Exposing PseudoAstronomy

August 16, 2012

Podcast Episode 48: Image Processing and Anomalies, Part 2

Alrighty, episode 48 has been posted, and the companion video has been expectedly delayed.

This episode is almost as long as part 1, and I still left stuff out. Sharpening and filters and stuff like that is going to wait for a later episode. The topics discussed this time are: Dynamic range, noise, rotation and resizing, and levels, curves, and contrast.

The bottom-line with this episode is that even the most seemingly innocuous adjustments – like Auto Levels, or rotate by 10°, or increase the size by 50% – are going to change the information that was originally there, and often it will do it destructively such that you cannot make the reverse change and get the original back.

There was a bit of feedback this time and a discussion of some write-ins for the puzzler last time.


August 8, 2012

Podcast Episode 47: Image Processing and Anomalies, Part 1

This episode is finally out. Well, “finally” as in “on time.”

I’ll admit that when I initially thought up this episode a few months ago, I was going to talk about how you can’t do spectroscopy from a still photo of an alleged alien (as some have claimed to have done with Billy Meier’s stuff).

But, given all the “goings ons” with the lunar ziggurat in the last week or two, this episode has turned into a Part 1 where this part discusses the very complicated but very basics of astronomy images and all the processing and calibrating that we go through to try to make it the truest representation of what we would really see. The main sections of the 41-minute-long main segment are: Black & White Astronomical Ground Photography, Different Spacecraft Camera Types, Releasing to the Community and to the Public, Color Processing, Quick Recap, Crazy Claims, How to Spot a Potential Fake or Forced Anomaly.

Part 2 should (yes, should, not “will”) include things like dynamic range, curves and levels, interpolation, filters, sharpening, etc. More to-the-point about some recent “goings ons” on the blog. Hopefully a companion video will come out.

Also in this episode was a New News segment, Q&A, and Puzzler. Given that it’s a 52-minute episode, I forewent Feedback.

Blog at WordPress.com.