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Alexander Murray and Richard Morse invented and patented the first analog color scanner at Eastman Kodak in 1937. Intended for color separation at printing presses, their machine was an analog drum scanner that imaged a color transparency mounted in the drum, with a light source placed underneath the film, and three photocells with red, green, and blue color filters reading each spot on the ...
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 higher the resolution (meaning the number of pixels per inch, "ppi"), the larger the print size. Flatbed scanners typically have a hinged cover that covers the bed, and reflects light back into the scan head. This cover is usually removed or propped open when scanning 3-D objects, to prevent damage or compression of the subject.
Video of the process of scanning and real-time optical character recognition (OCR) with a portable scanner. Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text into machine-encoded text, whether from a scanned document, a photo of a document, a scene photo (for example the text on signs and ...
20th century Xerox technology made possible the ability to copy both flat images and three-dimensional objects using the copier as a scanning camera. Such copier images could then be combined with real objects in a traditional cut-and-glue collage manner. Contemporary photograph editors in magazines now create "paste-ups" digitally.
The monitor used for soft proofing must be calibrated, so that the image on the screen looks like the image on the paper. The major problem is the difference of color spaces (RGB in monitor and CMYK in print), and this is solved by using ICC profiles for input and output devices. Moreover, colors on a monitor depend not only on its properties ...
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In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message. [1]