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negative-darkroom: speed up operation

Richard B. Kreckel requested to merge RBK/gegl:master into master

When getting the CIEXYZ tranmittance back, use these two mathematical identities:

  • pow(10, a) * pow(10, b) == pow(10, a+b)
  • 1/pow(10, x) == pow(10, -x)

While at it, fix the reference hash, which was broken in commit 3d5e9bc8. (This patch does not alter the hash.)

Edited by Richard B. Kreckel

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