Maya 2022 ocio4/12/2023 Wider color space: In 3D rendering, we use ACEScg, which is much bigger than the common sRGB.Having introduced the concepts of color space and linear workflow, we’re ready to talk about how ACES can improve our renders. However, we can do even better regarding the quality of our rendered scenes. That’s terrific for a correct and standard workflow. Autodesk Maya, for instance, utilizes this linear workflow. On the other hand, by following this workflow, we’re sure that the calculations are accurate and that we obtain a physically correct result. Specific steps in linear workflow-linearized inputs, calculations, and sRGB LUT to gamma correct the final rendered image. Without a proper sRGB LUT or a correct way to linearize our inputs, we wouldn’t be able to obtain an accurate representation of the rendered scenes. We then need an sRGB LUT to correct the rendered image and make it linear to the viewer. The render output is linear, but the monitor gamma, as we saw, is 2.2. If something is already linear, like float images (HDRI), we leave them as they are-bump, displacement, normal maps, etc., don’t need to be linearized. SRGB images need to be linearized, as well as the colors. Linear Workflow: from the inputs to the final render on screen. Here’s a typical example of linear workflow with inputs, calculations, output, and the final gamma correction applied to the output (sRGB LUT) in order to have a correct image on the monitor. In 3D rendering, all the calculations need to be treated linearly so that if we double the light intensity in our scene, we also have to double the color values of textures and shaders. Even if the LCDs and newer monitors don’t suffer from this problem, gamma 2.2 has been maintained to preserve compatibility with the old CRT monitors. The reason behind monitor gamma 2.2 is historical it comes from the old CRT monitors, where there was no linear response between the light intensity and the electron gun voltage. If images weren’t gamma corrected, the monitor would show a darker image, which isn’t good. When we open an sRGB image on a calibrated monitor using sRGB, we see it correctly because the gamma correction applied to the saved image (0.45) is combined with the monitor gamma of 2.2 to give a linear response, and that’s what we want. Image via PBR Linear Workflow.īefore introducing ACES, we still need to know what a linear workflow is and why it’s essential while rendering. What Is a Linear Workflow? A general example of gamma correction for sRGB images. Nowadays, monitors and TV need to have the capabilities to deal with them. Many monitors rely on it to represent the images.Ĩ-bits per channel is sufficient to cover the sRGB color space-if we wanted to extend the dynamic range, for instance, with a DCI-P3 color space-we need at least 10-bits per channel. The most common color spaces are sRBG, AdobeRGB, DCI-P3, and Rec.2020, to name a few, with sRGB being the smallest color space on the list. In this last case, we say the monitor is 100% sRGB.Īlso, most images from the internet (JPG, PNG, etc.) come with a saved color profile which is sRGB, and that preserves a standard in file interchanging. The gamut can also be smaller than the current color space or encompass it. Simply put, a color space describes the colors available in a particular subset-referred to as the standard CIELAB-and also represents a color profile for digital media.Ī color gamut contains all the colors that a device can produce, and when a monitor is manufactured and calibrated to use sRGB, for instance, its colors are mapped to the sRGB color space coordinates. What Is a Color Space? Example of color spaces from CIELAB. In this article, we’ll talk about the ACES workflow for 3D renders, and, for the occasion, we’ll consider a specific color space called ACEScg.īut let’s take it one step at a time. Additionally, and more generally, it’s a set of rules for encoding data and managing a color workflow. It’s thought to be a standard for interchanging image files and a way to create better lighting in 3D. Now, let’s go all in.ĪCES stands for Academy Color Encoding System. It’s used in filmmaking, CG Animation, and VFX. What is it? Let’s ease into it with an entry-level description: ACES is considered the industry standard for color. (Also, an explainer: What exactly is ACES?)ĪCES. Learn how to improve your 3D renders by using ACES to build a linear workflow.
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