CBS Is Divided Over the Use Of False Images In Broadcasts
CBS News anchor Dan Rather calls decision to superimpose digitally created CBS logo to block out NBC-sponsored sign in Times Square during CBS's news coverage of New Year's Eve celebrations 'a mistake' that he regrets; CBS decision to use form of technology that allows electronically created images to replace actual structures has stirred debate inside CBS News; CBS News president Andrew Heyward, responding to questions about article on topic in Jan 12 edition of The New York Times, defends CBS's use of technology, developed by firm called Princeton Video Image; network has regularly used it on its morning news program, The Early Show, to display CBS promotion; adds Rather has not been part of 'internal discussion' about using technique; CBS Television president Leslie Moonves supports Heyward, who says there has been 'vigorous debate' on use of technology inside CBS News; Jeff Zucker, executive producer of NBC's Today program, says NBC was offered same technology and passed on it; ABC News spokeswoman Eileen Murphy says ABC decided not to use technology (M)