Sophisticated computer motion estimation and field blending is usually used to convert NTSC video to 24 frames-per-second – something which could not have been done until recently, and still does not yield as realistic results as PAL filmizing conversion.
Interlacing results in a type of motion blur known as "combing", and also shows "interline twitter" where vertical details approach the resolution limit, neither of which occur in film.
[citation needed] The result gives half the vertical resolution of the original frame, and sometimes adds a jagged effect to the picture.
This discrepancy can increase as the film becomes worn with use, causing the sprocket holes to become more and more enlarged, thus allowing more error in frame position.
When film is scanned so that an electronic (video) copy can be made, various means are used to help ensure that the variations in frame position as a result of sprocket hole wear are minimized.
US productions most often use actual film for prime time dramas and situation comedy series and filmizing is more common outside North America.
BBC hospital drama-soap Casualty also flirted briefly with the filmizing process in the mid-1990s, but it was quickly dropped after viewer complaints that the show "looked wrong."
The decision to filmize was later reversed, resulting in a negative response to the film-style lighting which came across poorly on the unprocessed video footage.
Filmizing success stories include The League of Gentlemen, Spaced, The Office and Heartbeat, all of which can fool most people into believing they were shot on film.
This error caused alarm amongst the show's fans amidst fears that a permanent switch to video was being made indicating the success of the filmizing technique on this production.
The Fox show Arrested Development used an elaborate post-production process to adjust colors and brightness levels to match those of film stock.