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* Overlay: Paste the specified independent picture over the current
picture, showing through wherever it is transparent.
* Shift: Shift the picture. Specify the sizes and shift amounts in the
format "size: shift"; each size also affects all multiples of that size,
in which case the shift amount is also multiplied by the same amount.
* Hue/Shade: Specify hue adjustment and shade adjustment. The hue
adjustment is unsigned, and the shade adjustment is signed; any colours
that are in range 1 to 225 are affected; other colours remain unchanged.
=== Multidependent pictures ===
A multidependent picture lump defines several pictures which are formed
from one or more independent pictures and filters, using common sets of
base pictures and filter chains.
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