| #!/usr/bin/env python |
| |
| # Usage: get_diffmetric.py img1 img2 |
| # |
| # Helper script that calculates the DiffMetric between two given images. |
| # For debugging purposes only. |
| # |
| # Note: This requires PIL or Pillow to be installed. |
| |
| |
| from __future__ import print_function |
| import sys |
| from PIL import Image |
| |
| ## Main program. |
| img1_path = sys.argv[1] |
| img2_path = sys.argv[2] |
| |
| img1 = Image.open(img1_path) |
| img2 = Image.open(img2_path) |
| has_alpha = (img1.mode == img2.mode) |
| |
| xMin = min(img1.size[0], img2.size[0]) |
| yMin = min(img1.size[1], img2.size[1]) |
| xMax = max(img1.size[0], img2.size[0]) |
| yMax = max(img1.size[1], img2.size[1]) |
| |
| px_img1 = img1.load() |
| px_img2 = img2.load() |
| |
| num_diff_pixel = xMax * yMax |
| max_rgba_diff = [0, 0, 0, 0] |
| |
| |
| for x in xrange(xMin): |
| for y in xrange(yMin): |
| p1 = (px_img1[x, y] + (0xFF,))[:4] |
| p2 = (px_img2[x, y] + (0xFF,))[:4] |
| |
| if (p1 != p2) or not has_alpha: |
| for channel in range(len(p1)): |
| pdiff = abs(p1[channel]-p2[channel]) |
| max_rgba_diff[channel] = max(max_rgba_diff[channel], pdiff) |
| else: |
| num_diff_pixel -= 1 |
| |
| image_sizes_differ = ( |
| (img1.size[0] != img2.size[0]) or |
| (img1.size[1] != img2.size[1])) |
| total_px = xMax * yMax |
| pixel_diff_percent = (num_diff_pixel / float(total_px)) * 100 |
| if pixel_diff_percent > 100.0: |
| print("Error: Percent difference > 100%") |
| |
| print("Image Sizes Differ:", image_sizes_differ) |
| print("TotalNumPixels: ", total_px) |
| print("NumDiffPixels: ", num_diff_pixel) |
| print("PixelDiffPercent: ", pixel_diff_percent) |
| print("MaxRGBADiffs: ", max_rgba_diff) |
