Recomb would be cool

Thanks for making this!

I’d like to use a recombination matrix (vips_recomb) to do some color space conversions (sepia and all that fun stuff). It goes beyond resizing, but would that be a good addition to this project? I haven’t tried implementing it yet but it looks straightforward enough.

[lovell]

Now available - see http://sharp.pixelplumbing.com/en/stable/api-operation/#recomb

[lovell]

Thanks Rahul, mirroring libvips’ naming would suggest recomb is best for this and the API should at least support 2d matrices via an Array of Arrays, e.g.

.recomb([[0.3588, 0.7044, 0.1368], [0.2990, 0.5870, 0.1140], [0.2392, 0.4696, 0.0912]])

Predefined matrices could live in a new sharp.matrix namespace, e.g.

.recomb(sharp.matrix.sepia)

which as you suggest can be accessed via a sharp.matrix[name] lookup, e.g.

.recomb('sepia')