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Canon-Nebulosity Tutorial for Beginners - page 6 / 9

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temperature of your light frames. If you took 180-second exposures, then take 10 or 20 dark frames at 180 seconds.

Step #7: Now that you have all your data, it’s time to process them. Suggestion: Do not attempt to process your images on the same night. If you’re like me, you’ll be fatigued. Taking digital images requires a lot of mental exercise. To get excellent images from your data, it’ll take hours to process images taken with a large format digital camera such as the EOS series. Each of your raw images will be a staggering 15.5 MB. Files that big require a lot of processing time and you should have at least 1 GB RAM.

Processing Images

It is highly recommended that you do not process your images immediately after capturing. Capturing high quality imaging is mentally taxing. Before attempting to process your RAW images into a piece of art, get some sleep and start you’re processing rested. If you think capturing was exhausting, wait until you start processing.

Stacking Dark Frame. Power up the laptop and double click, “Nebulosity.” When the window opens, check out the menus at the top. The first thing we want to do is combine your darks. You will use this process to combine your flats and bias frames also, however to keep things simple we will just do the dark frames. From the “Processing” menu, select “Align and Combine Images.” A new window will pop up and you will a choice of different alignment options. When stacking Dark, Bias or Flat frames you will press the “None (fixed) button. Uncheck “Adaptive Scale Stack to 16 Bits.” Uncheck this only when stacking Darks, Bias or Flat frames. Click “OK” and a window will come up. At the top of the window, be sure to find your folder “Trifid” that you made when you captured the images. Inside the folder, find your TrifidDark frames. Select all your Dark frames by clicking the first frame and then press “Shift + left click” the last Dark frame. All of your darks will now be highlighted in blue. Click “OPEN.” The screen will now show you all of the dark frames as they are opened. If you see a box with a crosshair, close the entire program, reopen and make sure you press the “None (fixed)” button and try again. Once all the dark frames have been opened, a new window will appear. At the very top, make sure your Save-In “is the “Trifid” folder. Click the filename box and save your stacked darks as “DarkMaster” or whatever name you wish to give it. Now click “Save.” The screen will blink and if you’ll look at the very top, it will show the name of the newly saved file, “DarkMaster.fit” Congratulations! You have just stacked all of your dark frames.

Dark Subtracting. Now you are going to apply the “DarkMaster” to the light frames. Under the “Processing” menu, select “Preprocess B&W/RAW. At this time, don’t be concerned with the Bias, Flat or Autoscale Dark. We’re just going to do the MasterDark frame. Click “Dark” and select your “DarkMaster” that you just made, then click

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