The Eagle Nebula – Part 2 of 3

Apologies for the delay in posting the rest of this series of posts on the Eagle Nebula. I am still down with a cold which has been with me since last Monday.

On with the post now.

The first stage of the process in creating pictures from the Hubble telescope archives is to use the various exposures which are freely available to us and these will appear as greyscale pictures when we download them.

The magic occours when you put these images together as one picture and then work out the detail and degree of color you want to assign to the picture.

Eagle Nebula Colored Exposures (click to Enlarge)

The picture on the left gives an idea of what the various exposures of the Eagle Nebula look like after applying color to them.  In the picture, the exposure on the left was taken with a narrow-band 673nm filter ([SII]) and I have assigned red to the exposure. The middle exposure is a narrow-band 656nm filter (H-alpha) and has been assigned a green color and the right hand exposure is a narrow-band 502 nm filter ([OIII] which is assigned blue. With each of these exposures I have assigned the color to each exposure directly through photoshop.

If you look at each of the exposures, you will see that the red and the green stand out very nicely. Blue on the other hand looks a little dull in the case of this particular picture. But even though blue looks a little drab, it is essential to the process of coming out with a detailed color picture of the Eagle Nebula and will not be ignored. I will demonstrate this in the next post.

~ by sydneystargazers on February 14, 2010.

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