MergeImages.py

import os
import Image

def mergeImages(images):
	
    if len(images) > 0:
        merged = Image.new('RGB', (images[0].size[0], images[0].size[1]), "black")
        pixels = merged.load()

        for img in images:
            for x in range(merged.size[0]):
                for y in range(merged.size[1]):
                    if img.getpixel((x, y)) != (0, 0, 0):
                        pixels[x, y] = img.getpixel((x, y)) 	

        return merged

def main(path):

    files = os.listdir(path)

    # read color maps in path
    colMaps = []
    colMapsPathes = []
    for el in files:
        if el[-3:] == 'tif':
            if el[-12:-10] == 'TM':
                colMaps.append(Image.open(path + el))
                colMapsPathes.append(path + el)

    mergedTM = mergeImages(colMaps)
    mergedTM.save('mergedTM.tif')

    # Remove maps for each separate object
    for i in reversed(range(len(colMaps))):
        del colMaps[i]
        os.remove(colMapsPathes[i])