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GIMP 2.8 RC 1 includes OpenCL acceleration

The OpenCL hardware acceleration features in the Generic Graphics Library (GEGL) were originally developed as part of Google's Summer of Code in 2009 and 2011 and finished over the winter with sponsorship from AMD and help by MulticoreWare. On supported systems, this feature should greatly speed up processor intensive operations. Users have to start the application with the command line parameter GEGL_USE_OPENCL=yes to use OpenCL.
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Tom’s Hardware tests OpenCL acceleration across photo editing apps

Tom's Hardware tests OpenCL acceleration in Adobe PhotoShop CS6, Musemage, GIMP and a pre-release version of Corel's AfterShot Pro, across five system configurations and looks for patterns in the results including scaling based on GPU horsepower.
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StreamComputing launches GEGL-OpenCL project

Khronos member StreamComputing launched an educational initiative that aims to get more developers to study and use OpenCL in their projects. Within this project, up to 20 collaborators will port as many GEGL operations to OpenCL as possible. Vincent Hindriksen and Adel Johar who organized this project looked for a way for the group to educate themselves. One of the ways was to gamify the porting by benchmarking the kernels and defining winners, and another was to optimize kernels within StreamComputing to push the limits. Victor Oliveira, who wrote most of the OpenCL code in GEGL, joined the GEGL-OpenCL project to advise.
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