Frame Controls: Anti-Alias & Details Level

Can anyone give me a general rule of thumb as to when these need to be used, and exactly how much. 1-100 seems like a lot of leeway...
Thanks.

Those settings are not very well documented. Here is what the Compressor User Manual says:
Adaptive Details: Select this checkbox to use advanced image analysis to distinguish between noise and edge areas.
• Anti-alias: Use this slider to set a softness level from 0 to 100. This parameter improves the quality of conversions when you’re scaling media up. For example, when transcoding standard definition video to high definition, Anti-alias smooths out jagged edges that might appear in the image.
• Details Level: Use this slider to set a level (from 0 to 100) to preserve sharp edges. This is a sharpening control that lets you add detail back to an image being enlarged. Unlike other sharpening operations, the Details Level setting is able to distinguish between noise and feature details, and generally doesn’t increase unwanted grain. Increasing this parameter may introduce jagged edges, however, which can be eliminated by increasing the Anti-alias level.
Note: Adaptive Details, Anti-alias, and Details Level pertain only to frame resizing (scaling), not deinterlacing.
You really have to do some tests, as this depends on the kind of content and the source/delivery frame size.
I watched a presentation from WWDC 2007, where Doug Werner, who compress video for http://www.apple.com/trailers (using Compressor - which is not a toy as some may think), said he used to choose a Detail Level of 50, when downscaling from 1080p to 480p, but for that particular clip he changed it to 20 (Resize filter was set to Better, and Adaptive Details was not checked). Apparently, sharpening also applies to downscaling and not only to enlarging as the user manual might indicate.
To really get the best results, do some short tests on relevant parts of your media before you apply your settings or save them as presets, because there is a lot of different content that has to be handled in different ways.
I guess the general rule of thumb would be: Test, test, test, and use what you see and learn from the results to fine tune your settings for that particular type of content. Action content with a lot of fast cuts and motion, often demands more care and attention than the opposite.
Use the recommendations/tips from others to guide you in the right direction, but use the settings you think looks the best in the end.
Good luck!

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