Susan E. May |
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DIGITAL & OPTICAL zoom
Ok, I've gotten the book (How to take...and LOVE IT) but I really don't know the difference (still) between DIGITAL AND OPTICAL zoom. Perhaps I've forgotten? :) My photos LOOK good on the camera then print out bad. What could that be? I have a Kodak DC4800 digcam & Epson 870 photo printer using Redriver paper...
August 18, 2002
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John A. Lind |
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Susan, Optical Zoom:
Uses only the lens optics to change focal length. The entire CCD inside the camera is used to capture the image. Digital Zoom:
Uses the lens optics at maximum focal length plus uses only a portion of the entire CCD inside the camera to capture the image. The longer the effective focal length using "digital" zoom the smaller the area of the CCD that is used. This is effectively cropping an image and then enlarging it. You *will* lose resolution for the image in doing this. In other words, using the digital zoom collects *less* information from the CCD. If an algorithm is used to increase the file size to the same as if the entire CCD were used, it can only interpolate using the information collected from a smaller area of the CCD and employing a form of averaging method to fill in the holes. -- John
August 25, 2002
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- Carol Engstrom
Contact Carol Engstrom
Carol Engstrom's Gallery |
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Thanks for this great explanation, John. I've had the same question.
August 26, 2002
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