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19 June 2021: Our upload server has been migrated successfully to our new office with higher upload and download speeds (nearly 10MByte/sec up/down ) ! We now have 1 general upload user called: upload with password: upload. The users upload1 - upload5 have been disabled.

31 May 2021: APP 1.083-beta2 has been released ! APP 1.083 stable will follow soon afterwards. It includes a completely new Star Reducer Tool, New File Saver Module, Improved Comet registration and much more, check the release notes here!

DOWNLOADS are available HERE!


[Sticky] Astro Pixel Processor 1.083 - preparing next release...  


Universe Admin
Joined: 4 years ago
Posts: 2715
July 30, 2020 21:49  

Astro Pixel Processor 1.083 beta 2 - will be released before June 1st 2021 !

  • NEW STAR REDUCER TOOL, APP will now have a tool that will help you to quickly reduce or remove the bright stars in your images. The purpose of this is to have other features in your images to stand out more, like a bright and beautiful nebula or a galaxy. By reducing the stars, the nebula details will become more clear. The tool enables you to reduce the star size, manipulate the overall star brightness and you will be able to switch quickly between the reduced version and the original of your data. To be clear, this tool is not based on, nor using Starnet++. It's 100% our code and implementation. Some examples:
StarReduced IC1396a SHO
Crop Reduced IC1396a
Crop Original IC1396a
Crop Reduced Rosette Halpha
Crop Original Rosette Halpha
  • IMPROVED COMET REGISTRATION/ALIGNMENT, the comet registration has been improved over the module from beta1. In 1.083beta1, the alignment could suffer on comet nuclei that were saturated so it was a bit difficult to find a sub-pixel comet position. In beta2 we have fixed this by considering the whole intensity profile of the comet nucleus and comparing this to other frames. A comet is an extended object, not a point-source like a star, so fitting to a Gauss profile or using Center Of Mass method will not work to get subpixel precision, so we found another way to still do this we think. In addition, we are now using the time shot metadata to further refine the comet movement between frames, so the final registration parameters will be very precise, like 0.1-0.3 pixel precision should be expected for alignment of the comet nucleus, which in turn should make the fainter details of the comet (like in the tail if present) be more sharp in the final integration. Finally, the new method of alignment for the comet, could be used to align images with very little stars as well, so you can use it as a one-star alignment if needed.
Improved Comet Alignment 2
Improved Comet Alignment
  • NEW FILE SAVER MODULE INCLUDING PNG WRITE SUPPORT, DPI AND ADDITIONAL ICC COLOR PROFILES, file saving in APP has been completely upgraded. This upgrade is applied in the whole application where frames are saved and it should solve many requests regarding file saving in the application. It is used when masters are created, your light frame integration/stack, when you save with the preview filter and in all the batch tools. Especially in the batch tools, the file saver is new much more user friendly. You only need to set the save settings once for whatever file type that you choose and the batch will be saved in the same way, without ever asking file save settings again. The file saver now is just one panel that allows you to set all file save options which are, directory of choice (no more saving in only the Working Directory), file name of choice, file type (FITS/TIFF/PNG/JPG), bit depth (depending on the file type, 8/16/32 bits), ICC profile for TIFF/PNG/JPG, JPEG quality. The new file saver also includes the option to set Dots Per Inch (DPI, for printing purposes) for TIFF/PNG/JPG frames. Finally, the file saver includes many more ICC color profiles (no profile for linear data, sRGB v2, v4, ColorMatch RGB, Adobe RGB 1998, Apple RGB, Wide-gamut RGB, ProPhoto RGB) to use which can be needed for printing purposes, or for moving the non-linear data to other applications like Photoshop. Be aware that if your data is still linear, simply save your data without an ICC color profile. So you can also choose to not include an ICC color profile for TIFF/PNG/JPG when the data is still linear. (if you do save with an ICC profile on dark linear data, you will get issues with your data! ICC color profiles like sRGB, Adobe1988, ProPhoto etc... are not to be applied on linear data at all, they are for the non-linear color spaces).
File Save Panel
  • FIXED, USER INTERFACE GLITCHES ON WINDOWS SYSTEMS, as reported in several forum topics, some Windows users, especially with newer hardware, have reported crashes/glitches of the APP Graphical User Interface. One of these topics is: . We have fixed the problem by including the fix in the application installer to disable both Direct3D & OpenGL for the native Java JDK components. The solution was proposed by @bcolyn and it does seem to solve the issue completely we are happy to say.
  • ADDED READ/WRITE SUPPORT FOR PNG FILES, you can now load and save PNG files including saving with DPI (Dots per Inch) and choice of ICC color profiles.
  • FIXED, FITS READER, APP's fits reader will now read FITS frames that hold multiple FITS HDUs where only the first HDU is the actual image data. This applies to professional astronomy data like from the Hubble Archive...
  • WORK-AROUND IN FITS READER, FOR APPLICATIONS THAT USE A FAULTY FITS WRITER: some users reported problems with some FITS files where APP could not read these, but other applications could. The topic is : Some of the problem FITS files come from the Voyager capture software developed by Leonardo Orazi. Together with Leonardo, we have found the root cause of the problem. It turned out that the FITS writer code that is used in Voyager is a badly ported version of the nasa java fits library that we use in Astro Pixel Processor. The ported version is not following the FITS specification for how the FITS Header bytes should be filled with byte values once all metadata has been stored. So the root cause is not in APP, the root cause of the problem is in the capture software or the ascom driver that such a capture package uses. Leonardo has fixed this issue in Voyager and in APP, I have implemented a work-around so that this particular FITS issue is detected and the files are still read properly.
  • IMPROVED, WORKFLOW in 3) ANALYSE STARS, 4) REGISTER, 5) NORMALIZE : you can now directly skip tabs 3), 4) en 5). This is usefull in the following cases:
    • Comet registration, by skipping 3) star analysis, you can directly perform comet registration using only the comet nucleus. You can also perform 1 star registration in this way, if you have data with very little stars. If you do have stars in your data, we recommend to perform star analysis, since APP will then perform comet registration after star registration, and this should and will give you better results in terms of precision.
    • Proceeding with already registered frames, skip 3) and 4) and proceed directly with normalization.
    • Proceeding with already registered and normalized frames, skip 3), 4) and 5) and proceed directly with integration.
    • Proceeding with alread normalized frames, perform star analysis and registration and then skip normalization to directly go to integration.
disable star analysis
disable registration
disable normalization
  • FIXED, CALIBRATED PROJECTIVE REGISTRATION, the calibrated projective registration mode did not work in 1.083 beta 1. This has been fixed. The bug caused a null pointer exception when registration was finished because the camera matrices were not produced which was caused by APP failing to ask the focal length and pixel size of the reference frame.
  • IMPROVED, ANALYSE STARS, the star detection algorithm has been improved once again because we received some data where it failed. This concerned data of long narrowband exposures where a lot of cosmic rays were present in high numbers... which confused APP. It thought that the cosmic rays were stars... We have made sure that the new algorithm works properly on all of our test data. In addition some optimizations were applied as well, so module 3) Analyse stars is now 10-20% faster 🙂 Please check this example were APP 1.082 failed and 1.083 works, a 30 minute H-alpha exposure with many cosmic rays.
H alpha 30 minutes Exposure Cosmic Rays
H alpha 30 minutes Exposure Cosmic Rays Star Detection
  • BATCH MODIFY TOOL HAS BEEN REPLACED BY 4 SEPARATE BATCH TOOLS, we have replaced it finally because it was a multi-function complicated user unfriendly tool. The different functionalities have now been made possible with the introduction of 4 new Batch tools: Batch Crop, Batch modify metadata/CFA, Batch add/multiply, Batch save which will be introduced below:
  • NEW BATCH MODIFY FITS METADATA/CFA TOOL, the Batch Modify FITS METADATA/CFA tool allows you to save copies of your frames with corrected metadata for
    • iso/gain
    • exposure
    • instrument (your camera name)
    • filter used
    • capture session
    • add Bayer/X-Trans CFA tag
    • remove Bayer/X-Trans CFA tag / undemosaic already demosaiced data

