Merge pull request #4 from mandykoh/luminance-optimisation

Luminance calculation optimisation

Merge pull request #3 from mandykoh/luminance-optimisation

Luminance calculation optimisation

Merge pull request #1 from mandykoh/luminance-optimisation

Luminance calculation optimisation

Find the edges of energy transitions more accurately, and account for…

… edges of the image.

Update prism.

Update prism.

Update to prism v0.8.0.

Use sRGB transfer function for more correct luminance determination.

Expose function for getting row and column energies.

Make threshold work more intuitively and reliably at edges of images.