Stacked image red star centres / saturation
Stacking program, astrometric (plate) solver, fits file viewer
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han59
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Hello - I'm using ASAP for the first time. I have just stacked an image of Orion constellation taken on a Fuji XT4 with Samyang 135 from 150 lights on 1 sec exposure on a tripod with no tracker and with corresponding darks and flats. I used the default settings and found the stacked image had some red saturation with the nebula quite saturated as if levels had been adjusted. Also the bigger stars (Orions belt) have red centres. I had previously used Starry Sky Stacker (MAC) and whilst I think the overall stacked image with ASTAP is superior the resulting image with SSS was darker without the red hue / saturation and the histogram over to the left. Astap histogram is more in the middle. Any advice? is there any pre-stacking settings or adjustments I should be looking at? I used ASTAP to convert my FUJI RAW files to FIT. Stacked image attached.
Actually - just as a follow up - I exported the image as a 16bit tiff and opened it in photoshop and it was black...I've stretched it out a bit and there's no saturation - what's going on here - ie does ASTAP apply a default stretch to the stacked image??
The was no attachment.
When exporting to TIFF you could stretch the saved image by selecting that. See attached.
Red star centers would be abnormal. Bu there is a setting to colour smooth and to balance the colours. See also attached.
Han