On 4 Dec 2003 at 18:03, John Francis wrote: > Sure, you don't get full resolution for every possible combination of colours. A > regular pattern of pure Red (or Blue) and black lines will resolve far less > lines/mm than a black-and-white pattern. You can also get nasty aliasing > artifacts with images with a high-frequency chroma component (just like on TV). > > But for real-world scenes (less than fully-saturated colours, and no chroma- > only boundaries), or for black-and-white test patterns, algorithms that favour > luminance over chroma will be able to resolve better than 2-pixel-wide lines.
And this is one of the main reasons that chromatic aberrations at high contrast boarders are so much more visible when shooting on digital media, very real- world. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
