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.

2 comments:

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.