The number of shades of grey depends on the image format, how many Vue exports for the image format and how many your paint package supports.  Nice and simple...

The one that supports the least will be the controlling factor in how many you get to play with.  For example:

• 4 bits of greyscale gives 16 shades of grey
• 8 bits gives 256 shades of grey
• 12 bits gives 4096
• 16 bits gives 65,536

Personally I like to use Veritas' suggestion as it gives a bit of mood to the image.

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