Difference between revisions of "Nebulosity"

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== Installing Nebulosity ==
 
== Installing Nebulosity ==
  
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Download the appropriate file (Mac or Windows) from the Stark Labs [http://www.stark-labs.com/downloads.html Downloads] page.
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Download the appropriate file (Mac or Windows) from the Stark Labs web site:
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After installing the software, input your registration code for full access.
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Nebulosity comes with a very detailed [http://www.stark-labs.com/downloads_files/Nebulosity3Docs_v3_0.pdf User's Manual]. However, most of the information you will require can be found on these pages.
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Mac:
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https://onedrive.live.com/redir?resid=5CE0C7AF92AAA395!2860&authkey=!AAwXb0_MFajwvgQ&ithint=file%2czip
  
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Windows:
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https://onedrive.live.com/redir?resid=5CE0C7AF92AAA395!2861&authkey=!AKbSl8xZ9zpHaVc&ithint=file%2cexe
  
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== Creating 3-Colour Images ==
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After installing the software, input your registration code for full access.  To obtain a registration code, speak to your instructor or TA.
  
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If you are working with your own telescope data, you may need to [[#Pre-processing|pre-process]] your data for optimal 3-colour image results.
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'''You may only use your registration code once, so make sure you use it on a computer where you will be able to do all of the work for the project!''' If you keep re-using the registration code, you will be responsible for paying the cost of the additional copies (at $80 USD each).
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<br \>
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If the red, green, and blue frames that you are combining have already been pre-processed, follow the steps below to create your 3-colour image:
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* Open the Image menu, then select LRGB Color Synthesis.
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Nebulosity comes with a very detailed [http://www.stark-labs.com/downloads_files/Nebulosity3Docs_v3_0.pdf User's Manual]. However, most of the information you will require can be found on these pages.
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** The simplest mode is RGB. Use this if you have three colour frames, but do not have a luminance frame.
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** If you do have a luminance frame, use LRGB: Color Ratio mode.
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* Click on the "Red frame" button to load your red filter frame.
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* Repeat with "Green frame" and "Blue frame".
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* If you have a luminance frame, click on "Luminance frame" to load it.
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* Click "Apply." You should see your combined (L)RGB image in the main window. Use the "Zoom" buttons on the right-hand menu to adjust the frame so that you can see your object of interest. Your image will likely not look the way you want it to yet. There is a good chance that it may be too green, for example.  
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* Use the sliders to adjust the relative amount colour in each of the filters. Sliding the "Green" slider from 100 to 75, for example, will decrease the amount of green in your image. Click "Apply" to see how increasing or decreasing the slider affects your frame. It is a good idea to adjust just one filter at a time.
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* Once you are satisfied with the colours in your image, click "Apply" and then "OK." <br \>'''''IMPORTANT''': Once you have clicked "OK", you '''CANNOT''' use the sliders to adjust the relative amounts of each colour.'' You may therefore wish to record what the values on each slider were in case you wish to recreate your image later.
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== Pre-processing ==
 
== Pre-processing ==
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=== Align and Combine Filter Exposures ===
 
