16:9 correction option

[Former user]

Original [issue 24](https://code.google.com/p/genplus-gx/issues/detail?id=24) created by simonharrison.uk on 2009-03-04T12:37:34.000Z:

It would be nice if genplus would have the 16:9 correction as the NES and SNES emulators for the Wii do. I find that on my 40" LCD the 4:3 aspect ratio is far better.

[Former user]

Comment # 1 originally posted by simonharrison.uk on 2009-03-04T12:42:13.000Z:

I also have the same request for Hugo GX and SMS plus. Shall I add to their issue pages? Cheers

[Former user]

Comment # 2 originally posted by ekeeke31 on 2009-03-06T10:25:21.000Z:

in Video options, by setting the Aspect to MANUAL, you can adjust the horizontal and vertical scaling. SNES and NES emulators do the same thing but apply some automatic values (using -90 should reproduce a 4:3 aspect ratio on your 16:9 scrreen)

you can also make your TV switch to 4:3 manually, the result should be slightly better than stretching the image on the emulator side

what happen is that when the TV is setup in 16:9 , it will STRETCH any video signal output from the Wii by a 4:3 ratio to fit the screen. Emulators generally render the screen at the same size of the original, which had 4:3 aspect ratio (4:3 x 4:3 = 16:9).

To "compensate" this, what is done (on SNES/NES emulator with 16:9 correction... or with the option changes I told you in genesis plus) is to SHRINK the original image width by a 4:3 ratio FIRST so that it will appear normally on a 16:9 screen AFTER it has been stretched by the TV

so in fact, by doing this, the image is altered (shrinked then stretched) and the output result can be very bad (depends on TV and filtering used)

That's why it's always better not to do ANY correction and configure the TV in 4:3 mode (this should be possible on every kind of TV, check your installation guide) so that no stretching occurs.

[Former user]

Comment # 3 originally posted by simonharrison.uk on 2009-03-06T15:09:18.000Z:

Thanks for the detailed explanation, ekeeke31. I'm now happily using the 4:3 option on the TV.

[Former user]

Comment # 4 originally posted by ekeeke31 on 2009-03-06T15:30:14.000Z:

[Former user]

Comment # 5 originally posted by ekeeke31 on 2009-09-15T14:23:28.000Z:

This has been added as an option when selecting the Video Aspect: ORIGINAL (16:9). This automatically set the scaling settings to keep the corrcet aspect ratio even on 16:9 screen.