299<p>OptimizeImageTransparency() takes a frame optimized GIF animation, and compares the overlayed pixels against the disposal image resulting from all the previous frames in the animation. Any pixel that does not change the disposal image (and thus does not effect the outcome of an overlay) is made transparent.</p></ol>
300
301<p>WARNING: This modifies the current images directly, rather than generate a new image sequence.</p></ol>
302
303<p>The format of the OptimizeImageTransperency method is:</p>
304
305<pre class="code">
306 void OptimizeImageTransperency(Image *image,ExceptionInfo *exception)
307</pre>
308
309<p>A description of each parameter follows:</p></ol>
310
311<h5>image</h5>
312<ol><p>the image sequence</p></ol>
313
314<h5>exception</h5>
315<ol><p>return any errors or warnings in this structure.</p></ol>
316
317 </div>
318<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
319_8c.html" target="source" name="RemoveDuplicateLayers">RemoveDuplicateLayers</a></h2>
320<div class="doc-section">
321
322<p>RemoveDuplicateLayers() removes any image that is exactly the same as the next image in the given image list. Image size and virtual canvas offset must also match, though not the virtual canvas size itself.</p></ol>
323
324<p>No check is made with regards to image disposal setting, though it is the dispose setting of later image that is kept. Also any time delays are also added together. As such coalesced image animations should still produce the same result, though with duplicte frames merged into a single frame.</p></ol>
325
326<p>The format of the RemoveDuplicateLayers method is:</p>
327
328<pre class="code">
329 void RemoveDuplicateLayers(Image **image, ExceptionInfo *exception)
330</pre>
331
332<p>A description of each parameter follows:</p></ol>
333
334<h5>images</h5>
335<ol><p>the image list</p></ol>
336
337<h5>exception</h5>
338<ol><p>return any errors or warnings in this structure.</p></ol>
339
340 </div>
341<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
342_8c.html" target="source" name="RemoveZeroDelayLayers">RemoveZeroDelayLayers</a></h2>
343<div class="doc-section">
344
345<p>RemoveZeroDelayLayers() removes any image that as a zero delay time. Such images generally represent intermediate or partial updates in GIF animations used for file optimization. They are not ment to be displayed to users of the animation. Viewable images in an animation should have a time delay of 3 or more centi-seconds (hundredths of a second).</p></ol>
346
347<p>However if all the frames have a zero time delay, then either the animation is as yet incomplete, or it is not a GIF animation. This a non-sensible situation, so no image will be removed and a 'Zero Time Animation' warning (exception) given.</p></ol>
348
349<p>No warning will be given if no image was removed because all images had an appropriate non-zero time delay set.</p></ol>
350
351<p>Due to the special requirements of GIF disposal handling, GIF animations should be coalesced first, before calling this function, though that is not a requirement.</p></ol>
352
353<p>The format of the RemoveZeroDelayLayers method is:</p>
354
355<pre class="code">
356 void RemoveZeroDelayLayers(Image **image, ExceptionInfo *exception)
357</pre>
358
359<p>A description of each parameter follows:</p></ol>
360
361<h5>images</h5>
362<ol><p>the image list</p></ol>
363
364<h5>exception</h5>
365<ol><p>return any errors or warnings in this structure.</p></ol>
366
367 </div>
368<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
369_8c.html" target="source" name="CompositeLayers">CompositeLayers</a></h2>
370<div class="doc-section">
371
372<p>CompositeLayers() compose first image sequence (source) over the second image sequence (destination), using the given compose method and offsets.</p></ol>
373
374<p>The pointers to the image list does not have to be the start of that image list, but may start somewhere in the middle. Each layer from the two image lists are composted together until the end of one of the image lists is reached. The offset of each composition is also adjusted to match the virtual canvas offsets of each layer. As such the given offset is relative to the virtual canvas, and not the actual image.</p></ol>
375
376<p>No GIF disposal handling is performed, so GIF animations should be coalesced before use. However this not a requirement, and individual layer images may have any size or offset, for special compositions.</p></ol>
377
378<p>Special case:- If one of the image sequences is just a single image that image is repeatally composed with all the images in the other image list. Either the source or destination lists may be the single image, for this situation.</p></ol>
379
380<p>The destination list will be expanded as needed to match number of source image overlaid (from current position to end of list).</p></ol>
381
382<p>The format of the CompositeLayers method is:</p>
383
384<pre class="code">
385 void CompositeLayers(Image *destination,
386 const CompositeOperator compose, Image *source,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]387 const ssize_t x_offset, const ssize_t y_offset,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]388 ExceptionInfo *exception);
389</pre>
390
391<p>A description of each parameter follows:</p></ol>
392
393<h5>destination</h5>
394<ol><p>the destination images and results</p></ol>
395
396<h5>source</h5>
397<ol><p>source image(s) for the layer composition</p></ol>
398
399<h5>compose, x_offset, y_offset</h5>
400<ol><p>arguments passed on to CompositeImages()</p></ol>
401
402<h5>exception</h5>
403<ol><p>return any errors or warnings in this structure.</p></ol>
404
405 </div>
406<h2><a href="http://www.imagemagick.org/api/MagickCore/layer
407_8c.html" target="source" name="MergeImageLayers">MergeImageLayers</a></h2>
408<div class="doc-section">
409
410<p>MergeImageLayers() composes all the image layers from the current given image onward to produce a single image of the merged layers.</p></ol>
411
412<p>The inital canvas's size depends on the given ImageLayerMethod, and is initialized using the first images background color. The images are then compositied onto that image in sequence using the given composition that has been assigned to each individual image.</p></ol>
413
414<p>The format of the MergeImageLayers is:</p>
415
416<pre class="text">
417 Image *MergeImageLayers(const Image *image,
418 const ImageLayerMethod method, ExceptionInfo *exception)
419</pre>
420
421<p>A description of each parameter follows:</p></ol>
422
423<h5>image</h5>
424<ol><p>the image list to be composited together</p></ol>
425
426<h5>method</h5>
427<ol><p>the method of selecting the size of the initial canvas.</p></ol>
428
429<p>MergeLayer: Merge all layers onto a canvas just large enough to hold all the actual images. The virtual canvas of the first image is preserved but otherwise ignored.</p></ol>
430
431<p>FlattenLayer: Use the virtual canvas size of first image. Images which fall outside this canvas is clipped. This can be used to 'fill out' a given virtual canvas.</p></ol>
432
433<p>MosaicLayer: Start with the virtual canvas of the first image, enlarging left and right edges to contain all images. Images with negative offsets will be clipped.</p></ol>
434
435<p>TrimBoundsLayer: Determine the overall bounds of all the image layers just as in "MergeLayer", then adjust the the canvas and offsets to be relative to those bounds, without overlaying the images.</p></ol>
436
437<p>WARNING: a new image is not returned, the original image sequence page data is modified instead.</p></ol>
438
439<h5>exception</h5>
440<ol><p>return any errors or warnings in this structure.</p></ol>
441
442 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]443
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