Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: Compression at horizontal screen edges  (Read 1299 times)

0 Members and 1 Guest are viewing this topic.

jimmy2x2x

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1220
  • Last login:December 19, 2018, 01:29:48 am
Compression at horizontal screen edges
« on: February 29, 2012, 07:38:00 pm »
I have compression at both left and right screen edges

Im sure I have seen some guidance on fixing this somewhere, can't seem to find it

RetroACTIVE

  • Trade Count: (+7)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1418
  • Last login:Today at 09:27:43 am
  • Gramps
Re: Compression at horizontal screen edges
« Reply #1 on: March 01, 2012, 05:15:39 pm »
I'm not sure what kind of monitor you have but I experience this on mine to a slight degree, especially on the right side.  In my instance it's a linearity problem that usually (if its a digital monitor) can be corrected by the OSD menu... unfortunately my monitor has the adjustment but doesn't actually do anything.  Also its also more of a problem at lower resolutions... higher resolutions don't have this linearity issue on my monitor.

For me its something I live with because there is nothing that can be done.

Not much help but I thought it might be useful info.
Happy Gaming!

Calamity

  • Moderator
  • Trade Count: (0)
  • Full Member
  • *****
  • Online Online
  • Posts: 6543
  • Last login:Today at 06:45:32 pm
Re: Compression at horizontal screen edges
« Reply #2 on: March 01, 2012, 05:47:18 pm »
I think this is the post you saw:

http://forum.arcadecontrols.com/index.php?topic=112869.msg1202634#msg1202634

But I'm afraid it couldn't get fixed by software.
Important note: posts reporting GM issues without a log will be IGNORED.
Steps to create a log:
 - From command line, run: groovymame.exe -v romname >romname.txt
 - Attach resulting romname.txt file to your post, instead or pasting it.

CRT Emudriver, VMMaker & Arcade OSD downloads, documentation and discussion:  Eiusdemmodi

Paradroid

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 656
  • Last login:Today at 02:54:36 pm
    • SCART Hunter
Re: Compression at horizontal screen edges
« Reply #3 on: March 02, 2012, 06:12:47 am »
Yep, I've seen this effect before too. Is it severe (like in the post Calamity linked to) or is it fairly subtle? When it's only subtle and only at the very edges of the screen I've found that most of the effect can be masked by having a very slight overscan.
My MAME/SCART/CRT blog: SCART Hunter

jimmy2x2x

  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1220
  • Last login:December 19, 2018, 01:29:48 am
Re: Compression at horizontal screen edges
« Reply #4 on: March 02, 2012, 03:56:42 pm »
Its not terrible, but I have started to notice it ALL THE TIME now, gives me a slightly drunk sensation!

a little overscan does help, cant find anything in the adjustments to help it

I guess I will live with it for now and keep my eyes peeled for another monitor

Paradroid

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 656
  • Last login:Today at 02:54:36 pm
    • SCART Hunter
Re: Compression at horizontal screen edges
« Reply #5 on: March 02, 2012, 06:36:41 pm »
Its not terrible, but I have started to notice it ALL THE TIME now, gives me a slightly drunk sensation!

Oh no, that's how the sickness starts... ;) You're playing a really fun game and all you can think is "the bottom left corner flickers more than the rest of the screen" or something similar.

I never thought much about H and V linearity until I noticed something odd while playing Shinobi. I think it's the 2nd or 3rd stage (not a hardcore Shinobi fan so I don't know from memory) that has a grid or cross hatched pattern in the background. As it scrolled I noticed that the squares got smaller and bigger depending where they were on the screen. It's also easy to spot vertical linearity problems when you boot up Street Fighter 2 (when the high rise building scrolls down the screen).

I don't know if you can ever get linearity technically perfect but there's definitely a sliding scale between "best" and "worse".
My MAME/SCART/CRT blog: SCART Hunter