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.

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2 comments:

  1. AnonymousNovember 4, 2008 at 8:58 AM

    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.

    ReplyDelete
  2. Jaime Hoerricks, PhDNovember 4, 2008 at 4:30 PM

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

    ReplyDelete