Los televisores no tienen por que tener píxeles cuadraticos, también pueden ser rectangulares.
De todas formas me he informado un poco mejor, y veo que hay otras resolución PAL:
=================================
(link roto)
PAL
PAL stands for the Phase Alternating Line. This is a video standard used by the color television industry and is the common standard used in Europe. This video signal format sets the video to playback at 25 frames per second which contain 625 lines of pixels in each frame.
There are various divisions within the PAL standard which determine what pixel and frame aspect ratios are used. These formats are as follows:
· PAL (resolution 720 x 486)
· D-1 PAL (resolution 720 x 576)
· D-1 PAL Square Pix (resolution 768 x 576)
D-1 PAL
The D-1 pixels used in the PAL format are displayed using a horizontal axis. This format uses the same standard frame aspect ratio as the PAL format. Unlike the PAL format, the D-1 PAL uses a 720 by 576 resolution.
D-1 PAL Square Pix
This format uses the same standard frame aspect ratio as the PAL format. Unlike the PAL format, the D-1 PAL Square Pix uses a 768 by 576 resolution using rectangular pixels.