A/D converter- a device used to an analog charge into digital formAnalog format- the principle feature of something in analog format is thatit is continuousBit depth- the number of bits of color or grayscale information that can berecorded per pixelCharge-coupled device - a solid state, light sensitive chip receptorthat converts light into an analog chargeDigital format- data stored with measured values and distinct points orpositionsDrum scanner- a type of scanner that scans images mounted on a rotatingdrumDynamic range- the gradations from light to dark that a digital imagingdevice can read or produceFilm scanner- a specially designed CCD scanner that captures images fromvarious types of filmHandheld scanner- a small scanner is moved across a page or image by handHistogram-a graphic display of highlight, midtone, and shadow values thatcorrespond to the number of pixels affected in each part of the tonal scaleInterpolation- a mathematical technique used to increase the apparentresolution of an imageLayers- a feature of image editing programs that creates multiple, editablelevellls of a single piece of artworkMask- a feature of image editing programs that protects a specified area ofan image from changes, filters, and other effects applied to the rest ofthe imagesMottling- the blotchy or cloudy appearance of an image, instead of asmooth, continuous toneNewton’s rings- an undesirable color pattern that results from interferencebetween the exposure light and its reflected beam from the closest adjacentsurfaceOptical character recognition- a system used to translate the bitmap imageof scanned text into ASCII charactersPaint effects- a feature of image manipulation programs that containsseveral tools that allow the user to create and color imagesQuantizing- a filtering process that determines the amount and selection ofdata to eliminate, which makes it possible to encode data with fewer bitsResolution- the sharpness and clarity of an imageRetouching tools- tools used in image manipulation programs to modifyimages in ways similar to methods used in darkroom photographyScan area- the section of a scanning device on which images are placed forscanningScanner- measures the color densities of an original, stores themeasurements as digital information, manipulates or alters the data, anduses the data to create four color separationsScreen ruling- the number of ruled grid lines per inch (lpi) on a halftonescreenSpatial resolution- the ability of a digital imaging device to address datain horizontal and vertical dimensionsSweet spot- a 3″ or 4″ area in the center of a flatbed scanner at which thescanner scans material at full resolutionTonal resolution- the number of bits of color or grayscale information thatcan be recorded per pixeUnsharp masking- a f some scanners that increases tonal contrast wherelight and dark tones come together at the edges of the imagesWell sites- hundreds or thousands of photosensitive elements on a CCDXY scanning technology- scanning technology that optimally positions thescanning head along XY axisREVIEW QUESTIONSThe colors and lines of an image in analog format are continuous. Thecolors and lines of an image in digital format consist of values measuredat distinct points. 8. CCD sensors separate the red, green,and blue (RGB) light reflected by anobject13.
A histogram provides a display of the pixel information. 14. Typical storage devices used for images captured by common point andshoot cameras would be:- lens- viewfinder and LCD- batteries- flash- image stabilization- exposure modes- image capture time- lighting conditions15. Layers allow the user to create multiple levels of artwork that resideon separate, overlapping layers in the same document.
16. Filters are used to apply special effects, such as patterns andtextures, to bitmap images. 17. A mask would be the image manipulation tool used to protect an area ofan image from changes and effects applied to the rest of the image.