{"action":"created","issue":{"url":"https://api.github.com/repos/mozilla/mozjpeg/issues/184","labels_url":"https://api.github.com/repos/mozilla/mozjpeg/issues/184/labels{/name}","comments_url":"https://api.github.com/repos/mozilla/mozjpeg/issues/184/comments","events_url":"https://api.github.com/repos/mozilla/mozjpeg/issues/184/events","html_url":"https://github.com/mozilla/mozjpeg/issues/184","id":97644290,"number":184,"title":"Jpeg custom Huffman tables","user":{"login":"jrmsmith","id":13423335,"avatar_url":"https://avatars.githubusercontent.com/u/13423335?v=3","gravatar_id":"","url":"https://api.github.com/users/jrmsmith","html_url":"https://github.com/jrmsmith","followers_url":"https://api.github.com/users/jrmsmith/followers","following_url":"https://api.github.com/users/jrmsmith/following{/other_user}","gists_url":"https://api.github.com/users/jrmsmith/gists{/gist_id}","starred_url":"https://api.github.com/users/jrmsmith/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jrmsmith/subscriptions","organizations_url":"https://api.github.com/users/jrmsmith/orgs","repos_url":"https://api.github.com/users/jrmsmith/repos","events_url":"https://api.github.com/users/jrmsmith/events{/privacy}","received_events_url":"https://api.github.com/users/jrmsmith/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":4,"created_at":"2015-07-28T08:24:07Z","updated_at":"2015-07-28T12:23:47Z","closed_at":null,"body":"According to the following paper jpeg allows custom Huffman tables: [Improved Huffman coding using recursive splitting](http://www.researchgate.net/profile/Karl_Skretting/publication/229000715_Improved_Huffman_coding_using_recursive_splitting/links/02e7e535e4866ce1c7000000.pdf). How custom? I don't know.\r\n\r\nThe algorithm mentioned on this paper yields gains ranging 0-15% above jpeg's implementation. \r\n"},"comment":{"url":"https://api.github.com/repos/mozilla/mozjpeg/issues/comments/125581975","html_url":"https://github.com/mozilla/mozjpeg/issues/184#issuecomment-125581975","issue_url":"https://api.github.com/repos/mozilla/mozjpeg/issues/184","id":125581975,"user":{"login":"jrmsmith","id":13423335,"avatar_url":"https://avatars.githubusercontent.com/u/13423335?v=3","gravatar_id":"","url":"https://api.github.com/users/jrmsmith","html_url":"https://github.com/jrmsmith","followers_url":"https://api.github.com/users/jrmsmith/followers","following_url":"https://api.github.com/users/jrmsmith/following{/other_user}","gists_url":"https://api.github.com/users/jrmsmith/gists{/gist_id}","starred_url":"https://api.github.com/users/jrmsmith/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jrmsmith/subscriptions","organizations_url":"https://api.github.com/users/jrmsmith/orgs","repos_url":"https://api.github.com/users/jrmsmith/repos","events_url":"https://api.github.com/users/jrmsmith/events{/privacy}","received_events_url":"https://api.github.com/users/jrmsmith/received_events","type":"User","site_admin":false},"created_at":"2015-07-28T12:23:47Z","updated_at":"2015-07-28T12:23:47Z","body":"OK. So we now know that the degrees of freedom you were trying to use in [Avoid 0xFF00 markers in Huffman data](https://github.com/mozilla/mozjpeg/issues/27) do not exist, because that changes the coding scheme."}}