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5.Depthoffield
‐Ausefulandsubtletechniqueforcontrollingthecomplexityofimagesisdepthoffield.
Æ
Post‐production
Becausepost‐productiontechniquesoccurlaterintheprocess,itisoftenpossibletoadjustthembased
ontheresultsoftestcompressions,makingfine‐tuningmucheasier.
1.Staticversusmovingimages
‐Asinproduction,superfluousmovingimagesaren’tappropriateforcontentthatyouplanto
aggressivelycompress.TheyarenotthatimportantforDVD,but
theyareforwebandCD‐ROM.
2.Motionblur
‐Inthesamewaythatareal‐worldshutterspeedintroducesmotionblurthathelps
compression,youcanusethevirtualshutterinrenderingapplications.Foreffectsthatsupportmotion
blur,renderthemwithashutterspeedthatmatchesthatofthesource.
3.Anti‐aliasing
‐Thisrenderingtechniquesoftenstheedgesofrenderedelements,lettingapixelattheedgeofan
areabeanintermediatevalue.Smoothingouttransitionsamongpartsoftheimageimproves
compressibilityandappearance.
4.Progressiverendering
‐Whenworkingwithinterlacedsourcevideo,itmaybeappropriatetorendermotiongraphicsas
progressivescanwhenmakingthecompressionmaster.Byrenderingtheprojectinprogressivescan
mode,youcandeinterlacetheinterlacedsource
,
butthegraphicalelementsremainaperfect
progressive.