Monday, November 3, 2008

Resize Smaller?

I got a note asking about the magic numbers for resizing smaller, and thus improving the signal to noise ratio within an image. Here they are:
  • 71% (.707) halves the number of pixels
  • 50% gives you a quarter of the original pixels
Remember: use the Bilinear interpolation method so as to not introduce any sharpening at this stage.


Anonymous said...

Can you explain the math behind this? Is this the same for images of all bit depth?

While very useful, it seems counter intuitive so a little explanation could work wonders. Thanks.

Jim Hoerricks said...

Sure, I'll post it for today's post this afternoon.