Premultiply alpha channel to avoid dark artifacts during tranformation

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Add `Sharp.compare(file1, file2, callback)` function for comparing images
using mean squared error (MSE). This is useful for unit tests.

See:
- https://github.com/jcupitt/libvips/issues/291
- http://entropymine.com/imageworsener/resizealpha/

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This commit is contained in:

Daniel Gasienica

2015-05-06 20:58:22 -07:00

committed by Lovell Fuller

parent c792a047b1

commit ef8db1eebf

33 changed files with 755 additions and 85 deletions

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