seanc@pro-party.cts.com (Sean Cunningham) (04/29/91)
In-Reply-To: message from dltaylor@cns.SanDiego.NCR.COM I enjoyed your message, but felt that I must make a correction with regards to your claims on NTSC video. NTSC has 525 horizontal scanlines, of which, 480 +/- 3 are actually used for the picture. Vertically, about 330 lines at best are broadcast. So here you have 330 lines across, and 525 up...but these don't necessarily equate equally to pixels. For video gear, 400 lines of resolution or better is needed to be considered broadcast quality...even though the extra resolution is never broadcast, it helps during the editing process where one or more dubs may be used. There are moniters out there that can display some 800 lines of resolution...but you won't find a video deck that can record NEAR that. There are some professional cameras that will already handle 800 lines, but the recording technology isn't ready to handle it all yet. ED-Beta is probubly on top with 520+ lines of resolution. Digital video is probubly the only way we'll do much better than this...but since HDTV, in some form or other, will be the next standard, 800 lines will seem coarse! Sean >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> .SIG v2.5 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< UUCP: ...!crash!pnet01!pro-party!seanc RealWorld: Sean Cunningham ARPA: !crash!pnet01!pro-party!seanc@nosc.mil Voice: (512) 992-2810 INET: seanc@pro-party.cts.com ____________________________________ // | * All opinions expressed herein | HELP KEEP THE COMPETITION UNDER \X/ | Copyright 1991 VISION GRAPHICS | >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
msiskin@css.itd.umich.edu (Marc Siskin) (04/30/91)
In article <8910@crash.cts.com> seanc@pro-party.cts.com (Sean Cunningham) writes: >In-Reply-To: message from dltaylor@cns.SanDiego.NCR.COM > >I enjoyed your message, but felt that I must make a correction with regards >to your claims on NTSC video. And I to your claims.... > >NTSC has 525 horizontal scanlines, of which, 480 +/- 3 are actually used 504 +/- are used (525.5 - 21 lines for sync information. The 480 lines you refer to are the best resolution (not number of lines) you normally get from Broadcast TV. Resolution is how well you can resolve closely spaced black and white lines. the Higher the Number the more lines per unit (not sure which unit they use) you can see. Resolution is limited by the high frequency componant of the signal. The higher the frequency, the more lines of resolution possible. >For video gear, 400 lines of resolution or better is needed to be >considered broadcast quality...even though the extra resolution is never >broadcast, it helps during the editing process where one or more dubs may >be used. Good point here. The higher the resolution before the degradation of transmission the better looking the picture on the TV (not monitor). Look at pictures recorded by TV Newscrews and those shot by home camcorders and you will see a difference. The TV stuff will look sharper because they are recording more resolution information than the camcorder does. Also try looking closely at a still image of a VHS tape. You should notice that there is a LOT of noise that you can see in pause that you can't see in motion. The home formats take advantage of the randomness of noise and the fact that the human eye doesn't retain images very long. > >Sean > > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> .SIG v2.5 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<< > UUCP: ...!crash!pnet01!pro-party!seanc RealWorld: Sean Cunningham Marc Siskin, Senior Media Designer and Video Engineer for the Language Lab at the University of Michigan. std. Disclaimer. Msiskin@shogun.css.itd.umich.edu Marc_Siskin@ub.cc.umich.edu userHEBE@umichub.bitnet