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Uploaded on March 03, 2013 15:08 UTC

A 50 pixel horizontal slice of the Snowy Sky spectrogram averaged by applying a vertical motion blur filter in Photoshop. I assume the remaining corduroy effect is an artifact of the grating rulings. I cut out a 50 pixel tall horizontal slice of the Snowy Sky spectrogram and applied a Photoshop filter: Filter/Blur/Motion blur/angle=90/distance=50 pixels. Calibrated with $W.calibrate(4476,139,430.8,1449,656.3)


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Noise reduction test warren 2
over 9 years ago, warren wrote:

Let's calibrate and compare to the un-blurred one!

over 9 years ago, warren wrote:

I think i can write a "vertical average" macro today or tomorrow.

over 9 years ago, cfastie wrote:

I'm not sure calibrating changes much here. A macro should allow selection of a horizontal slice through the image so messy areas can be avoided. It will important to have images which are not angled, e.g., emission or absorption lines must be vertical. For images taken with DVD gratings you might have to select a narrow slice through the vertical part of the curve.

over 9 years ago, warren wrote:

Take a look though -- there is some:

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