gistfile1.py

"""Exports a Nuke ColorLookup node as a 1D CSP

The "master" curve becomes the prelut curve, and the red/green/blue curves
are the R/G/B curves

All curves are linearly sampled between 0 and 1
"""

import nuke


def make_log_to_lin(node = None, metadata = None):
    if node is None:
        node = nuke.selectedNode()

    assert node.Class() == "ColorLookup" # probably not necessary, but safe for now

    out = ["CSPLUTV100"]
    out.append("1D")
    out.append("")
    out.append("BEGIN METADATA")
    if metadata is not None:
        out.append(metadata)
    out.append("END METADATA")

    prelut_numsamples = 1025

    prelut_in = []
    prelut_out = []
    for x in range(prelut_numsamples):
        interpo = float(x)/(prelut_numsamples-1)
        prelut_in.append(interpo)
        prelut_out.append(
            node['lut'].getValueAt(interpo, 0))

    for x in range(3):
        out.append("%s" % prelut_numsamples)
        out.append(" ".join(["%.05f" % x for x in prelut_in]))
        out.append(" ".join(["%.05f" % x for x in prelut_out]))

    out.append("")
    out.append("1025")

    numsamples = 1025
    for x in range(numsamples):
        interpo = float(x)/(numsamples-1)

        r = node['lut'].getValueAt(interpo, 1)
        g = node['lut'].getValueAt(interpo, 2)
        b = node['lut'].getValueAt(interpo, 3)

        formatted_float = "%.05f %.05f %.05f" % (r, g, b)
        out.append(formatted_float)

    return out


if __name__ == "__main__":
    print "\n".join(make_log_to_lin())

this is so awesome.