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Messages - msmythers

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1126
General / Load Process Icon at start
« on: 2014 October 22 22:09:42 »
Is it possible to load a process icon or icons automatically when you start PixInsight? I am currently using Windows but would like to know about the other platforms also.


Thank You,


Mike

1127
General / Re: Best time in processing to use SCNR
« on: 2014 October 16 18:55:37 »
Jeff,

I rarely use it before stretching. Most of the times that only causes issues. After so many hours of processing I now tend to not use it until the end of my processing.


Mike 

1128
Bug Reports / Re: Problem with saving files
« on: 2014 October 16 07:00:01 »
I'm running Windows 7 and have no issues at all with saving files in any other file format. I save in PNG for screensavers on my computers, jpg for my tablet, phone and Astrobin. The occasional tiff for transfer to friends, never an issue.

What you might want to check is that you are absolutely turning off or resetting STF once you are in the linear phase, after stretching. You can process a complete image with STF active and not realize it. When you go to save it the file will be dark.

It's just a guess.


Mike

1129
Eric,

Like Gerald said we can only guess without your parameters and files. Now for a guess, make sure that Frame adaptation is not checked.



Mike

1130
Gallery / Re: IC1396A Ha in wide field
« on: 2014 October 12 10:16:02 »
Philippe

Wonderful details.


Mike

1131
General / Re: Help with Mosaic
« on: 2014 October 09 20:33:26 »
Hi Scott,

I would suggest going with the ImageSolver script. Then MosaicByCoordinates script. Last is the GradientMergeMosaic tool. That combination works much better for wide field projections like your doing, at least that's what I've found when I am working with larger wide mosaics.


Mike

http://www.astrobin.com/users/msmythers/

1132
oetie,

It's more of a case of using an un-modded camera. While some Ha will be recorded with an un-modded camera those levels are 75 percent or greater less then the rest of the spectrum. Just depends on the IR-cut filter in the camera. For some areas with very bright Ha regions an un-modded camera with many subs can work to some degree. Also careful selective color saturation and noise reduction can help. The simplest solution is a modded DSLR or a CCD.

Here is what I was able to do with your image quickly.  This is the full resolution of the IC1396 area. Also the history for my processing. You can make out the outline of the IC1396 area. In general I think it's a nice capture with a 50mm lens on an un-modded DSLR.


Mike

1133
General / Re: InterChannelCurves
« on: 2014 October 03 12:12:47 »
Eddy,

Go to the Process menu, then to Modules, then Install Modules.



Mike

1134
Image Processing Challenges / Re: M31
« on: 2014 September 23 12:23:27 »
Paul

Very nice first processing. This is very nice data. Thanks for sharing.

What I would say as areas to work on before stretching is ColorCalibration and the use of MultiscaleLinearTransform for noise reduction. Then use the MaskedStretch tool for the actual stretch. With these steps processing after stretching becomes much easier.

Here is my quick process of your data. I cropped out the problem areas.


Mike

1135
Gallery / Re: Full sky mosaic. Test of MosaicByCoordinates
« on: 2014 September 01 03:57:09 »
Andres

Very, very impressive image. Your new experimental version of ImageSolver looks like it's working great. Looks like something I could have used for my 15 panel that I finished last month.
http://pixinsight.com/forum/index.php?topic=7435.0


Mike


1136
Gallery / Re: Taurus to Cygnus 15 Panel Mosaic
« on: 2014 August 22 18:34:14 »
Craig,

Sounds like you have a good amount of data for a very nice mosaic.

Any wide field image with such a low resolution lens, focus will be critical. For both a good image and for the image solving. When I find focus with my camera lens for the night I tape the focus ring to the lens body. I use manual lenses. This prevent any chance of a mishap during the nights session. I also use a dew heater and large sun shade. I hate surprises. 

Since my image captures are so different in quality it's hard to give you a good detailed workflow. Each image required very different parameters. The best suggestion I can give you is the normal start of DynamicCrop,ABE or DBE. Do a color calibration how ever you want. Then its noise reduction and stretching. I like the new MLT and then MaskStretch. From there it is really image dependent with wide images. That is if you have variable sky conditions. I used ExponentialTransformation and the Background Enhance script in many of my images.

