How can I combine two masters of the same object (for example, a galaxy) obtained with two different telescopes? I have a master obtained with a C8 and another with a C9.25. I have done tests, but the two images do not appear joined correctly. Thank you!!
how to combine two masters obtained with different telescopes?
I just did what you are talking about. The image is not posted here on Astrobin yet, but it is on my website. Take a look.
The website just tells you the basics, not the process. Each setup, one for Lum subs only, and one setup for rgb's only. The lums were processed as any image and saved as a master Tiff, same for the rgb's. Both masters were then opened in Photoshop, more tweaking was done to each image. At this point I left the Lum alone, as it's my reference image, the rgb will be layered onto it. The rgb image had to be rotated and resized tell it matched the Lum image. this took a lot of trial and error tell I got them to match each other. Now I have a large rgb image sitting on a smaller lum image, the image was cropped so it is now the size of the smaller lum image. At this point I now have just one image and needs just one set of stars. Did a starX on both, got rid of the lum stars and used the stars from the rgb image, simple as that.
I should add, the rgb subs were of very poor quality due the not paying attention to the cooler that was not on, running two setups at once is a bit of work.
NGC225_2023 (mynightsky.net)
The website just tells you the basics, not the process. Each setup, one for Lum subs only, and one setup for rgb's only. The lums were processed as any image and saved as a master Tiff, same for the rgb's. Both masters were then opened in Photoshop, more tweaking was done to each image. At this point I left the Lum alone, as it's my reference image, the rgb will be layered onto it. The rgb image had to be rotated and resized tell it matched the Lum image. this took a lot of trial and error tell I got them to match each other. Now I have a large rgb image sitting on a smaller lum image, the image was cropped so it is now the size of the smaller lum image. At this point I now have just one image and needs just one set of stars. Did a starX on both, got rid of the lum stars and used the stars from the rgb image, simple as that.
I should add, the rgb subs were of very poor quality due the not paying attention to the cooler that was not on, running two setups at once is a bit of work.
NGC225_2023 (mynightsky.net)
Thank you very much, Bob!! I'll try it as soon as I can!
Well Written Respectful
I use Astro Pixel Processor for stacking and, using this program it is very easy to combine different focal lengths. You just need to set the reference frame to the master that you prefer and that is all. Then, if you need some blending on the image in some areas I think you can do that with the option “2nd degree LNC” within the Integrate tab, if I recall correctly.
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Hi, you can use the StarAligment PixInsight process. With this process you can match images with different focal lengths .
Thank you very much, Bob!! I'll try it as soon as I can!
I do want to note, I did the alignment of the two masters in PS just for something to do. I could have used CCDStack, my calibrating/stacking program,
and it would have done whatever need to be done. It rotates-flips-mirrors-unbins, whatever is needed to align all the stars. Indeed, if you can align your
masters from different setups, do so, this was just something to do and see what would come of it.
A very good solution is using Astro Pixel Processor as mentioned above. It has the option during registration to 'Use same camera & optics' and this should be unchecked. This will register them knowing it was not from the same session or camera/optics. This is in Step 4 of APP.
You will also want to check the 'flip descriptors in X/Y'. This will tell it that some images may be either flipped or rotated or in different orientations from different optics. This is in Step 4 of App.
I also enable 'Use Dynamic Distortion Correction' here as well since it could be differences and seems to handle it better. This is in Step 4 of App.
Lastly, you can also enable multi-banded blending toward the integration phase and this will do a really good job blending any harsh edges either from mosaics or from images from different setups. Usually a good 10-15% will do here, on mosaics it just depends on the overlap, but different masters could be left lower. You might also do LNC 1st degree with 3 iterations. It usually does a nice job. These are on Step 6 integration panel.
You will also want to check the 'flip descriptors in X/Y'. This will tell it that some images may be either flipped or rotated or in different orientations from different optics. This is in Step 4 of App.
I also enable 'Use Dynamic Distortion Correction' here as well since it could be differences and seems to handle it better. This is in Step 4 of App.
Lastly, you can also enable multi-banded blending toward the integration phase and this will do a really good job blending any harsh edges either from mosaics or from images from different setups. Usually a good 10-15% will do here, on mosaics it just depends on the overlap, but different masters could be left lower. You might also do LNC 1st degree with 3 iterations. It usually does a nice job. These are on Step 6 integration panel.
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