Update feh(1)

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.It Cm -B , --image-bg Ar style

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Use style as background for transparent image parts and the like.

Accepted values: default, checks, or a XColor (eg. #428bdd).

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The default for windowed mode is checks, while fullscreen defaults to black.

Use

.Ar style

as background for transparent image parts and the like.

Accepted values: default, checks, or an XColor

.Pq eg. Qo black Qc or Qo #428bdd Qc .

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In windowed mode, the default is checks

.Pq a checkered background so transparent image parts are easy to see .

In fullscreen and background setting mode, checks is not accepted and the

default is black.

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.It Cm -i , --index

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