Contex IQ 2400 Series, Technical Service Manual

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Service Guide IQ / IQ Quattro
103
Sharpness
An attribute of a scanned image and also an attribute of scanner quality.
SRGB
Hewlett-Packard and Microsoft proposed the addition of support for a standard color space, sRGB, within the Microsoft operating systems, HP products, the
Internet, and all other interested vendors. The aim of this color space is to complement the current color management strategies by enabling a third method of
handling color in the operating systems, device drivers and the Internet that utilizes a simple and robust device independent color definition. This is to provide good
quality and backward compatibility with minimum transmission and system overhead. Based on a calibrated colorimetric RGB color space well suited to Cathode
Ray Tube (CRT) monitors, television, scanners, digital cameras, and printing systems, such a space can be supported with minimum cost to software and hardware
vendors.
Stitching
In large format multiple CCD camera scanners, electronic stitching adjusts for overlap in the field of view of adjacent cameras. Automatic stitching at start of scan
ensures that each camera captures the correct number of pixels independently of mechanical and thermal changes.
Subtractive Colors
The subtractive primary colors: cyan, magenta, yellow. As ink applied to a piece of paper by a printer, these colors absorb light and alter the colors seen by looking
at the printed paper. Cyan ink absorbs the red third of the spectrum, magenta ink absorbs the green third, and yellow ink absorbs the blue third. This should
theoretically cause the viewer to see a black color, but due to unavoidable impurities in the inks, there is still light reflected and the viewer sees a muddy brown. The
absence of CMY pigments results in white.
TIFF
Tagged Image File Format. One of the most common graphic file formats for line-art and photographic images.
Tonal Distribution
Tonal Distribution describes the distribution of various bright or dark tones within an image. During the scanning or image editing stage, tones can be redistributed,
lightening a dark image or darkening a light one.
Tone Compression
A term used in scanning and image editing that refers to compressing the broad range of tones and colors in an image down to the narrower range available on a
printer.
Tone Curves
The shape of the tone transfer curves can be adjusted by the user to alter color or tone correction. The lower left end of the curve typically represents the dark
portions of a picture and an upward bend will typically lighten the shadows. Similar capabilities exist by working with the middle or highlight parts of the curve. In this
way it is possible to alter only certain tonal ranges of an image without making un-wanted changes to other parts of the image.
Tone
Any color or neutral that is denser than white.
True color
True color systems provide eight bits for each of the three components (red, green and blue). Therefore true color is often referred to as 24-bit color.