RE: histogram from an image

I think that the example $ROOTSYS/tutorial/image/trans_graph.C can help you because it loops on image's pixels and plays with their colors.

-----Original Message-----
From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch] On Behalf Of Roger Mason
Sent: Thursday, January 29, 2009 3:58 PM To: roottalk_at_lxbuild091.cern.ch
Subject: [ROOT] histogram from an image

Hello,

I'm trying to make a one dimensional histogram (frequencies) of the grey levels of a JPEG image. I can't figure out how to access the pixel values of the image. Can someone point me in the right direction?

Thanks,
Roger

ROOT 5.20/00 (trunk_at_24524, Oct 01 2008, 15:00:00 on linux) Received on Thu Jan 29 2009 - 16:05:56 CET