Problem with resizers

AlPa · 3rd August 2012, 16:28

Hi!
I'm trying to apply resizers from avisynth in my program, which should generate mipmaps, but I have a problem: I tried all the 11 internal resizers, and some external plugins, but all of them accept output width and height only up to 8 pixels or so. Does any plugin exist which can resize up to 1x1?

IanB · 3rd August 2012, 23:43

A resize to 1x1 would be an average of the whole image.

BilinearResize() can resize to 2x2 for RGB, Y8 and YV24 images.

You could then do a last step of combining the 4 pixels with flips and merge, then crop a single pixel.

Code:

...
BilinearResize(2, 2)
Merge(FlipVertical()) # Average top and bottom
Merge(FlipHorizontal()) # Average left and right
Crop(0,0,1,1) # Grab top left pixel

jmac698 · 4th August 2012, 19:59

I had the same problem trying to extract small regions in my scripts. I usually just resize everything bigger, do a scaled resizing, and then do a final resize externally.

3rd August 2012, 16:28	#1 \| Link
AlPa Registered User Join Date: Jul 2012 Posts: 1	Problem with resizers Hi! I'm trying to apply resizers from avisynth in my program, which should generate mipmaps, but I have a problem: I tried all the 11 internal resizers, and some external plugins, but all of them accept output width and height only up to 8 pixels or so. Does any plugin exist which can resize up to 1x1?

3rd August 2012, 23:43	#2 \| Link
IanB Avisynth Developer Join Date: Jan 2003 Location: Melbourne, Australia Posts: 3,167	A resize to 1x1 would be an average of the whole image. BilinearResize() can resize to 2x2 for RGB, Y8 and YV24 images. You could then do a last step of combining the 4 pixels with flips and merge, then crop a single pixel. Code: ... BilinearResize(2, 2) Merge(FlipVertical()) # Average top and bottom Merge(FlipHorizontal()) # Average left and right Crop(0,0,1,1) # Grab top left pixel

4th August 2012, 19:59	#3 \| Link
jmac698 Registered User Join Date: Jan 2006 Posts: 1,867	I had the same problem trying to extract small regions in my scripts. I usually just resize everything bigger, do a scaled resizing, and then do a final resize externally.