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Author Topic: Brightness and Contrast  (Read 2337 times)

StevenF

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Brightness and Contrast
« on: December 24, 2014, 08:11:06 AM »
I think it would be useful to have simple brightness and contrast adjustments for viewing photos.

I'm working with a set of 16-bit images that only have values around 0-1000 (out of 65535) so they show up as black in the viewer. I had to rescale and apply a 2 percent stretch to all the photos in other software so I could see them when placing ground control and checking the sparse cloud and model.

I thought it would be fine to use the rescaled 8-bit images for the remaining steps in the workflow. However, my dense clouds were plagued with large gaps so I tried using the 16-bit images in a few test areas. The difference was night and day. Dense clouds generated from the original 16-bit images almost completely filled the gaps that existed in the dense clouds based on the 8-bit images. So a simple bright and contrast slider could be very helpful to avoid this back and forth between 8-bit and 16-bit images.