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**(a)** Imagem Original | **(b)** Image filtered with Epanechnikov filter using 5x5 mask |

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**c)** Image after manual line selection using a paint application. | **(d)** Distance using thinning and matching borders with lines perpendicular to the thinned wideline pixels. |

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**e)** CWLD algorithm response using the CIE L*a*b* 1976 delta-E and no line filter, i.e. no bright or dark lines selection. | **(f)** CWLD algorithm response using the CIE L*a*b* 1976 delta-E and a bright line filter selection. |

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**g)**** CWLD algorithm response using the CIE L*a*b* 1976 delta-E and a dark line filter selection.** | **(h) CWLD algorithm response using the CIE L*a*b* 1994 delta-E and no line filter, i.e. no bright or dark lines selection.** |

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**(i)** CWLD algorithm response using the CIE L*a*b* 2000 delta-E and no line filter, i.e. no bright or dark lines selection. | **(j)** CWLD algorithm response using the CIE L*a*b* 2000 delta-E and a bright line filter selection. |

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**(k)** CWLD algorithm response using the CIE L*a*b* 2000 delta-E and a dark line filter selection. | **(l)** CWLD algorithm response using the CMC *(l, c)* 1984 delta-E and no line filter, i.e. no bright or dark lines selection. |

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**(m)** CWLD algorithm response using the CIE L* delta-E and no line filter, i.e. no bright or dark lines selection. | **(n)** CWLD algorithm response using the CIE L* delta-E and a bright line filter selection. |

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**(o)** CWLD algorithm response using the CIE L* delta-E and a dark line filter selection. | **(p)** CWLD algorithm response using the grayscale delta-E and no
line filter, i.e. no bright or dark lines selection. Note that here the
threshold t is calculated as the standard wld algorithm. |

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**(q)** CWLD algorithm response using the grayscale delta-E and a
bright line filter selection. Note that here the threshold t is
calculated as the standard wld algorithm. | **(r) **CWLD algorithm response using the grayscale delta-E and a
dark line filter selection. Note that here the threshold t is
calculated as the standard wld algorithm. |

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**(s)** CWLD algorithm response using the RGB delta-E and no line filter (bright or dark) selection. | |