Function create sepia tone. Source: https://en.wikipedia.org/wiki/Sepia_(color)
(img, factor: int)
| 6 | |
| 7 | |
| 8 | def make_sepia(img, factor: int): |
| 9 | """ |
| 10 | Function create sepia tone. |
| 11 | Source: https://en.wikipedia.org/wiki/Sepia_(color) |
| 12 | """ |
| 13 | pixel_h, pixel_v = img.shape[0], img.shape[1] |
| 14 | |
| 15 | def to_grayscale(blue, green, red): |
| 16 | """ |
| 17 | Helper function to create pixel's greyscale representation |
| 18 | Src: https://pl.wikipedia.org/wiki/YUV |
| 19 | """ |
| 20 | return 0.2126 * red + 0.587 * green + 0.114 * blue |
| 21 | |
| 22 | def normalize(value): |
| 23 | """Helper function to normalize R/G/B value -> return 255 if value > 255""" |
| 24 | return min(value, 255) |
| 25 | |
| 26 | for i in range(pixel_h): |
| 27 | for j in range(pixel_v): |
| 28 | greyscale = int(to_grayscale(*img[i][j])) |
| 29 | img[i][j] = [ |
| 30 | normalize(greyscale), |
| 31 | normalize(greyscale + factor), |
| 32 | normalize(greyscale + 2 * factor), |
| 33 | ] |
| 34 | |
| 35 | return img |
| 36 | |
| 37 | |
| 38 | if __name__ == "__main__": |
no test coverage detected