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Stitching Night Shots

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Abe C
Posted on Tuesday, June 18, 2002 - 5:35 pm:   Edit PostDelete Post

When i stitch night pictures together, the colors are changed and becomes very grainy. Is this a default action? How can i fix this? This is by far the best panoramic software I have seen.
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John Strait
Posted on Tuesday, June 18, 2002 - 9:23 pm:   Edit PostDelete Post

The result you describe is caused by the Exposure Matching and/or Exposure Correction making very bad choices.

These functions do not perform well in some extreme cases. For example, it may not be possible to exposure match a 360 degree panorama that includes images into deep shadow and into bright sun (maybe including the sun itself). The exposure correction function tries to balance the resulting image to a pleasing range of brightnesses including black and white (it is a histogram stretching function).

In particular, Exposure Correction performs poorly for night photographs. It boosts the brightness of the entire image, trying to move the average brightness to a midrange value.

I suggest you experiment by turning off Exposure Correction and/or Exposure Matching in different combinations to see if this helps.

You can control these options on Wizard step 3 or with the Blending properties dialog (Tools menu).

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