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Using rough rule of thumb, and assuming powers of 2 for convenience, what image size are about the smallest images that can be expected to be reasonably free of objectionable sampling checkerboards and false contouring?

Using rough rule of thumb, and assuming powers of 2 for convenience, what image size are about the smallest images that can be expected to be reasonably free of objectionable sampling checkerboards and false contouring? Correct Answer 256*256pixels and 64 gray levels

An image of 128*128pixels shows a pronounced checkerboard pattern, while for 256*256pixels image a minimum gray level of 64 is required to remove false contouring. Also the effect is quite visible in images displayed using 16 or less uniformly spaced gray levels.

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The right of private defence extends, subject to Section 99, to the causing of death of the assailant or aggressor in the following circumstances:
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