{"action":"opened","issue":{"url":"https://api.github.com/repos/ComputationalRadiationPhysics/picongpu/issues/693","labels_url":"https://api.github.com/repos/ComputationalRadiationPhysics/picongpu/issues/693/labels{/name}","comments_url":"https://api.github.com/repos/ComputationalRadiationPhysics/picongpu/issues/693/comments","events_url":"https://api.github.com/repos/ComputationalRadiationPhysics/picongpu/issues/693/events","html_url":"https://github.com/ComputationalRadiationPhysics/picongpu/issues/693","id":57328207,"number":693,"title":"Creation of very bug PNG Images is slow","user":{"login":"ax3l","id":1353258,"avatar_url":"https://avatars.githubusercontent.com/u/1353258?v=3","gravatar_id":"","url":"https://api.github.com/users/ax3l","html_url":"https://github.com/ax3l","followers_url":"https://api.github.com/users/ax3l/followers","following_url":"https://api.github.com/users/ax3l/following{/other_user}","gists_url":"https://api.github.com/users/ax3l/gists{/gist_id}","starred_url":"https://api.github.com/users/ax3l/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ax3l/subscriptions","organizations_url":"https://api.github.com/users/ax3l/orgs","repos_url":"https://api.github.com/users/ax3l/repos","events_url":"https://api.github.com/users/ax3l/events{/privacy}","received_events_url":"https://api.github.com/users/ax3l/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/ComputationalRadiationPhysics/picongpu/labels/plugin","name":"plugin","color":"cf6800"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-02-11T15:12:55Z","updated_at":"2015-02-11T15:12:55Z","closed_at":null,"body":"As reported by @psychocoderHPC , the creation of very big PNGs (~4K and above) is very slow.\r\n\r\n- [ ] **needs verification:**\r\nA simple work-around for that, since PNGs are only a preview anyway, is to set [scale_image](https://github.com/ComputationalRadiationPhysics/picongpu/blob/a7e0fcda6c7b68b6e275086574c0df7ea5fd38c4/src/picongpu/include/simulation_defines/param/visualization.param#L31) in `visualization.param` to a smaller number to scale down the image that needs to be written.\r\n\r\nRight now we are investigating if the problem is caused by [libpng](http://www.libpng.org/pub/png/libpng.html) itself or by [pngwriter](https://github.com/pngwriter/pngwriter)."}}