> From: Raul Miller > Sent: Wednesday, 11 August 2010 03:01 > > So... I use gethttp to retrieve a png image which I want to manipulate > in J. > > png=:gethttp'http://rosettacode.org/mw/images/c/c6/Pentagon.png' > > What is the simplest way to convert that raw data to an array of pixel > values?
I think getimg from the media/platimg addon is what you're after. Assuming that the issue with retrieving binary data to stdout using wget on windows gets resolved, this should work: ImgURL=: 'http://rosettacode.org/mw/images/c/c6/Pentagon.png' require 'media/platimg web/gethttp' RGBMatrix=: getimg gethttp ImgURL To test that this would work you could do: ('file'; jpath '~temp/Pentagon.png') gethttp ImgURL RGBMatrix=: getimg fread jpath '~temp/Pentagon.png' Given that it is currently necessary to download to file, readimg is better for now: ('file'; jpath '~temp/Pentagon.png') gethttp ImgURL RGBMatrix=: readimg jpath '~temp/Pentagon.png' ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