If you can build your mosaic from images of similar qualities then start with crop/ABE-DBE and ColorCal. Then build your mosaic with the linear images. This will allow GradientMergeMosaic to do all your blending. At this point you can then process the whole mosaic for a better quality image. I could not do this so I manually used Statistics and HST to get as even of a background appearance as possible across all panels.

In ImageSolver with processed, wide field, non-linear images I start with a magnitude limit of 8 and if needed raise it. I use Bright Stars and Polygons. Make sure you have your pixel size and focal distance set. I always check that they are correct. If you resampled your image then you need to change one of these settings to follow the resampling. You might also need to change the Star sensitivity setting. Once you have your image solved check it with the AnnotateImage script and the Constellation Lines. If the registration is off try ImageSolving again with Triangles. I've had a few very wide images where this makes a difference.

I missed an important bit of information When solving wide images. Try to pick an object close to the center of your field of view for the object search. Or if you know the coordinates of the center of your image use that.

With patience I haven't had many images that ImageSolver can't handle as long as the resolution isn't too low. The other option is to use CatalogStarGenerator and ManualImageSolver.

I hope this helps.


Mike

1137
Gallery / Re: Taurus to Cygnus 15 Panel Mosaic
« on: 2014 August 22 10:31:05 »
Hi Chris,

The process is easy but really computer intensive. The images that MosaicByCoordinates created were then used in GradientMergeMosaic. Those 2 steps are the easy part. The hard part is image solving non-linear extremely wide images that are very low resolution. Even that was quick once I found the right settings in the ImageSolver script.

Now I have a living image that can grow with more panels.


Mike

1138
Gallery / Taurus to Cygnus 15 Panel Mosaic
« on: 2014 August 20 21:32:10 »
Hi,

I thought I'd share a very poor quality image that I think is very good for what it is. A 15 panel mosaic that covers close to 150 degrees of the sky. While the images and the capture of the images are mostly poor the sum of them is very different. I used images from 4 different camera lenses. A 20, 45, 90 and 135mm lens on a Sony Nex-5 mirrorless camera. The images were taken over the last year and a half or so. I live on the east coast of Florida with heavy light pollution, very poor skies due to high temps and humidity. None of the images were taken with exposures longer then 30 seconds. They all varied in total exposure time. The panel with the Pleiades and the California nebula was the longest at 1.4 hours of total exposure time and completely overhead.

Because of the wide variation in image quality and saturation levels I did this mosaic with processed images. Completely non-linear images. I matched(as close as possible) brightness levels with Statistics and HistogramTransformation. I had to resample every image because of the final mosiac size and my computer locking up. 10937x4645 is the processed size and one half of what the actual size could have been. I ran all panels through the wonderful Image Solver script and was able with much trial and error get each one to solve. I used Mosaics by Coordinates(can't do this without it) and then GradientMergeMosaic to bring them together. 3 excellent pieces of code worth the price of admission. This was the best work I've ever done with PixInsight and the most fun.

Again while not a great image, not a great registration in areas but it is something very few people have done from there front yard.

http://www.astrobin.com/107815/  Image Only

http://www.astrobin.com/107816/0/ Image annotated


Mike


 

1139
The short answer is yes your image can have more contrast and no this is not as good as your data gets. I did not work with your fit file, only your jpg just to show that there is more even in your final image. The proper way would be to start from the beginning though.

All I did was make a clone of your image. Then applied a star mask and reduced the smaller stars with MorphologicalTransformation. I then applied color to the stars and the background with the ColorSaturation tool. Next was the ExponentialTransformation and then the LocalHistogramEqualization tools for contrast. I them used The HistogramTransformation tool to bring the image background brightness closer to original image. I then blur this image with the Convolution tool. Now I'm ready to blend the 2 images together with PixelMath. The final step was make a star mask again and add some color back into the stars.

Like I said this would not be the way I like to go about this but it does show that this image can show a more contrast looking MilkyWay.


Mike

http://www.astrobin.com/users/msmythers/

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