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HD Ultra X Service Guide
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 com-mon 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 unwanted
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.
TWAIN
A standard method of communications that programs can use to send instructions to hardware (such as
scanners) and receive data back from them (such as pictures).
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