The following screenshots show an example where you can add the correct CFA tag for data that is missing the tag because the capture software did not include it...

Batch Modify Header add CFA
Batch Modify Header remove CFA undemosaic
Batch Modify Header removed CFA
  •  NEW BATCH CROP TOOL, the Batch Crop tool enables you to make a crop of your data. You can draw the crop/rectangle and/or use crop offsets to finetune the desired crop. The crop dimensions and aspect ratio are shown as well.
  •  NEW BATCH ADD/MULTIPLY TOOL, the Batch Add/Multiply Tool enables you to add/subtract and multiply/divide the data in your images with a certain offset or factor.
  • NEW BATCH SAVE TOOL, the batch tool enables you to save a batch of files to a different filetype and possibly change the bitdepth of the data as well.
  • IMPROVED BATCH ROTATE/RESIZE TOOL, we have updated the user interface of the tool and it now provides a quick preview when you touch the rotate, resize sliders or touch the flip selectboxes.
  • IMPROVED BATCH TOOL FILE SELECTOR, you can choose whether to show only the file name or the complete file path of the files to be loaded into the batch tools. This will also apply if you want de delete multiple frames from the file list with the right mouse-click popup menu.
  • FIXED, ADVANCED NORMALIZATION, a regression bug has been fixed that caused advanced normalization not to start in some cases.
  • FIXED, BAYER DRIZZLE WITH THE HA-OIII debayer algorithms, enabling bayer drizzle with the Ha-OIII extract Ha or extract OIII algorithms did not work correctly. It showed the exact same result which was similar to the Ha-OIII mono debayer algorithm. It now works correctly as is show in the next screenshots:

Bayer Drizzle with Ha-OIII mono (so mix of the Ha and OIII signals):

BayerDrizzle HaO3 mono

Bayer Drizzle with Ha-OIII extract Ha (only Ha):

BayerDrizzle HaO3 extractHa

Bayer Drizzle with Ha-OIII extract OIII (only OIII):

BayerDrizzle HaO3 extractO3

A HOO composite of these Ha and O3 signals made with the RGB Combine and Selective Color tools (data courtesy of Ian Barredo @tracer, asi533 Optolong L-Extreme filter):

HOO custom cbg SC St

Astro Pixel Processor 1.083 beta 1 - 30 July 2020:

ADDED COMET REGISTRATION: Astro Pixel Processor 1.083 stable will have full comet procession support, this first beta release introduces registration/alignment on the comet nucleus.

To perform comet registration, go to 4) Register, and set the registration mode to...: comet  🙂

You will need to select the comet in the first image, then on the other light frames, APP will try to auto-detect the comet nucleus. If it fails the auto-detection, due to

  • a big change of the comet brightness or
  • a big move of the comet between 2 successive image

then you will simply be asked to select the comet again in that image.

I have tested it on a wide range of datasets of different comets as well, and so far all is working nicely with very precise results. Thank you all for uploading all your comet datasets, we received many datasets which really helped in getting this working robustly on a wide variety of datasets.

Here are the download links for the 1st beta release:

 We have created a special subforum for all your questions and feedback related to comet processing in APP and in general:

This video tutorial demonstrates the new comet registration functionality introduced in Astro Pixel Processor 1.083-beta1.

Please share your results, questions and any problems that you may encounter.



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