Archived posting to the Leica Users Group, 1999/10/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From: Erwin Puts <imxputs@knoware.nl> Sent: Wednesday, October 13, 1999 20:15 Subject: [Leica] do your homework, please! > Below the real figures. 5 microns equals > 5/1000 mm and thus equals 200 lines/mm or > 100lp/mm 250lp/mm equals 500 lines/mm equals > 2/1000 mm. Agreed. My mistake. > This statement is false too: > "Digital means a symbolic representation, > period." No, that statement is true. > In fact "Digital" means using only the digits 0 > and 1 ... No, digital applies to any type of symbolic representation. The first digital computers used base 10. > A symbolic representation refers to anything that > can carry a meaning and acts as a proxy to that meaning. Yeah... a digital representation. > The current French philosophers are masters in the > art of naive nonsensical discourse based on hardly > or falsely understood modern science. I'll take your word for it. How is that germane here? > The human eye uses cones and rods, and the less numerous cones are > responsible for color vision. Yes. Just like a mosaic filter over a CCD. And the cones sensitive to green light are much more numerous than those sensitive to red and blue light--which is why CCDs have more green-filtered cells than red- or blue-filtered cells. The whole idea, after all, is to produce images suitable for human viewing. > The tri-stimulus mechanism has a very superficial > resemblance to the CCD mechanism in the popular digital > camera ... The resemblance to a CCD is far greater than the resemblance to film. > Any CCD sensor signal can be recorded as an analogue signal, > no need for a digital capture here. So digital and analogue can be > mixed as it is in the eye. Digital and analog are always mixed. The advantages of digital apply only in the digital realm, however. -- Anthony