Acorn is a raster graphic editor for macOS developed by August Mueller of Flying Meat Inc, based out of Mukilteo, Washington, United States. Acorn was first released on September 10, 2007[2] and was built upon the framework of a previous image editing application of Flying Meat Inc., FlySketch.[3]
Acorn makes extensive use of Apple's Core Image framework for its image processing.[4][5] The native file format of Acorn is .acorn. Acorn combines vector drawing with bitmap editing,[6] and has been described as an alternative to Photoshop.[7] Key features of Acorn include image filters, a custom color picker, a brush designer, and image editing tools such as crop, erase, paint, select, pan, zoom, move, clone, smudge, dodge, and burn.[8]
Layer styles,[17] quick mask, instant alpha,[9] live multi-stop gradients, new filters, add/subtract points on Bézier curves, full screen support, autosave and versions, retina canvas support,[18] smart layer export, web export scaling, new blending modes [19]
Nondestructive stackable filters,[7] curves adjustment,[11] vector line join style, multi-layer selection,[10] save selection with file, CMYK support when saving as JPEG and TIFF, editable image depth, sharing support, soft eraser, live font updates, live blending updates, share extension for Photos
Shape processor, nondestructive curves and levels, improved PDF import, Photoshop brush import, image metadata editing, basic SVG support, deep color image support, circle text tool, new color picker, improved color management[20]
Text on a path, clone tool works across layers and images, new Web Export features, smart layer export settings palette, new Bézier tools, color profiles, make shape from selection [21]
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