Performance

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Processing a raw image in Ansel requires a great deal of system memory. A simple calculation makes this clear: For a 20 megapixel image, Ansel requires a 4x32-bit floating point cell to store each pixel, meaning that each full image of this size will require approximately 300MB of memory just to store the image data. In order to actually process this image through a given module, Ansel needs at least two buffers (input and output) of this size, with more complex modules potentially requiring several additional buffers for intermediate data. Without further optimization, anything between 600MB and 3GB of memory might be required to store and process image data as the pixelpipe executes. On top of this is Ansel’s code segment, the code and data of any dynamically-linked system libraries, as well as further buffers that Ansel uses to store intermediate states (cache) for quick access during interactive work.