Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site peora.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!vax135!petsd!peora!jer From: jer@peora.UUCP (J. Eric Roskos) Newsgroups: net.rec.photo Subject: Re: Slide film vs Color Neg. film Message-ID: <1775@peora.UUCP> Date: Tue, 5-Nov-85 08:50:05 EST Article-I.D.: peora.1775 Posted: Tue Nov 5 08:50:05 1985 Date-Received: Thu, 7-Nov-85 04:29:02 EST References: <298@tekig4.UUCP> <349@vaxwaller.UUCP> <5746@tekecs.UUCP> <1750@peora.UUCP> <218@astroatc.UUCP> <292@mhuxl.UUCP> Organization: Perkin-Elmer SDC, Orlando, Fl. Lines: 45 > The color rendition of color negative films can only be true if you shoot > a grey scale on one of the frames on each roll so the lab knows what filter > pack to use when printing. All color negatives I have seen have an > orange mask and need a strong compensating mask when printing, but in > addition need tweeking to make white truly white. I must admit that I have come to have doubts even about the need for distinct color compensations among prints made from the same batch of film on the same paper. For a long time I used a color analyzer, with a photograph of a Unicolor grey card on each roll, to get the color just right. This worked fine, but soon I found that all the photographs made in the daylight on Vericolor III film printed on paper from the same box had the same color correction. Variations occurred for photographs made in the early dawn or late evening, but it is debatable whether these should be corrected. I had a photograph of a sunrise over the Atlantic Ocean which bothered me for awhile, because the sky was green; so I went to some trouble to color correct it to have a normal "blue" sky. However, later I saw another sunrise, and realized the sky was green at that time of morning over the ocean! On the other hand, you can make photographs made in awful yellow light come out fairly well (all things considered) with proper color correction. > As you know, slides come out with as true a color as you are ever > going to get. In fact you can compare the print with the slide and > see if the print is right. You can never do that with a negative. The "you can compare your prints to the slides" seems to be the current justification Herb Keppler gives for his anti-print editorial position in Popular or Modern Photography magazine (I have some trouble telling those two apart, except that Modern has more trustworthy ads). However, this assumes the colors were right on the slide in the first place... and how do you compare a slide with a print, anyway? > 2: The slide film has better latitude and contrast range. Neither of these is correct. Print film has a lower contrast than slide film, allowing it to capture a wider range of luminances in the original subject (this also gives "wide exposure latitude"). -- Shyy-Anzr: J. Eric Roskos UUCP: Ofc: ..!{decvax,ucbvax,ihnp4}!vax135!petsd!peora!jer Home: ..!{decvax,ucbvax,ihnp4}!vax135!petsd!peora!jerpc!jer US Mail: MS 795; Perkin-Elmer SDC; 2486 Sand Lake Road, Orlando, FL 32809-7642