| From: | Xavier |
| Date: | 6 Sep 2001 at 09:38:05 |
| Subject: | Re: Better ADPro upscaling. |
On Thu, 6 Sep 2001 01:32:11 -0700, Xavier wrote:
> On Thu, 6 Sep 2001 10:19:09 +0200, Fritsch Alexander wrote:
> > Thanks to everybody who replied to my questions. You were a big help
> > for me. My ARexx-controlled WebCam runs nicely.
> > The ARexx-Script needs still some cleanup but I am happy with it so
> > far. I should have looked at ARexx long time before! OK, better late
> > then never ;)
>
> It still needs to utilize my scaling routine. The image has some nasty
> pixelization.
Bleh, I hate when I reply the wrong place. I might as well explain it for the
rest.
In ADPro, if you want to double the size of an image, quadruple it. Then use
the roll operator to shift the picture up and to the left 1 pixel, and scale
it down. Crop off the bottom and rightmost lines and you have a relatively
quickly interpolated image.
This I figured out after I slaved over two versions of another method which
peeked and poked into ADPro and did the interpolation in ARexx, which was
hideously slow (take a nap, go to the movies, make a huge dinner, die of old
age and check next time you're resurrected, etc).
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