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Re: Slides from Digital files Technical aspects

  • Subject: Re: [iris-photos] Slides from Digital files Technical aspects
  • From: cathycampi@aol.com
  • Date: Fri, 7 Mar 2003 13:46:01 EST

In a message dated 3/6/03 9:49:27 PM Pacific Standard Time, jijones@usjoneses.com writes:

I have never done this, so I don't know what the quality of the
projected image is. However, slides are usually considered to be 2500
dpi. How sensitive are the produced slides to the resolution of the
digital image?

John                     | "There be dragons here"

The quality of the original picture would be the primary factor. Digital images are captured using  one pixel for R ,G or B depending on which one is strongest. This means your three megapixel images equates to a one megapixel RGB Image.The camara software, just like your computer software, interpolates "estimates" what colors should be between these pixels and creates an artificial 3 megapixel image. It is just not possible to get get slide film quality with this technology.

Foveon,Inc developed an image sensor with three layers of photodectors and captures R G and B for each pixel. Slightly better than slide film quality. Sigma's SD9 , for example, has this sensor and is a mere $1,800.00 plus lens etc. . Guess we poor amatuers are going to have to wait a couple years.

Want to test your image? Cut a half inch by half inch section of your photo. Modify this file to 2500 dpi. File will be 30+ TIMES LARGER. Set your screen to view actual pixels. Back away to same distance you would be from your projector screen. This is not exact, just an approxiamation. 

Michael,Using slide film for slides and digital camara for FUN!

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