I think it depends on the number of images:
up to 20-30 images there will not be any quantization and I'd use "Average" to obtain a 16 bit result.
For 50+ images I would use "Sum".
Search found 465 matches
- 16 May 2019, 14:35
- Forum: Image processing and analysis
- Topic: FITS file doubles in size after preprocessing
- Replies: 11
- Views: 5705
- 15 May 2019, 10:17
- Forum: Image processing and analysis
- Topic: FITS file doubles in size after preprocessing
- Replies: 11
- Views: 5705
Re: FITS file doubles in size after preprocessing
Hello, the stacked image has a range of one million ADU (because it's a Sum) so it's correctly saved as 32 bit. 16 bit FITS images are limited to approx. 0..65000 ADU. The ADU range of an image is always shown on the status bar of the image (R = ... ) You may keep the range to 16 bit using "Average"...
- 06 May 2019, 13:42
- Forum: General
- Topic: Astroart 7 Service Pack 1
- Replies: 5
- Views: 5438
Astroart 7 Service Pack 1
Hello everybody, the first service pack for Astroart 7 is ready. As usual it contains both new features and bug fixes. Version 7.0 SP1 - May 6, 2019 ----------------------------- * New feature. On calibrated images, marker for the sun direction. * New feature. Photometry with B-V range using the UCA...
- 24 Apr 2019, 09:20
- Forum: General
- Topic: IThumbnailProvider
- Replies: 3
- Views: 2485
Re: IThumbnailProvider
No, and I think they could not. The program should be quick and "invisible", often they are implemented as DLLs.
- 23 Apr 2019, 20:26
- Forum: General
- Topic: IThumbnailProvider
- Replies: 3
- Views: 2485
Re: IThumbnailProvider
It would be even better to write a small free program for that, just like we did with our FITS viewer: http://www.msbsoftware.it/avis/ . I will consider it in the future, thanks.
- 22 Apr 2019, 17:08
- Forum: Image processing and analysis
- Topic: Visualization
- Replies: 2
- Views: 1860
Re: Visualization
Yes, with SHIFT+F4 (or right click over the image then "View Range/..."). By the way a default visualization range can be obtained clicking on the Status Bar of the image, or pressing F4 (or F3 for a min-max visualization). On 8 bit images, press SHIFT+F3 for a 0..255 visulization (or Menu: "Visuali...
- 22 Apr 2019, 16:59
- Forum: Image processing and analysis
- Topic: Photometric Color Calibration
- Replies: 1
- Views: 1628
Re: Photometric Color Calibration
Hello, it's not possible.
As an alternative I can suggest the commands White Balance (both Algorithm and Bias) then Color Curves.
Fabio.
As an alternative I can suggest the commands White Balance (both Algorithm and Bias) then Color Curves.
Fabio.
- 17 Apr 2019, 23:17
- Forum: Image processing and analysis
- Topic: Astroart Processing and FITS headers
- Replies: 2
- Views: 1829
Re: Astroart Processing and FITS headers
What are the FIT headers AVISUMIN and AVISUMAX ? Hello, they are the visualization thresholds inside Astroart. They are used only when you reopen the image. When I finish preprocessing .fit files I get one set of values of AVISUMIN and AVISUMAX They were the visualization of a single raw image. Whe...
- 17 Apr 2019, 14:46
- Forum: Image processing and analysis
- Topic: Manual 2 star align?
- Replies: 10
- Views: 5079
Re: Manual 2 star align?
Hello, here are 4 reasons: 1) The dark frame must be corrected before debayering. 2) Debayering is a filter, and you may need to change the algorithm (the one used in your BMPs was not good, look at the shape of the stars). 3) In case of a discovery, you must have the original images. 4) Storing deb...
- 16 Apr 2019, 13:13
- Forum: Image processing and analysis
- Topic: Manual 2 star align?
- Replies: 10
- Views: 5079
Re: Manual 2 star align?
Hello, working with BMP has at least 3 problems: 1) The dynamic is only 8 bit, with FITS you would get 12/16 bits. 2) The dark frame cannot be corrected well. For example, in your sequence try to open an image, for example #14, then open a dark frame, then subtract the dark frame from the image and ...
- 16 Apr 2019, 00:10
- Forum: Image processing and analysis
- Topic: Manual 2 star align?
- Replies: 10
- Views: 5079
Re: Manual 2 star align?
Hello Krisztian,
I think that we can solve, but I don't understand: the files on your Google Drive are coloured BMP (?)
Don't you have the original FITS RAW files? Which software did you use to download them?
Greetings,
Fabio.
I think that we can solve, but I don't understand: the files on your Google Drive are coloured BMP (?)
Don't you have the original FITS RAW files? Which software did you use to download them?
Greetings,
Fabio.
- 13 Apr 2019, 00:52
- Forum: Image processing and analysis
- Topic: Manual 2 star align?
- Replies: 10
- Views: 5079
Re: Manual 2 star align?
Hello, yes, the "Two stars" method will work (increase the Radius to 100), but not perfectly, because the images also have a difference in scale . Maybe they were taken with a zoom lens which moved? cause the temperature? So, the correct alignment should be done with "Star pattern" but it's not poss...