AndyMan 7 #1 October 28, 2004 I was reading this review of the new Epson RD-1 Rangefinder, and was surprised to see that it sported modes for Green, Yellow, Orange, and Red filters. I was surprised to see these on a digital camera. I have a very basic understanding of the effects of colored filters on black & white film - such as red adding more "depth", but I do not understand the physics of why this works... Nor do I understand if these techniques transfer to the digital "lab". Is boosting the magenta channel in photoshop before dropping the saturation the same as using a real filter? Do colored filters have the same affect on B&W digital as they on on B&W silver? Can a "filter" be reliably added algorhythimcally, like in the RD-1? _Am__ You put the fun in "funnel" - craichead. Quote Share this post Link to post Share on other sites
genoyamamoto 0 #2 October 28, 2004 Filters only let that color pass thru to hit your recording medium. A #25 red filter will darken blue skies and accentuate clouds because the blue is prevented from hitting your b&w film. Red and green look similar on b&w film so one can use a green filter to darken reds. If you really want the best quality digital image i think you should go with a real filter, especially if you want to enhance the red channel. Most noise in digital cameras is in the red channel (go compare the red channel of any photo to the blue or green channels). There are some filters digital processing cannot mimic, for example polarizing filters. QuoteI was reading this review of the new Epson RD-1 Rangefinder, and was surprised to see that it sported modes for Green, Yellow, Orange, and Red filters. I was surprised to see these on a digital camera. I have a very basic understanding of the effects of colored filters on black & white film - such as red adding more "depth", but I do not understand the physics of why this works... Nor do I understand if these techniques transfer to the digital "lab". Is boosting the magenta channel in photoshop before dropping the saturation the same as using a real filter? Do colored filters have the same affect on B&W digital as they on on B&W silver? Can a "filter" be reliably added algorhythimcally, like in the RD-1? _Am Gotta go... plaything needs to spank me Feel the hate... Photos here Quote Share this post Link to post Share on other sites
marcin 0 #3 October 28, 2004 Are you saying that using a red filter on a Sony PC in b&w mode will produce the same "sky darkening" effect like on real film? This is not what I was told or experienced, but I'd be very interested in finding out how to achieve such effect. Quote Share this post Link to post Share on other sites
