Hi All,

I need help concerning contrast of images.
Some of DSS images are displayed on my screen totally blank or totally black, surely because I made a mistake at some moment.
But I can't adjust the contrast of a given image without changing the one of nearby other images.
Let me tell you an example.
At level 5, that is a field of 10 degrees, I can see on the same screen images of IC 4756, blank, IC 4665, blank, and NGC 6653, with a normal contrast. If I click on a corner of each one, I can read the same data concerning contrast: "contrast 2550 to 12751"
Then, If I click on display, and adjust the contrast / brightness of any of these images, the contrast / brightness of the three images vary accordingly. A consequence is that, if a decrease brightness up to obtain the two blank images with a normal brightness, the third one becomes totally black.
In any way, I can only obtain a normal contrasted image and two blank ones, or, on the contrary, two normal contrasted images and a third totally black.
Any idea on how modify contrast / brightness of an image without interfering with nearby ones ?

Thanks in advance for your help.
By the way, a friendly hello from french Alps mountains, where the weather is pretty good !

Bertrand

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