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| Note |
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Try to ensure the grey card positioned as close to perpendicular to the camera as possible. |
You will need to know the grey value at least one of the tiles, ideally a mid-grey, for calibration.
See: Grey Cards | Known Values
Optimal Camera Settings
For best results, it is recommended to shoot -2.5 stops underexposed when spot metering on a middle grey card (50%). An under-exposed image will preserve the specular highlights, whilst maintaining a good amount of the shadows.
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