what does "IOW" mean? so use mineral pigments rather than organic dyes. mineral pigment encodings of hundreds of years age are bought and sold for vast piles of money, implying stability.
--- On Sun, 2/26/12, gene heskett <ghesk...@wdtv.com> wrote: From: gene heskett <ghesk...@wdtv.com> Subject: Re: [Emc-users] Film Emulsion for Encoder Wheels? To: emc-users@lists.sourceforge.net Date: Sunday, February 26, 2012, 5:02 AM On Sunday, February 26, 2012 07:34:30 AM charles green did opine: > color photography is a whole other thing. why not make an rgb encoder > system? Most dyes are organic. Without resorting to expensive dichroric coatings on individually mounted chips of glass, it would likely fade and become useless in a few years. Sure, I have prints in my billfold that I shot and developed on unichrome paper in 1968, washed 10x what was required because I knew when I took the shot that it was my last chance to get a pix of my mother looking quasi healthy (she was dying of cancer and did some months later) but there is no way you could call that color accurate today. Semiconductor detectors are the most sensitive at 1100 nanometers, far infrared IOW, and require extensive layers of filtration so that their much less efficient detection of what we call white light, from a narrow band of energy from 670 nanometers (red) to about 400 nanometers (almost ultra violet) where they are only maybe 1% as efficient, is actually fairly difficult, and one of the reasons you can check your tv remote with a digital camera. Your eyes can't see that led, but the imaging chip in the camera, despite heavy filtering in front of it, can see it quite well. Your judgment of how well that camera does color (colored of course by your own color vision, or lack thereof) can often be made better with more IR stopping filters screwed onto the lens. The color errors it shows you are usually related to heating of the subject by the sunlight, and one of the reasons color is better at night when using the flash, which has relatively little IR output. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Necessity has no law. -- St. Augustine ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