=== Align and Combine Filter Exposures ===
  
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If you are working with data that you have taken from a telescope, you will likely need to stack and align your exposures before you can combine them into a 3-colour image. This section will step you through this process using images of NGC 1232 taken with iTelescope.
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If you are working with data that you have taken from a telescope, you will likely need to [[Align and Combine]] (or "stack") your exposures before you can combine them into a 3-colour image.  
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<br \>
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*We start with two exposures in each filter, R, V, and B:
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<pre>
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=== Digital Development of Aligned Frames ===
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Calibrated-T27-NGC1232-20140929-041009-R-BIN1-300-001.fit
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Calibrated-T27-NGC1232-20140929-041531-R-BIN1-300-002.fit
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Calibrated-T27-NGC1232-20140929-034741-V-BIN1-300-001.fit
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Calibrated-T27-NGC1232-20140929-035307-V-BIN1-300-002.fit
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Calibrated-T27-NGC1232-20140929-035849-Blue-BIN1-300-001.fit
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Calibrated-T27-NGC1232-20140929-040416-Blue-BIN1-300-002.fit
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</pre>
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* First, we must combine the two exposures in each filter. To do this, open the "Batch" menu in Nebulosity and select "Align and Combine Images."
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Once your filters are aligned and combined, you will need to [[digital development|develop]] them to bring out the details in your data.
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[[Image:Align_combine_menu.png]]
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<br \>
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** Under "Output mode," select "Save stack" - this will ensure that the merged exposures are saved as a single image.  
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** Under "Alignment method," select "Translation + Rotation + Scale".
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** Leave the rest of the options as the defaults.
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[[Image:Stack_menu.png]]
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<br \>
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* Select the two exposures in the R filter.
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== Creating 3-Colour Images ==
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[[Image:select_red.png]]
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* The menu at the bottom left of the Nebulosity window will say "Click on the same non-saturated star (Shift-click to skip)".
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** Find a star in your image and hover your mouse over it. A value of 65,535 in the lower right corner indicates that the star is saturated. Try to pick a star that has a value lower than this.
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[[Image:saturated_star_annotated.png]]
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** Once you have found a suitable non-saturated star, click on it. A red circle will appear around the star. Click on the same star when indicated by the menu at the bottom of Nebulosity.
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[[Image:Red_align_star1_done.jpg]]
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** Next, find a second star. You can achieve better accuracy by selecting a star that is far away from the first star you selected. You can scroll within your image, or zoom out if necessary. Click on this second star in the second frame when indicated by the menu at the bottom.
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[[Image:Red_align_star2.jpg]]
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** You will now be prompted to save your aligned and combined image. Give it a suitable name. Here we chose <pre>NGC1232_R_stack.fit</pre>.
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[[Image:Save_red_stack.png]]
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* Repeat the steps above for the other filters (in this case, V and B). We now have three stacked files:
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<pre>
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NGC1232_R_stack.fit
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NGC1232_V_stack.fit
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NGC1232_Blue_stack.fit
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</pre>
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=== Align Stacked Exposures ===
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If you are working with your own telescope data, you may need to [[#Pre-processing|pre-process]] your data for optimal 3-colour image results.
 +
<br \>
 +
If the red, green, and blue frames that you are combining have already been pre-processed, you can proceed to [[create 3-colour images|create a 3-colour image]]

Latest revision as of 00:53, 6 January 2015

Installing Nebulosity

Download the appropriate file (Mac or Windows) from the Stark Labs web site:

Mac: https://onedrive.live.com/redir?resid=5CE0C7AF92AAA395!2860&authkey=!AAwXb0_MFajwvgQ&ithint=file%2czip

Windows: https://onedrive.live.com/redir?resid=5CE0C7AF92AAA395!2861&authkey=!AKbSl8xZ9zpHaVc&ithint=file%2cexe

After installing the software, input your registration code for full access. To obtain a registration code, speak to your instructor or TA.

You may only use your registration code once, so make sure you use it on a computer where you will be able to do all of the work for the project! If you keep re-using the registration code, you will be responsible for paying the cost of the additional copies (at $80 USD each).

Nebulosity comes with a very detailed User's Manual. However, most of the information you will require can be found on these pages.

Pre-processing

Align and Combine Filter Exposures

If you are working with data that you have taken from a telescope, you will likely need to Align and Combine (or "stack") your exposures before you can combine them into a 3-colour image.

Digital Development of Aligned Frames

Once your filters are aligned and combined, you will need to develop them to bring out the details in your data.

Creating 3-Colour Images

If you are working with your own telescope data, you may need to pre-process your data for optimal 3-colour image results.
If the red, green, and blue frames that you are combining have already been pre-processed, you can proceed to create a 3-colour image

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