> -----Original Message----- > Superposing a finite set of semi-transparent dots will never > give an opaque one (and that is true of physical dots too).
Indeed not; this is an ideal case of the Beer-Lambert law. Nice to know that basic chemistry has applications in computational graphics ... S Ellison ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.