Originally Posted by wmcclain
I would set everything back to zero and start fresh with the calibration disc.
I don't have the Disney disc but have heard good things about it. There is also a free downloadable disc here on the forum: AVS HD 709 - Blu-ray & MP4 Calibration
. You'll want the AVCHD version for OPPO. Either burn it to a DVD or copy it to a USB device.
The Disney WOW disc works fine, but it does have one guidance which I disagree with:
It instructs you to raise White levels (Contrast control) until Peak Whites above Reference White are no longer distinguishable.
Now some TVs can't reproduce Peak Whites well or at all. Some TV's color reproduction may clip up there before other colors leading either to color tinted whites or complete clipping, and so long as you can reproduce up to Reference White accurately that's "good enough". Also raising Contrast in this fashion does raise the overall light output up there which is important if your display is light challenged, perhaps because you don't view in a dimly lit room.
But if your display CAN reproduce Peak Whites accurately, and if you don't NEED the extra light output to produce a pleasing Reference White (i.e., not gray or dingy), then it is better to lower Contrast until the Peak Whites (Luma values from 236 through 254) become visible.
It is pretty common for content to include Peak White pixel values -- sparks, glints, highlights in clouds. By calibrating so these can still be seen you retain more interest in the picture.
If your display is light challenged for Reference White when you do this, then a compromise setting of lower Contrast which still allows SOME of the Peak White range to stay visible is still preferable.
For Newbies: Any display will have an upper limit on how bright it can get. The Contrast setting adjusts which Luma (gray scale) pixel value triggers that max light output from the display. Any pixel values above that will be indistinguishable because they can still only be reproduced as that SAME max light output. By lowering Contrast you reduce the light output of any given pixel Luma value but also allow higher Luma values to become distinguishable.
A professional calibrator (an ISF Tech) would use an optical sensor -- a light meter -- to insure Reference White is producing the recommended light output for your technology of display, and adjust Contrast accordingly to achieve that while still keeping as much of the Peak Whites visible as your display can handle cleanly.