Source code for tvb.core.services.texture_to_json

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"""
Converts a color scheme texture image to json arrays

.. moduleauthor:: Mihai Andrei <mihai.andrei@codemart.ro>
"""


import numpy
from PIL import Image

def color_texture_to_list(img_pth, img_width, band_height):
    """
    :param img_pth: Path to the texure
    :param img_width: Texture width
    :param band_height: Height of a color scheme band
    :return: A list of img_width/band_height color schemes. A scheme is a list of img_width colors
    """
    im = Image.open(img_pth)
    ima = numpy.asarray(im)

    if ima.shape != (img_width, img_width, 4):
        raise ValueError("unexpected image shape " + str(ima.shape))
    tex_vs = [(i * band_height + 0.5)/img_width for i in range(img_width//band_height)]
    color_schemes = []
    for v in tex_vs:
        idx = int(v * img_width)
        color_schemes.append(ima[idx, :, :3].tolist())
    return color_schemes