[cc65] Re: TGI pixel aspect ratio

> Message-ID: <200910282133.26725.groepaz@gmx.net>
 
Groepaz wrote:
> On Mittwoch 28 Oktober 2009, Mark J. Reed wrote:
> > We're talking about the *pixel* aspect ratio, which is independent of
> > the resolution.  On a standard TV or monitor, the pixels on a C-64 are
> > taller than they are wide.  On a VIC-20, they're wider than they are
> > tall.  Code that assumes square pixels will produce distorted images.
> 
> yeah indeed. resolution isnt the problem anyway, the app already gets all
info
> about it and can do whatever it needs to do to support it. pixel aspect
ratio
> would be a totally different thing :)
 
It all depends on how exactly your display device is adjusted. If
you take the standard 4x3 display and put 640x256 pixels in it you
effectively have pixels sizes of 160:85.33333, significantly under
2:1 (comes out at 1.875:1).
 
However, placing a ruler on my monitor shows 640 horizontal pixels
displayed in 230mm and 256 vertical pixels in 184mm, giving pixels
sizes of (230/640):(184/256) = 0.35:0.71 = 1:2 - but's that's
because I've adjusted my monitor to ensure square pixels.
 
-- 
J.G.Harston - jgh@arcade.demon.co.uk - mdfs.net/User/JGH
In 1939 $50 of groceries would fill three station wagons. Today I
can lift $50 of groceries with one hand. I must have got stronger.
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