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I have a box scanner and I have scanned a bunch of photographs. As you can see, I have a reflection of the camera right in the center. Any ideas on how to remove it?
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Do it again. It's guaranteed to take less time.
The reflection is baked into the pixel values. There is no way to remove it other than manually painting it out. It's not worth it.
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Did you have the Top Cover of the scanner open when you did this? If you did then do it again and Close the Cover.
Other than that I have scanned thousands of Negatives, both B&W and Color, and Slides and have Never had this happen. Of course I always closed the scanner lid.
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There is no cover. It is a camera in a box and you slide the picture in on a frame. The frame has no glass on it. I'm probably going to have to take the unit apart and put black felt on the back wall. I have tried taking a picture of just the camera and inverting it to negate the reflection but it hasn't worked.
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Yes, you need to shade all ambient light.
Alternatively, make sure the primary light source behind the slide is strong enough to overpower any ambient light - and also in itself shaded to prevent any spill. I've done quite a bit of this too, but I have mostly used flash as the light source. The big advantage of flash is that it renders all other light sources in the room irrelevant.
It also works on a standard light table, but then you need a large black sheet with a precise opening for the picture frame only.
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So it is NOT a Scanner in the normal, usual, sense of the word.
You have a Light Box.
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Yeah. Looking at the image, there seems to be more ambient light than backlight. This needs to go back to the drawing board.