Black Ink
The difference between the non-photo blue and black ink is vast enough that digital image manipulation can separate the two easily. If a black-and-white bitmap setting is scanned in, the exposure or threshold number can be set high enough to detect the black ink or dark images being scanned, but low enough to leave out the non-photo blue. On a threshold scale of 0–255, this number would be approximately 140. Only with a considerably high threshold setting will the blue be detected. However, a setting this high may greatly distort the black lines and add a lot of noise and black speckles to the image, making it almost indistinguishable. Scanning in black-and-white makes it possible for the non-photo blue still to serve its original purpose, as notes and rough sketching lines can be placed throughout the image being scanned and remain undetected by the scan head.
There is no exact colour within the Pantone Matching System that matches non-photo blue.
Read more about this topic: Non-photo Blue
Famous quotes containing the words black and/or ink:
“Civil Rights: What black folks are given in the U.S. on the installment plan, as in civil-rights bills. Not to be confused with human rights, which are the dignity, stature, humanity, respect, and freedom belonging to all people by right of their birth.”
—Dick Gregory (b. 1932)
“The very ink in which history is written is merely fluid prejudice.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)