<p dir="ltr"><br>
On May 23, 2014 9:12 AM, "Sean Kennedy" <<a href="mailto:mack_dadd2@hotmail.com">mack_dadd2@hotmail.com</a>> wrote:</p>
<p dir="ltr">> It made sure that no matter what a compositor did, the blacks wouldn't go too dark and the brights would never get superbright.</p>
<p dir="ltr">When _working_ in the scene referred HDR domain, there is no notion of superbright. It is precisely why lift, gamma, and gain doesn't work on scene referred data.</p>
<p dir="ltr">When transferring to the display referred system at the tail end, it is necessary to assign a scene referred value to display referred RGB = 1 as diffuse white, and scale the scene referred data to it.</p>
<p dir="ltr">My only concern is assuming that 1.0 has any meaning while doing the bulk of the work in the scene referred model. It doesn't. It would _always_ limit one's working model to ~2.5 stops of latitude, which is rather silly.</p>
<p dir="ltr">A flexible clamp node however would be excellent assuming it is versatile and can be used on a full range of scene referred / HDR values. Even a clamp / scale node that allows an artist to scale values arbitrarily to slide blacks and whites to their correct printing densities.</p>
<p dir="ltr">With respect,<br>
TJS</p>