<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span style="font-size: 31px; ">Hey Troy,</span><div style="font-size: 31px; "><br></div><div><span style="font-size: 31px;">I hope you know I really appreciate your expertise on gazzilion matters (I've asked you several questions and appreciated your answers on matters I didn't even realized existed), but here in this thread let's try to be practical, which means (I know you hate this) let's try to "make stuff work".</span></div><div><span style="font-size: 31px;">Let's try to forget about all "ICCGFD, GH54321, 621111" stuff and others. Let's focus on CLAMPING.</span></div><div><span style="font-size: 31px;">When I say: "clamp blacks" I always mean: set every value below 0.0 to 0.0.</span></div><div><span style="font-size: 31px; ">When I say: "clamp whites" I always mean: set </span><span style="font-size: 31px; ">every value above 1.0 to 1.0.</span></div><div><span style="background-color: transparent; font-size: 31px;">Every compositing artist will know what I mean.</span></div><div><br style="font-size: 31px; "><div style="font-size: 31px; " apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Bartek Skorupa</div><div><br></div><div><a href="http://www.bartekskorupa.com">www.bartekskorupa.com</a></div></div></span></span></span>
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<br style="font-size: 31px; "><div style="font-size: 31px; "><div>On 23 maj 2014, at 20:44, Troy Sobotka <<a href="mailto:troy.sobotka@gmail.com">troy.sobotka@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><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>
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