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)
This spectrum needs to be calibrated. Learn how »
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Operations enable reversible modification of data -- they act like filters which process the data. The graph you see above represents the data after these operations have been run. Delete them to undo their effects, or to apply them in a new order.
#000-style suffix, like subtract:3243#2414 are referring to a specific snapshot (in this example, #2414) of another spectrum. Click to learn more.These spectra are being temporarily displayed for comparison; Clear all
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| Noise reduction test | warren | 2 |
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spectrum.addAndParseTag('smooth:10'); // Smooth the spectrum
// spectrum.addAndUploadTag('smooth:10'); // <== to save
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Let's calibrate and compare to the un-blurred one!
I think i can write a "vertical average" macro today or tomorrow.
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.
Take a look though -- there is some: http://spectralworkbench.org/sets/show?id=172