Uploaded March 2023 | Updated September 2026, 3 weeks ago
Instructor: Dr. Christian Sasse, Astronomer-in-charge of iTelescope
Summary: This is Part 2 of the Mosaic Image Processing instructional video. If you haven’t yet viewed Part 1, we highly recommend you do that first. You can find it here: youtube.com/watch?v=MVuKQJeFpLA&t=6s
As part of this Part 2 tutorial, iTelescope has made available the 6 integrated Broadband (RGB) and Narrowband (HSO) images of the entire 7-hour exposure image set, which was made available in Part 1. You can download these integrated images here: dropbox.com/t/5AEuinB8T3IEDZFU. IF YOU POST THE IMAGE, PLEASE GIVE CREDIT TO iTelescope.
In this tutorial, Christian will demonstrate how to use Astro Pixel Processor (APP) to construct the 2x2 panels of the Large Magellanic Cloud (LMC) from the 6 integrated images.
Once the entire image is constructed in APP and exported as a TIFF file, Dr. Sasse will show you how to load it into Lightroom and use masks to fine-tune the final image to your liking. He also shows you how to use Viveza to adjust the final image.
YOU CAN USE THE CHAPTERS AS NOTES FOR FOLLOWING ALONG IN APP
iTelescope itelescope.net
Chapters
0:00 Introduction
3:15 Uncheck Muti-Session Processing and name the project
3:33 Load all light frames
4:22 Examining individual images
6:26 Open the Tool menu to combine an RBG image
7:00 Select the RGB1 formula to combine the RBG image
7:42 Enable saturation and adjust saturation slider and threshold sliders
8:22 Press recalculate on the right panel
9:01 Trying other RGB combination formula
10:05 Saving intermediate images.
10:50 Calibrating star colors, click on Calibrate star colors
11:13 Eliminating gradients, 1) pull saturation all the up, 2) place very small boxes in the background devoid of stars.
13:30 Recalculate background
17:25 Saving intermediate image
17:40 Where to select stars for star color calibration?
18:20 Explanation of how star color calibration works
19:17 Adjusting the scene stretch and saturation, try 10% stretch and take the saturation down to ~20
19:55 Saving intermediate image
20:21 Adding narrowband data, choose RGBHSO
21:20 Select None for Normalization
22:02 Add Narrowband channels and the last RBG-adjusted image
22:24 Explanation of the process
22:48 Select recalculate on the right panel after all the images load
23:25 Adjusting the HOS mixing. Add 25% green to the O channel, Remove all green, and add 100 red to the S channel
24:30 Recalculate to display new image
25:00 Explanation about experimentation
27:04 Saving intermediate images
28:09 Remove light pollution gradients, add very small boxes to the background of the image
30:20 Lower stretch to 10% and saturation to display a more pleasing image
30:50 Saving intermediate image
31:00 Explanation of final editing in Lightroom and
32:09 Exporting image as TIFF
34:37 Lightroom explanation
36:00 Adjusting the temperature, saturation, vibrance, and color grading
40:35 Using masks in LR
43:50 Exporting image from LR
45:10 Opening image in Viveza 3
48:50 Grouping masks in Viveza
50:35 Saving image in Viveza
52:30 Final Crop in LR
54:50 Wrap-up
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
Instructor: Dr. Christian Sasse, Astronomer-in-charge of iTelescope
Summary: This is Part 2 of the Mosaic Image Processing instructional video. If you haven’t yet viewed Part 1, we highly recommend you do that first. You can find it here: youtube.com/watch?v=MVuKQJeFpLA&t=6s
As part of this Part 2 tutorial, iTelescope has made available the 6 integrated Broadband (RGB) and Narrowband (HSO) images of the entire 7-hour exposure image set, which was made available in Part 1. You can download these integrated images here: dropbox.com/t/5AEuinB8T3IEDZFU. IF YOU POST THE IMAGE, PLEASE GIVE CREDIT TO iTelescope.
In this tutorial, Christian will demonstrate how to use Astro Pixel Processor (APP) to construct the 2x2 panels of the Large Magellanic Cloud (LMC) from the 6 integrated images.
Once the entire image is constructed in APP and exported as a TIFF file, Dr. Sasse will show you how to load it into Lightroom and use masks to fine-tune the final image to your liking. He also shows you how to use Viveza to adjust the final image.
YOU CAN USE THE CHAPTERS AS NOTES FOR FOLLOWING ALONG IN APP
iTelescope itelescope.net
Chapters
0:00 Introduction
3:15 Uncheck Muti-Session Processing and name the project
3:33 Load all light frames
4:22 Examining individual images
6:26 Open the Tool menu to combine an RBG image
7:00 Select the RGB1 formula to combine the RBG image
7:42 Enable saturation and adjust saturation slider and threshold sliders
8:22 Press recalculate on the right panel
9:01 Trying other RGB combination formula
10:05 Saving intermediate images.
10:50 Calibrating star colors, click on Calibrate star colors
11:13 Eliminating gradients, 1) pull saturation all the up, 2) place very small boxes in the background devoid of stars.
13:30 Recalculate background
17:25 Saving intermediate image
17:40 Where to select stars for star color calibration?
18:20 Explanation of how star color calibration works
19:17 Adjusting the scene stretch and saturation, try 10% stretch and take the saturation down to ~20
19:55 Saving intermediate image
20:21 Adding narrowband data, choose RGBHSO
21:20 Select None for Normalization
22:02 Add Narrowband channels and the last RBG-adjusted image
22:24 Explanation of the process
22:48 Select recalculate on the right panel after all the images load
23:25 Adjusting the HOS mixing. Add 25% green to the O channel, Remove all green, and add 100 red to the S channel
24:30 Recalculate to display new image
25:00 Explanation about experimentation
27:04 Saving intermediate images
28:09 Remove light pollution gradients, add very small boxes to the background of the image
30:20 Lower stretch to 10% and saturation to display a more pleasing image
30:50 Saving intermediate image
31:00 Explanation of final editing in Lightroom and
32:09 Exporting image as TIFF
34:37 Lightroom explanation
36:00 Adjusting the temperature, saturation, vibrance, and color grading
40:35 Using masks in LR
43:50 Exporting image from LR
45:10 Opening image in Viveza 3
48:50 Grouping masks in Viveza
50:35 Saving image in Viveza
52:30 Final Crop in LR
54:50 Wrap-up
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
