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One reason for this is that an 8-bit gray fingerprint image is a fundamental base when converting the image to a 1-bit image with value 1 for ridges and value 0 for furrows. This process allows for enhanced edge detection so the fingerprint is revealed in high contrast, with the ridges highlighted in black and the furrows in white.
Risa Hontiveros displaying Corazon Aquino's iconic laban (fight) hand symbol after joining the Liberal Party in their campaign in the 2010 elections.. The Laban sign is a Filipino hand gesture made by extending the thumb horizontally and the index finger pointing up, leaving the other fingers closed to create the letter L, which stands for laban (Filipino for "fight").