Psychovisual Enhencement

[olnima]

What exactly are they doing?
What is the difference between mask and sharpen?
Do both of them (mask and sharpen) makes resulting files smaller when using them?

Thanks in advance,

Olnima

[tomos]

well from here (divxs site) (http://forums.divx.com/eve/ubb.x/a/tpc/f/401101651/m/944105352/r/289106452)

Shaping attempts to enhance fine details in the texture and mask differences between the source and encoded video in complex textures, which makes them much less noticable. In other words, it shapes the texture based on certain parameters.

Masking uses a slightly different algorithm, whereby each block in the frame and the surrounding blocks are analyzed such that the psychovisual enhancement introduces minimal artifacts.

Generally, we feel Shaping produces better results in almost all circumstances. Masking may be more visually pleasing for anime sources.