![]() If you want to dabble in video, there is a lot you need to learn about video formats and standards to produce predictable and consistent results when you render.SAN JOSE, CA - Adobe is talking updates, to be available in October, to video tools within its Adobe Creative Cloud - there will be over 150 new features that include new capabilities in Adobe Premiere Pro CC, Adobe After Effects CC, Adobe SpeedGrade CC, Adobe Prelude CC, Adobe Media Encoder CC and Adobe Story CC Plus. If a compositer is not happy with the current level of specularity, they can adjust that specific channel. The multi-channel concept also reduces the necessity to "bake" in the aforementioned data to the final image. Since it can store arbitrary channels- specular, diffuse, alpha, RGB, normals, and various other types-in one file, it takes away the need to store this information in separate files. OpenEXR's multi-resolution and arbitrary channel format makes it appealing for compositing, as it alleviates several painful elements of the process. Some formats like Open EXR support even allow you to assign a bunch of random things to the available channels: It is common in professional 3D rendering to also include things like depth, occlusion, specularity and other things in the rendered files. Red Green Blue and Alpha channels are just the beginning. There are formats that support 10-bit, 12-bit, 16-bit and even 32-bit color per channel that also support 4 channels. I know that's confusing because it is easy to think of 32-bit formats as trillions of colors but when you are describing video formats a 32-bit file is a format with four 8-bit color channels, the fourth one being a grayscale alpha channel. For a video format to support Alpha Channels you need at least 8 bits per channel and four (4) channels for a total of 32-bits. Compressed formats are 8 bit color per channel for a with a total of 24 bits. ![]() Quicktime JPEG 2000, Cineware - free from GoPro, and several other formats support alpha channels. ![]()
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