Unsharp masking
This protocol is extracted from research article:
The birth of a coronal mass ejection
Sci Adv, Mar 6, 2019; DOI: 10.1126/sciadv.aau7004

We applied unsharp masking to SDO/AIA 131-Å images to highlight fine structures like plasmoids. First, one generates a pseudo-background by smoothing the original image with a box car and then obtains the unsharp masked image, the residual by subtracting the background from the original, or the enhanced image by adding the original back to the residual. We adopted a smoothing window of 5 × 5 pixels (3″ × 3″) for the early stage evolution (15:30 to 15:50 UT) and 7 × 7 pixels later on for optimal visualization.

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