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MAME and MESS wrong colors with yiq_enable 1
#295974 - 09/17/12 05:20 PM
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with default parameters this seems to give wrong colors.
See this shot:
Edited by eadmaster (09/17/12 05:24 PM)
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| R. Belmont |
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Cuckoo for IGAvania
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Reged: 09/21/03
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Posts: 9716
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Loc: ECV-197 The Orville
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Re: MAME and MESS wrong colors with yiq_enable 1
[Re: eadmaster]
#295983 - 09/17/12 09:06 PM
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> with default parameters this seems to give wrong colors.
> See this shot:
You need to play with yiq_cc and yiq_scan_time to get the picture you want if you wish to mess with YIQ mode. (YIQ = NTSC = intended for MESS drivers that normally display on TVs, not arcade machines with RGB monitors).
ETA: Setting yiq_o to 1.0 apparently gives correct colors, which should give a better baseline for playing with that mode.
Edited by R. Belmont (09/17/12 09:23 PM)
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Re: MAME and MESS wrong colors with yiq_enable 1
[Re: R. Belmont]
#295985 - 09/17/12 09:39 PM
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Setting yiq_o=1.0 finally fixed the colors, thank you very much! 
btw i guess older arcade machines also used NTSC TVs (correct me if i am wrong).
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| R. Belmont |
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Cuckoo for IGAvania
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Reged: 09/21/03
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Posts: 9716
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Loc: ECV-197 The Orville
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Send PM
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Re: MAME and MESS wrong colors with yiq_enable 1
[Re: eadmaster]
#295991 - 09/17/12 09:52 PM
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> Setting yiq_o=1.0 finally fixed the colors, thank you very much!
>
> btw i guess older arcade machines also used NTSC TVs (correct me if i am wrong).
Discrete-logic B&W games did and laserdisc games sometimes did, but in general nearly all games used analog RGB.
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Re: MAME and MESS wrong colors with yiq_enable 1
[Re: R. Belmont]
#295993 - 09/17/12 09:57 PM
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Ok, so i'll leave YIQ emulation off in mame.ini, and set it on in MESS.
Thanks again for your suggestions!
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Re: MAME and MESS wrong colors with yiq_enable 1
[Re: R. Belmont]
#295998 - 09/17/12 10:53 PM
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> Discrete-logic B&W games did and laserdisc games sometimes did, but in general nearly
> all games used analog RGB.
A B&W game won't be affected by NTSC color artifacting though. They used black and white tv's as they were cheaper and the game wouldn't output a color burst.
Even if a Laser disc game uses an RGB monitor, something has to convert from NTSC/PAL to RGB as that is the format of the signal on the disc. You'll just end up with an extra board that has the equivalent circuit to that found in a TV.
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