hi , I wanted to know what makes what supposed to be colored spots dottd spots , for example a gray area becomes full of checkered pattern (squares like) kindly look at those photos of same spot on composite vs rgb scart.. the setup I tried was: sega cd 1 + modded multi region europe mega drive 1 with sega key & and with loaded bios via catridge sega cd 1 + genesis 1 ntsc uc , with sega key as some of those copied games are pal i noticed that those effects reduced a bit when used the european console thnx
That looks normal and is why rgb isn’t always better. Old crt TVs running composite or rf are rather imprecise. Programmers would use a technique called dithering to make more colors than the hardware would normally allow, the natural blurryness of composite blends the colors together. Rgb removes the effect.
thanks for your reply, well what you said is what I had on mind that rgb scart is just canceling the blueness which supposed to blend these checkered boxes, however it looks too odd to me, mainly that it spoils mainly the movie of FMV games, what I will do is I will try the mega cd 2 I have and compare just to clear this from mind
My experience is that dithering was used far more in fmvs to compensate for the limitations of the hardware the same way that many games also used black borders. The Sega cd provided a great storage medium but with very heavy restrictions.
obviously you are right, sega cd 2 looks the same , i will just make do with whats available and always see if i can use composite or scart depending on the game thnx alot
It may also be due to 'checkerboard' effect caused by using a cable with sync on Composite. Are u using a quality RGB cable wired for CSYNC?
I think its a relatively good quality from this site http://www.consolegoods.co.uk/, however not sure if it is a csync or not, how to check that ??
It's perfectly fine in both pictures. An obvious example of using Composite to create more shades. Scart RGB has like 5 times the bandwidth, so the effect fails and you get the sharp pixels that RGB is famous for. Turns out it's not always perfect
It's probably using sync over Composite video. Check continuity using a DMM between pin 20 on the SCART and pin 1 (CSYNC) or pin 2 (Composite video) of the 8 pin din connector. https://gamesx.com/avpinouts/genesisav.htm So you don't think it's a case of checker boarding?
Looks like a sync over Composite cable. Picture quality is still good but if you want the best picture, you will want a CSYNC RGB cable from somewhere like https://www.retrogamingcables.co.uk/ or https://retro-access.com/ It won't help with the dithering though.
