magick wrote:From http://magick.imagemagick.org/script/ar ... hp#threads:
Many of ImageMagick's internal algorithms are threaded to take advantage of speed-ups offered by the dual and quad-core processor technologies. However, you are welcome to use ImageMagick algorithm in your threads of execution with the exception of the MagickCore AcquireImagePixels(), GetImagePixels(), SetImagePixels(), and SyncImagePixels() pixel cache methods. These methods are intended for one thread of execution only. To access the pixel cache with more than one thread of execution, use a cache view. We do this for the CompositeImage() method, for example. Suppose we want to composite a single image over a different image in each thread of execution. If we use AcquireImagePixels(), the results could be corrupt since multiple threads might be asking for different areas of the pixel cache simultaneously. Instead we use AcquireCacheViewPixels() which creates a unique view for each thread of execution ensuring our program behaves properly regardless of how many threads are invoked. The other program interfaces, such as the MagickWand API, are completely thread safe so there are no special precautions for threads of execution.
magick wrote:If you add --enable-openmp to your configure script command line and build ImageMagick, convolution operations run in multiple threads (e.g. blur, sharpen, unsharp mask, edge, etc). We intend to thread additional image processing algorithms in the future as time permits.
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