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197<div class="main">
198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<h1>Module layer Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]200<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]201
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]202<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="CoalesceImages">CoalesceImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]203<div class="doc-section">
204
205<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>
206
207<p>The format of the CoalesceImages method is:</p>
208
209<pre class="code">
210 Image *CoalesceImages(Image *image,ExceptionInfo *exception)
211</pre>
212
213<p>A description of each parameter follows:</p>
214
215<h5>image</h5>
216<p>the image sequence.</p>
217
218<h5>exception</h5>
219<p>return any errors or warnings in this structure.</p>
220
221 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]222<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="DisposeImages">DisposeImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]223<div class="doc-section">
224
225<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>
226
227<p>The format of the DisposeImages method is:</p>
228
229<pre class="code">
230 Image *DisposeImages(Image *image,ExceptionInfo *exception)
231</pre>
232
233<p>A description of each parameter follows:</p>
234
235<h5>image</h5>
236<p>the image sequence.</p>
237
238<h5>exception</h5>
239<p>return any errors or warnings in this structure.</p>
240
241 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]242<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="CompareImageLayers">CompareImageLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]243<div class="doc-section">
244
245<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>
246
247<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>
248
249<p>No GIF dispose methods are applied, so GIF animations must be coalesced before applying this image operator to find differences to them.</p>
250
251<p>The format of the CompareImageLayers method is:</p>
252
253<pre class="code">
254 Image *CompareImageLayers(const Image *images,
255 const ImageLayerMethod method,ExceptionInfo *exception)
256</pre>
257
258<p>A description of each parameter follows:</p>
259
260<h5>image</h5>
261<p>the image.</p>
262
263<h5>method</h5>
264<p>the layers type to compare images with. Must be one of... CompareAnyLayer, CompareClearLayer, CompareOverlayLayer.</p>
265
266<h5>exception</h5>
267<p>return any errors or warnings in this structure.</p>
268
269 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]270<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="DeconstructImages">DeconstructImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]271<div class="doc-section">
272
273<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>
274
275<p>This function is deprecated in favor of the more universal CompareImageLayers() function.</p>
276
277<p>The format of the DeconstructImages method is:</p>
278
279<pre class="code">
280 Image *DeconstructImages(const Image *images, ExceptionInfo *exception)
281</pre>
282
283<p>A description of each parameter follows:</p>
284
285<h5>image</h5>
286<p>the image.</p>
287
288<h5>exception</h5>
289<p>return any errors or warnings in this structure.</p>
290
291 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]292<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="OptimizeImageLayers">OptimizeImageLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]293<div class="doc-section">
294
295<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>
296
297<p>The format of the OptimizeImageLayers method is:</p>
298
299<pre class="code">
300 Image *OptimizeImageLayers(const Image *image,
301 ExceptionInfo *exception)
302</pre>
303
304<p>A description of each parameter follows:</p>
305
306<h5>image</h5>
307<p>the image.</p>
308
309<h5>exception</h5>
310<p>return any errors or warnings in this structure.</p>
311
312 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]313<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="OptimizeImagePlusLayers">OptimizeImagePlusLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]314<div class="doc-section">
315
316<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>
317
318<p>The format of the OptimizePlusImageLayers method is:</p>
319
320<pre class="code">
321 Image *OptimizePlusImageLayers(const Image *image,
322 ExceptionInfo *exception)
323</pre>
324
325<p>A description of each parameter follows:</p>
326
327<h5>image</h5>
328<p>the image.</p>
329
330<h5>exception</h5>
331<p>return any errors or warnings in this structure.</p>
332
333 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]334<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="OptimizeImageTransparency">OptimizeImageTransparency</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]335<div class="doc-section">
336
337<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>
338
339<p>WARNING: This modifies the current images directly, rather than generate a new image sequence.</p>
340
341<p>The format of the OptimizeImageTransperency method is:</p>
342
343<pre class="code">
344 void OptimizeImageTransperency(Image *image,ExceptionInfo *exception)
345</pre>
346
347<p>A description of each parameter follows:</p>
348
349<h5>image</h5>
350<p>the image sequence</p>
351
352<h5>exception</h5>
353<p>return any errors or warnings in this structure.</p>
354
355 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]356<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="RemoveDuplicateLayers">RemoveDuplicateLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]357<div class="doc-section">
358
359<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>
360
361<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>
362
363<p>The format of the RemoveDuplicateLayers method is:</p>
364
365<pre class="code">
366 void RemoveDuplicateLayers(Image **image, ExceptionInfo *exception)
367</pre>
368
369<p>A description of each parameter follows:</p>
370
371<h5>images</h5>
372<p>the image list</p>
373
374<h5>exception</h5>
375<p>return any errors or warnings in this structure.</p>
376
377 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]378<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="RemoveZeroDelayLayers">RemoveZeroDelayLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]379<div class="doc-section">
380
381<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>
382
383<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>
384
385<p>No warning will be given if no image was removed because all images had an appropriate non-zero time delay set.</p>
386
387<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>
388
389<p>The format of the RemoveZeroDelayLayers method is:</p>
390
391<pre class="code">
392 void RemoveZeroDelayLayers(Image **image, ExceptionInfo *exception)
393</pre>
394
395<p>A description of each parameter follows:</p>
396
397<h5>images</h5>
398<p>the image list</p>
399
400<h5>exception</h5>
401<p>return any errors or warnings in this structure.</p>
402
403 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]404<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="CompositeLayers">CompositeLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]405<div class="doc-section">
406
407<p>CompositeLayers() compose first image sequence (source) over the second image sequence (destination), using the given compose method and offsets.</p>
408
409<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>
410
411<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>
412
413<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>
414
415<p>The destination list will be expanded as needed to match number of source image overlaid (from current position to end of list).</p>
416
417<p>The format of the CompositeLayers method is:</p>
418
419<pre class="code">
420 void CompositeLayers(Image *destination,
421 const CompositeOperator compose, Image *source,
422 const ssize_t x_offset, const ssize_t y_offset,
423 ExceptionInfo *exception);
424</pre>
425
426<p>A description of each parameter follows:</p>
427
428<h5>destination</h5>
429<p>the destination images and results</p>
430
431<h5>source</h5>
432<p>source image(s) for the layer composition</p>
433
434<h5>compose, x_offset, y_offset</h5>
435<p>arguments passed on to CompositeImages()</p>
436
437<h5>exception</h5>
438<p>return any errors or warnings in this structure.</p>
439
440 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]441<h2><a href="http://www.imagemagick.org/api/MagickCore/layer_8c.html" id="MergeImageLayers">MergeImageLayers</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]442<div class="doc-section">
443
444<p>MergeImageLayers() composes all the image layers from the current given image onward to produce a single image of the merged layers.</p>
445
446<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>
447
448<p>The format of the MergeImageLayers is:</p>
449
450<pre class="text">
451 Image *MergeImageLayers(const Image *image,
452 const ImageLayerMethod method, ExceptionInfo *exception)
453</pre>
454
455<p>A description of each parameter follows:</p>
456
457<h5>image</h5>
458<p>the image list to be composited together</p>
459
460<h5>method</h5>
461<p>the method of selecting the size of the initial canvas.</p>
462
463<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>
464
465<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>
466
467<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>
468
469<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>
470
471<p>WARNING: a new image is not returned, the original image sequence page data is modified instead.</p>
472
473<h5>exception</h5>
474<p>return any errors or warnings in this structure.</p>
475
476 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]477
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