PanoTools mailing list archive
|Date/Time:||19-Oct-2010 05:10:02 +0000|
|Subject:||Re: What's a Gigapixel?|
On Oct 19, 2010, at 12:46 AM, Don Bain wrote:
> As an example, a true gigapixel equirectangular, with 25% cropped off both top and bottom, ends up with half a gig of pixels.
Although I am not up to calculating this at the moment, you would be cropping the most highly-stretched original pixels. I think this means your resolution is really higher than 50% of the original. Of course, how would you _really_ claim gigapixels in an equirectangular image, considering the distortions at the poles? In your example of about 45,000 pixels wide, you really have one (or a very limited number of) original pixels stretched all the way across the top and bottom rows of the equirectangular image, thus giving them credit for being 45,000 pixels, which they are not. Thus, I don't think you validly can do the old width pixels X height pixels for an equirectangular image. If you are doing a more traditional-style landscape with a VFOV that is not too large and the original pixels are hot heavily distorted, then W X H should be reasonable.
Or I may be full of crap. Not sure at this time of night.
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