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Pencil_in_a_bowl_of_water.png: User:Theresa_knott derivative work: Gregors ( talk ) 10:51, 23 February 2011 (UTC) This is a retouched picture , which means that it has been digitally altered from its original version.
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Description: A pencil. Source: Based off of Image:Accessories-text-editor.svg, which is from archive copy at the Wayback Machine Authors: Linuxerist-went to only pencil, then touchup & Tango!- orginal archive copy at the Wayback Machine
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The difference between the non-photo blue and black ink is great 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.
The technique requires tracing or transparent paper and a sharp pen. First, place the paper over the area being impressed. Then, with moderate pressure, the desired line or pattern is used. [16] Fusing colors encourages the colored pencil pigments to be physically blended using solvents, colorless blender, or a combination of both of these ...