Time-lapse of Sunrise

Sunrise at Gorman 9-28-11

With all the rain, I was happy to see the sky like this that morning.  I had been practicing my time-lapse for several mornings and was starting to feel more confident.  I set my aperture at f/22 which exacerbated the problem I am about to discuss.  My Canon EOS 20D had dirt on the sensor usually.  This is in part because I don't clean it enough and it does not have the auto sensor cleaning feature.  I decided to use it for time-lapse because I do not need large files.  I save only the raw files and really the 8 mp sensor is large enough.  I was very excited about the whole shoot during which I had made 430 captures until I viewed the images on my computer and discovered the blemishes.  I had been shooting at f/11 for time-lapse previously and it had not been too much of a problem.  For some reason f/stops beyond f/11 really bring out the dirt on the sensor in areas like the sky.  I really liked the sequence but could I show it with the dirt so evident.  The first day I worked on it I felt that I had failed.  I almost deleted the raw files at that point.  As I slept that night, I seemed to remember that I had read about batch blemish removal in ACR, Adobe Camera Raw.  I decided to try it.  I did not find that I was happy with the result because, in the following images, the blemish removal scarred the images (You work on the top one and apply it to all the others.  Theoretically, the blemish should be in the same location on all captures.)  I tried making an action in PS5 to remove the blemishes to no success.  The next day, as I was about to throw them all away again, I decided to try the blemish removal in ACR one more time.  I tried a slightly different technique. I placed the tool in the center of the blemish and dragged it outwards to the outside edge of it.  I was careful not to drag the tool any more than I had to.  I selected all the images in ACR and synchronized often. It worked!  I was able to make the video.  The image above still has the blemishes visible but the video used the corrected ones. 

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