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Acorn 4 flies through image editing with new filter UI, improved speed, and curves - The Verge
http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNFQ0FH_1WNp0x2SNv2-Sf1mKYVXlw&url=http://www.theverge.com/2013/5/2/4292166/acorn-4-mac-image-editor-launched-speed-new-ui-curves