Centratura e larghezza si modificano in questo modo (dal tutorial di winmodelines):
Codice: Seleziona tutto
Modeline "Description" FF.FFF HHH HHI HHF HHT VVV VVI VVF VVT (options)
The following simple modifications can be done without redoing the entire mode.
Position shift: to shift the picture left or right add or substract the number of pixels you want to shift to the HHI and HHF values equally. Keep in mind the limits: HHI cannot be less or equal than HHH and HHF cannot be greater or equal than HHT.
The same procedure is used for vertical shifting with values VVI and VVF.
Size/resolution reduction to reduce picture size lower HHH or VVV. This will cut the picture from its right or bottom side respectively, leaving black bars and keeping pixel aspect. Once done, you will have to select the new resolution and may have to center the picture again (position shift).
Picture width: it is possible to adjust picture width keeping the same resolution by adjusting pixel aspect. Modify HHT, a lower value means wider pixels. Then FF.FFF has to be recalculated multiplying HHT by the desired horizontal frequency in MHz, that is 0.015625 for PAL, 0.015734 for NTSC or 0.02496 for 25kHz arcade screens). HHT cannot be less or equal than HHF and FF.FFF must not exceed the maximum pixel clock allowed by the video card.
Riguardo la luminosità, già dai tempi di advmame sotto dos notai questa cosa. Risoluzioni uguali (Hz compresi) con luminosità diversa.