Archived posting to the Leica Users Group, 1999/07/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jean-Claude- Interesting idea, but you would want to try using the three tri-color printing filters- RED25, BLUE49 and GREENsomething else- The values are in one of Kodak's books. I did an Interesting experiment to show a class in psychology the theory of color perception- taking three B&W photos, one each with a red, green and blue printing filter, making B&W slides with Kodak Direct Positive film and then projecting them through three projectors with each slide shown through the corresponding filter with which it was taken. I had to use three rolls of film, and different exposures to get three B&W slides that rendered anything close to true colors but it was impressive... I just don't want to try it again! I am sure that you could read the red, green, and blue light but it would be a very tedious process- similar to to the photo that I saw done of a landscape (seascape, actually)- everything was still except the surf. The photographer had made three exposure on the film- one through a red filter, one through a green filter, and one through a blue filter- using the internal meter. When the shot was printed- the beach and shore, cliffs, and rocks were perfectly registered- but the surf that had been in motion was a veritable rainbow! interesting shot! I am sure you could do it, if the shot was critical enough, and you had plenty of time!!! Dan - ----- Original Message ----- From: Jean-Claude Berger <jcberger@imaginet.fr> To: <leica-users@mejac.palo-alto.ca.us> Sent: Friday, July 16, 1999 1:04 AM Subject: RE: [Leica] "Filters for the 75/1.4M indoors?"- Certainly!Especially for ne... > Maybe its a stupid idea but did someone tried to measure, say, a grey > card with a light meter with a set of tree filters (CYM) and then try > to balance the 3 values by adding a blue filter until the reading of > the CYM filters are the same? Are the differences too subtle for an > handheld meter? Or is the color sensibility of a meter that different > of the one of the film? > > In a word, is there a way to emulate a thermocolorimeter with a simple > (but good) lightmeter? > > --- > Jean-Claude Berger (jcberger@jcberger.com) > Systems and RDBMS consultant (MCSE), Lyon, France > http://www.jcberger.com > > > Of Dan Post > > HAving shoot a bunch of film with these filters I can oinly > > say that with > > chrome, it is a 'shoot and try' situation since you cannot > > really adjust the > > rendering of the transparencies. >