Comment by diskzero

I worked at DreamWorks Animation on the pipeline, lighting and animation tools for almost ten years. All of this information is captured in our pipeline process tools, although I am sure there are edits and modifications that are done that escape documentation. We were able to pull complete shows out of deep storage, render scenes using the toolchain the produced them and produce the same output. If the renders weren't reproducable, madness would ensue.

Even with complete attention to detail, the final renders would be color graded using Flame, or Inferno, or some other tool and all of those edits would also be stored and reproducible in the pipeline.

Pixar must have a very similar system and maybe a Pixar engineer can comment. My somewhat educated assumption is that these DVD releases were created outside of the Pixar toolchain by grabbing some version of a render that was never intended as a direct to digital release. This may have happened as a result of ignorance, indifference, a lack of a proper budget or some other extenuating circumstance. It isn't likely John Lasseter or some other Pixar creative really wanted the final output to look like this.