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Using subdued midday sunlight and making sure the flash is OFF and that
the camera is set to macro mode a picture can be taken.
After downloading into the computer it has been cropped for size.
In a Photoshop (or similar software) 'Invert' the image.
Here you can see that a heavily blue color cast is seen on the picture
that needs to be corrected out.
You may notice that I have deliberately left an edge border, this is
for black reference if required.
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