Same picture, two processing methods (AstroEspi)

Contains: Solar system body or event

Same picture, two processing methods

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Same picture, two processing methods

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Thse Sun pictures were taken on December 28, 2022, with quite good seeing and general conditions.

The underlying image is the same monochrome picture, taken with a Lunt 40 single stack and a ZWO ASI290MM mini camera, mounted on a AZ-EQ5 mount, using SharpCap as capture tool. However the way to process the picture has been slightly different, mainly regarding the deconvolution step, which turns out to be critical in this kind of pictures.

The FOV of the camera doesn´t allow to capture the full circle, so a mosaic has been created from north and south part of the Sun shot and stacked separately. ImPPG has a good registration tool to do this, after that the GradientMergeMosaic from PixInsight did the job, with very good results in terms of global luminance.

For the stacking part, Registax 6 has been used, taking best 25% from a 1000 frames video, gain 40 and 1,8 ms exposure.

As for the deconvolution step, the image on the left has been processed using ImPPG with Lucy-Richardson deconvolution parameters set to 1,0 (Sigma) and 50 (Iterations), and Unsharp masking parameters set to 0,5 (Sigma) and 7,0 (Amount). On the other hand, the deconvolution step for the image on the right has been done in Registax 6, enabling the Dyadic, Gaussian check boxes in the Wavelets tab, with a value of 0,20 for Denoise, 0,100 for Sharpen and 100 for Preview for the first layer only (rest of layers set to default values).

Regarding the tones curves, both images have been inverted, but the one in ImPPG has been tuned to darken a bit the border of the Sun.

The final step in PixInsight has been to add colour and a bit of contrast.

Hope this helps to those initiating in solar imaging, such as myself!

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Same picture, two processing methods

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