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Improvements To Desaturation And White Point Adaptationįor this part, I had to ask (OTOY forum nickname), one of the software engineer at OTOY and he explained me the following: The “flat/legacy” (old color pipeline) described just above, is most likely to disappear as well, in the future. Quoting the forum change log: “Spectral colors produced by daylight models, blackbody emitters and spectral OSL textures are now interpreted relative to a standard D65 daylight white point.” and is available in the kernel settings (path tracing kernel in the GIF above) as it is not a “post-image white balance modification” but instead, happen at light-calculation level.
#Octane render demo series
Has been added, the CIE Standard Illuminant D Series D65. For instance, if you color pick a “neutral grey” and it is achromatic without any color temperature (cold or warm grey), it is most likely based on this CIE E Standard Illuminant. Previously, Octane was using the (now displayed as) “Flat” option based on the (hypothetical reference radiator) CIE E standard illuminant resulting in constant spectral radiance regardless of wavelength which is used in many graphical applications. Using Filmic by Troy Sobotka via OCIO for this test. The highlights are no longer clipping and instead, preserved. ✅The third image is the same as the second one but with (“filmic”-)“tone-mapping” applied before the output device transform.Also wrong since the sRGB EOTF (it does not matter which specification) is not designed for scene-referred HDR “tone-mapping”. ❌The second image is the Linear-sRGB being a linear function (commonly seen as “1.0 Gamma”) but this time, conformed to an sRGB monitor with the sRGB EOTF (“~2.2 gamma”) and no other processing.Having a Linear-sRGB is not wrong by itself, displaying a Linear-sRGB (scene-referred and high dynamic range) image is, without conforming it to display-referred. ❌The first image is the Linear-sRGB result wrongly displayed to the monitor, hence why this “darker look”, there is a mismatch between the Linear-sRGB and the non-linear encoding for a given “sRGB-based” monitor or display device, so to speak.That said, they are (the settings) very important when doing live-preview rendering and in production, previewing needs to be done accurately via the native options (usually not enough) or via OCIO which opens the door for any custom color encoding system (ACES being one of them as some others such as Filmic OCIO, or it can be a proprietary one specifically made by a studio). It does not matter how we set-it up, because the scene-referred OpenEXR is unaffected by these settings. (click to open the documentation page about it). Whenever a render is live in the Octane Render View, Octane applies a preview-only image processing, via the “Camera Imager Settings” node. Because ACES is the color management system used, the option (listed just above) “Linear-sRGB” is no longer valid and ACEScg(-Linear) is “the equivalent in ACES”, so to speak, since in reality, Linear-sRGB and ACEScg (linear by nature) have different specifications. This is what everyone should be selecting when exporting linear-scene-referred OpenEXR files for post-production.ĪCES 2065-1 (AP0 primaries), the “ACES color space” which is linear-scene-referred.ĪCEScg (AP1 primaries) which is also linear-scene-referred is what everyone should be selecting when exporting linear-scene-referred OpenEXR files from the renderer. Linear-sRGB (scene-referred) used for (linear-workflow) high dynamic range scene referred (EXR export for instance) is an RGB based color space using sRGB (BT.709) primaries and a linear transfer-function. “sRGB” (non-linear) color space (display referred) or more precisely IEC 6, which is a common display-device (computer monitors for instance) "standard color space”. Octane has the following built-in color spaces: