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| These are the eight images that went into the final panorama.
They were shot from left to right along the bottom row, and then from
right to left along the top. Each of these was with the camera set at
the equivalent of 35mm focal length, and in portrait orientation. Even
this wide vertical field (about 54º) does not bring in the tops of the
trees. This is because for the bottom row the tripod mount was perfectly
horizontal, as is the norm when taking panoramas. For the top row, and
tips of the branches I then tilted the camera up a little.
The first picture was taken at 5:16:29 pm, and the last (immediately above it) was shot at 5:17:50 pm. So just a minute and a half from start to end, but the light changes rapidly when the sun is setting. You can probably see that the exposure was getting darker as the time ticked by. To make things worse (for the stitching together process) I had left the camera on Programmed exposure instead of setting it to fully manual exposure. The reason was I'd literally just reached this location as the sun was setting and I had to get up and running pretty fast. Anyway, the auto exposure made for even more variation of exposure between shots, compunded with the darkening of the sky as the sun set. They ranged from 1/267 @ f5.g to 1/126 @ f4, about 4 stops. So even Enblend could not iron out all of the differences and I had a jolly time adjusting the exposure by hand to smooth out the seams. To give you an idea of what had to be done here is a single image JPEG output from Hugin. Only basic alpha channel blending is in effect here. I think you'll see there's plenty of tonal variation. |
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But
by carefully adjusting the levels of each of the separate TIFF files
that Hugin can output I was able to get the final product with pretty
even tones, especially in the sky.
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