transform.py 文件源码

def hue_change(img, intensity, value):
    """
    Change to purple/green hue
    :param img: PIL image object
    :param intensity: float > 0.1, larger the value, the less intense and more washout
    :param value: float, the colour to hue change too on a scale from -360 to 0
    :return: PIL image object
    """
    original_width, original_height = img.size

    # Don't apply hue change if already grayscaled.
    if img.mode == 'L':
        return img

    else:
        ld = img.load()
        for y in range(original_height):
            for x in range(original_width):
                r, g, b = ld[x, y]
                h, s, v = rgb_to_hsv(r/255, g/255, b/255)
                h = (h + value/360.0) % 1.0
                s = s**intensity
                r, g, b = hsv_to_rgb(h, s, v)
                ld[x, y] = (int(r * 255.9999), int(g * 255.9999), int(b * 255.9999))
    return img