Finally, you can set up a list of default rules for how you want Maya to handle input textures, based on the file extension or the path on disk. Remember that these rules are just guesses, and will not be smart enough to tell the difference between a color texture convert this! This is different per-render engine. The rules are otherwise the same… transform the input texture from the appropriate input space Utility — blah blah blah to the ACEScg space, then save the file.
Since you have Houdini, you can use COPs to transform your textures natively rather than relying on OpenImageIO or an external compositing program to convert them.
Something to keep in mind specifically when using the File COP in Houdini is that it tries to linearize your textures for you! The space to write to is dependent on your own local color pipeline. If in doubt, ask your colorist.
Your working space is ACEScg. Before writing final images to disk, use the OCIOFileTransform node to convert your comp into the appropriate delivery color space. In situations like this, you have a couple of options, depending on where in the process you are. This will ensure that, perceptually, the opposite of your viewer LUT, including the RRT S-curve tonemapping mentioned earlier, will be applied to your texture, so it will look exactly the same coming out the other side of ACES.
This means that your output color values might come out pretty weird! Take a look at this screenshot and pay close attention to both the OCIO Transform settings and the color info window that appears over the render on the left.
Other colors might also be affected in strange ways by this process, especially when dealing with very bright or saturated colors. Keep numbers like this in mind when debugging issues with global illumination or weird reflections or other render glitches, or when grading these renders after rendering!
On the compositing side, your best option for solving this same problem is simply exiting ACEScg space temporarily. It is also important that ACES allows you to create archival materials with a high dynamic range and wide color gamut, even taking into account possible future devices. One of the benefits of the ACES system is that it provides Output Transforms for a wide assortment of displays and projectors. You'll want to choose the appropriate Output Transform for your situation based on the following factors:.
The D60 native white point of the ACES system was chosen because experiments showed that humans subjectively preferred D60 over other white points such as D It is also closer to the white point of the motion picture system. If the creative white chosen for your project is D60 but you need to work on a device calibrated to D65, the "D60 sim. Nevertheless, some people prefer using the non-"D60 sim. Click Custom. Click Add. Each receptor transmits collisions as signals - which together, our brains combine and translate into images.
ACES represents and range of hues and brightness values that closely matches that which the receptors in our eyes are capable of perceiving. The realism is due to the extended dynamic range that ACES provides. There are three important benefits that come from this: Highlights - Because of the increased dynamic range your highlights and shadows will have more detail.
It takes a much more extreme light or camera exposure to get pure white clipping to be visible in your renders. Colors - Colors will desaturate as they are lit by brighter and brighter lights sources, just like a you as the human eye would sees perceives them in real life. Effort - Digital artists tend to have a much easier time achieving accurate, photo-real renders images using ACES than with other colorspaces.
Because of this they attain results with less or equal effort with better results. Below are two images clearly demonstrating why one would want to render using ACES. Two important differences to talk about between these images are the highlights and the difference in brightness. For the highlights notice in the sRGB images how the highlights seem to be clipping. They completely click to white with a complete loss of any detail. Additionally you'll notice that the bright colors in the sRGB images start to shift very unrealistically towards yellow.
In the ACEScg image these highlights retain a lot of their detail and the colors start to desaturate as they brighten. This desaturation is behaviour we would observe in a photograph and see with our own eyes.
There is also a noticeable difference in brightness. This is due to the much higher dynamic range of ACEScg. More brightness values are being crammed into the image. You will get a much more realistic render using ACES but you will also have to light a little differently; you can use much more realistic light values. Buy online Find a reseller Renew or upgrade. Close search What are you looking for?
What is ACES? What makes ACES better? Why are there so many different flavors of ACES? How will ACES affect my workflow? Conclusion ACEScg is now the new standard color space that is being used natively by both input systems just as cameras, as well as output programs like V-Ray. Try V-Ray for Maya free for 30 days. Boost your VFX workflow. Get started. Related articles. Explore CG Labs.
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