On Thursday 10 February 2005 22:35, Martin Samuelsson wrote: > On Thursday 10 February 2005 03:19, Richard Ellis wrote: > > On Wed, Feb 09, 2005 at 10:32:17PM +0000, John Gay wrote: > > > Yes, but the POV-Ray team already have their hands full creating more > > > interesting rendering effects than adding support for several > > > non-square pixels that would only confuse everyone except us video > > > making guys. > > > > You do make a valid point, and I'll concede that they very well may > > be by far more interested in more effects than supporting non-square > > pixel sizes. But you'd never know unless you asked, and the fact > > that they support interlaced frames (which technically are > > unnecessary for computer generated, computer displayed, and printed > > images) makes me think they might be slightly amenable to the idea. > > And, lo and behold; a quick search for "aspect" in the POV-Ray docs turn up > > the camera parameters top and right: > > 2.3.1.1.6 Aspect Ratio > > Together the up and right vectors define the aspect ratio (height to > > width ratio) of the resulting image. The default values up<0,1,0> and > > right<1.33,0,0> result in an aspect ratio of 4 to 3. This is the aspect > > ratio of a typical computer monitor. If you wanted a tall skinny image > > or a short wide panoramic image or a perfectly square image you > > should adjust the up and right vectors to the appropriate proportions. > That covers the aspect ratio of the image, not the pixels. POV-Ray, as with most computer graphic programs produce images with square pixels, whereas TV use non-square pixels. for PAL standard, the screen is 720 X 576 pixels, for both wide screen (16:9) or normal (4:3), the pixels are non-square to suit. When I create images for wide-screen use, I set the image to 1024 X 576. Therefore when generating images on computer, which generates square pixels, the image needs the pixels scaled to suit the TV display setup.
> You might want to hold that mail until you've looked through > http://www.povray.org/documentation/view/3.6.1/246/ > But as I said, most video creation software deals with the same problem and includes tools to adjust the pixel aspect ratio, so I doubt the POV-Ray team would be interested in providing yet another 'wheel' to do the same thing. Cheers, John Gay ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
