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How to measure sharpness in your images
It is hard, sometimes, to discern if your images are really as sharp as they might be. While your eyes are great to spot the difference between a blob and a sharp star, it is preferable to have some real data to actually analyze.
Stellar Sharpness Measurement ( One image )
As soon as you download an image from your camera, you can very easily see if your seeing and/or focus are up to par. Just right click on your images and choose Stellar Sharpness Calculations then the size of the zone to be measured. If you choose 512x512 for a fast turnaround. If not, the entire image will be used.
Here is how you measure a single image
Measure Multiple Images
Another great tool in PRISM is the "Quality Check (Stellar Images)" under the analysis menu. This tool allows to analysis a whole set of images ( same size and pixel type that is ) in order to understand how the imaging session evolved of the course of a night for example. Here is a quick rundown.
1. Load the tool, check an area of 1/8(for faster analysis) the frame and press OK
2.The output is as follows:
Mean sky background
Median sky background
Elongation of the stars
And finally, the actual output of the tool with all the data