Hardware acceleration uses your computer’s GPU devices to dramatically increase rendering performance for raster-based operations, such as compositing pixel layers, adjustment layers, live filters and raster tools. There’s also a dedicated background removal filter for removing difficult background gradients (light pollution, airglow, moon illumination, sensor defects) after tone stretching. Developer Serif claims that this makes Affinity Photo one of the very few cross-platform apps that can perform the entire astrophotography post-production workflow, from stacking to powerful editing and retouching-all in 32-bit precision.For stacking, you can auto-detect hot/cold pixels and manually highlight column defects to produce a cleaner stacked result. You are now able to stack deep sky astrophotography imagery, including FITs documents in addition to RAW files. Affinity Photo 1.9 has a new mode to control the stacking of astrophotography images.
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