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Hello. I read old documents (genealogy) on a microfilm reader screen. When I take a picture the corners are darker than center, making reading difficult. How correct this? (I have thousand pictures). Exemple attached.

Maybee a layer for darken the center, yhen a backlight?

Thanks in advance.

Sorry for my poor english, I am french speaking

wabru

29643_c5796b134870e0d9553bb4039bd5eca2

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Hello. I read old documents (genealogy) on a microfilm reader screen. When I take a picture the corners are darker than center, making reading difficult. How correct this? (I have thousand pictures). Exemple attached.

Maybee a layer for darken the center, yhen a backlight?

Thanks in advance.

Sorry for my poor english, I am french speaking

wabru

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This is due to the way those screens are illuminated. The lamp is directly behind the screen, causing the center to be brighter than the edges. The image sensor on a camera amplifies this effect. The only way to correct this would be using some type of HDR processing using multiple exposures. Basically speaking, you would need to take 2 or more pictures using different IS0 or exposure settings and then use software to combine the best parts of each of the images.

Wikipedia - Synthetic HDR images

 

Take responsibility for your own intelligence. ;) -Rick Brewster

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This is due to the way those screens are illuminated. The lamp is directly behind the screen, causing the center to be brighter than the edges. The image sensor on a camera amplifies this effect. The only way to correct this would be using some type of HDR processing using multiple exposures. Basically speaking, you would need to take 2 or more pictures using different IS0 or exposure settings and then use software to combine the best parts of each of the images.

Wikipedia - Synthetic HDR images

 

Take responsibility for your own intelligence. ;) -Rick Brewster

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