18-11-2021, 07:27 AM
This is part of the usual problem with interlace. Spatially adjacent lines are a whole field apart in time. It's very difficult to disentagle this when manipulating pictures. Converters such as the Aurora and Hedghog don't even try. They just treat each field separately. The Pineapple converter had switchable modes. There was one mode that interpolated spatially adjacent lines. Lovely on still images but horrible as soon as anything moved. You've probably seen something similar on some flat screen TVs where movement looks horrible.
A standard crosshatch pattern with a line of white on each field is actually vertically aliased, witha sudden transition from back to white. This can also be true of computer originated graphics. There is no perfect way to change the number of lines in the presence of aliasing. Either you have to blur the picture vertically or accept overshoot and ringing.
A standard crosshatch pattern with a line of white on each field is actually vertically aliased, witha sudden transition from back to white. This can also be true of computer originated graphics. There is no perfect way to change the number of lines in the presence of aliasing. Either you have to blur the picture vertically or accept overshoot and ringing.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
