On: Tue, 18 May 2004 Tim Wheeler wrote:- > Do you think the colour fringing or chromatic aberration is made on the > neg by the camera lens, or in the scan, by the scanner's CCD?
The camera lens - let me explain. Digital light sensors are only one pixel in thickness, meaning that a specially designed lens has only one pixel to focus upon....whereas film has a physical depth, meaning that chromatic abberation will by default, if using a good lens, cancel itself out. A scanner CCD does not cause chromatic abberation, but its lens can - if it is incorrectly computed. However, what might appear to be chromatic abberation, is in fact, what is called 'blooming'. This is caused by line edge contrast overloading adjacent pixels. This is common to most CCD scanners. You do not get blooming with drum scanners. I do hope I have clarified what is being discussed. William Curwen http://www.william.ws =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
