Service manual

CTI
At CVBS video signals, the bandwidth of color signals is limited to 1/4 of the luminance
bandwidth. Transients between areas of different color are therefore not very sharp. The
PICNIC can increase these transients artificially with a time manipulation algorithm.
Dynamic Contrast
To make the contrast (black/white) range wider, Philips has invented Dynamic Contrast.
It uses the digital memory used in digital scan sets. It measures every A-field (25 x/s)
and digitally analyses where on the grayscale most of the image is located. If it is a
relatively dark image, the lighter part of that image is stretched towards white, so that
more contrast will become visible in that picture. If it is a relatively light image, the
darker part of that image is stretched towards black, so that these darker parts will have
more contrast. When the image is in the middle of the grayscale, both dark and light
parts are stretched.