Author Topic: Help regarding scanline emulation  (Read 1027 times)

0 Members and 1 Guest are viewing this topic.

Offline mr_lou

  • 6128 Plus
  • ******
  • Posts: 3.025
  • Country: dk
    • index.php?action=treasury
    • 8-bit Memoirs - a Blu-ray diskmag-like eBook about the 8-bit era
  • Liked: 1191
  • Likes Given: 2417
Help regarding scanline emulation
« on: 10:45, 28 January 16 »
Ohoy

So, I'm about to start recording a lot of videos from my Amstrad CPC.
For this I've bought the XRGB-Mini Framemeister, which offers scanline emulation.

It can take a 240p image and scale it up to 720p. In this process it takes every line and displays twice followed by the same line again dimmed a bit.

It is this dimming I'm asking for help with. I can set how much it's supposed to be dimmed. The standard settings looks good, but I don't feel it's entirely accurate.
Thought I better ask here.

I can set a value between 0 and 100, where 0 is completely blank and 100 is not dimmed at all.

What do you emulator creators usually use?


P.S.: Yes, I know the CPC doesn't output a 240p signal. I'm trimming the edges to get a 240p image.

Offline Executioner

  • Supporter
  • 6128 Plus
  • *
  • Posts: 783
  • Country: au
  • WinAPE Developer
    • WinAPE
  • Liked: 391
  • Likes Given: 60
Re: Help regarding scanline emulation
« Reply #1 on: 04:33, 14 February 16 »
What do you emulator creators usually use?

WinAPE uses 50% RGB values in the alternate scan lines, but also blurs the pixels horizontally by using a running average on the RGB.

Offline arnoldemu

  • Supporter
  • 6128 Plus
  • *
  • Posts: 5.335
  • Country: gb
    • Unofficial Amstrad WWW Resource
  • Liked: 2262
  • Likes Given: 3478
Re: Help regarding scanline emulation
« Reply #2 on: 12:55, 14 February 16 »

What do you emulator creators usually use?
I do the really bad emulation. ;)

I put a black line every odd line and I'll be doing the same for the next release because I'm concentrating on crtc emulation now. (ok I took a detour to emulate the symbiface 2 roms and ram).

I do perform gamma correction, brightness and contrast though - or at least I try.

I'll change it after I've sorted most of the crtc emulation.


My games. My Games
My website with coding examples: Unofficial Amstrad WWW Resource