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Photographer's Note

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Some of you may recognise this view, as my first post of this city was shot from exactly the same place, the yard of the convent of S.Clara. I went to the North of Portugal on work a month later, and on the way back home I decided to leave the highway and try my luck with a night shot.

My intention was making a more wide panorama, but it turned out that to the left there was a ugly candle light and none of the shots to the right combine well colour wise with those on their left, so I ended up using only two duplicate shots. I called it duplicate because I did two shots for each position of the camera, so in PP I could merge them in 'addition' mode to brighten them without increasing noise. I know now that I should have shot much more than just two, as that would enable me to apply another layer technique to increase resolution, much used in astronomy photo, which uses several images of the same exact subject that are merged in normal mode with different opacities equal to 1/N where N is the numeral of the layer, starting with 1 for the bottom one (50% for the 2nd, 33% for the 3rd, 25% for the 4th and so one).

Like on my earlier panorama, I didn't use any software specialized in stitching, I did it all in Gimp. It turned out that I spent much more time adjusting exposure than doing the actual joining of the images. The merging of the duplicate shots in 'addition' mode is pretty straightforward, but inevitably some areas get too oe and others keep too ue, so I used a couple of supplemental duplicate layers with masks to compensate that a bit. I doubt that it was worth the time, as the final result doesn't differ much from what I would get with much less work, but after all, I am learning, so it's a good training.

I have written some notes on the city on my first post of it.

Update 1-May-07: I posted a WS with one of the original shots, so you can see how dark they were.

Link to all my TE posts of Coimbra: http://www.trekearth.com/members/stego/photos/Europe/Portugal/North/Coimbra/

Location of the the tower on the horizon (latitude, longitude): 40.20788,-8.42662

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Additional Photos by Jose Pires (stego) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4422 W: 612 N: 7301] (24132)
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