I doubt a display profile is applied to a video signal on the Mac? If you open the profile that you think is used to manage the signal, in ColorSync Utility, if you find the VCGT does not have linear curves, I would say you have a case. But I have my humble doubts. If you want to be sure no transform occurs, select a generic profile like sRGB which does not contain any calibration to my knowledge. An alternative is to run the software from a different OS... Best / Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of sirquijote@lavabit.com Sent: Thursday, January 3, 2013 11:57 PM To: colorsync-users@lists.apple.com Subject: Disabling colour management for a display Hi, I'm trying to use my MacBook Pro to send calibration patterns to an HDTV over a TB->HDMI cable. These patterns are to be read from the screen using a DTP-94 and ColorHCFR, a free display calibration tool. However, it's essential that these patterns reach the HDTV unmodified, and as far as I'm aware OS X applies a display profile to all outgoing video signals. As a result, the video patterns would differ from what was expected and so the calibration would be affected. So, first question: am I right in assuming that a display profile is always applied? OS X seems to assign a generic profile no matter what I do, but maybe it simply acts as a passthrough? Second question: if I'm right and OS X always assigns a modifying display profile to any given display, is there any way of disabling it, even temporarily? Thanks. _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/graxx%40videotron.ca This email sent to graxx@videotron.ca