> How much memory use this detailed hf ?
It seems greatly improved if I use the funtion image pattern (6.7.11.16
Function Image) for the hf (internal) rather than a separately processed hf
image.

With external hf image, 512x384:
Peak memory used:          2297685 bytes

With internal hf image, 512x384:
Peak memory used:           902579 bytes

For some reason, the pattern comes out different for each of the two methods
(though they appear equal in their scales, randomness). Perhaps something
different in the way the noise used to calculate the pattern is perceived?

-tgq

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