Agrapha, New Oxyrhynchus Logia by E. Klostermann

By E. Klostermann

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At frequencies higher than the Nyquist frequency, information will be lost. 6 line pairs per mm There are two aliasing issues that need to be discussed: monochrome and colour. 31 show the signal at the top and the resulting image being formed on the CCD array. The resulting image formed by the CCD is shown at the bottom. At the Nyquist frequency the sensor will record all the data exactly. 31 I t is, however, interesting to note that even at the Nyquist frequency accurate recording relies on the CCD and the input signal being in register.

The resolution of the scanner is determined primarily by the number of pixels in the CCD array. 5 = approximately 300 per inch - usually referred to as ‘pixels per inch’ (sometimes ‘samples per inch’). Many flatbed scanners can be converted into transmission scanners for scanning film originals. Here, light from a light source in the lid of the scanner is transmitted through the negative or transparency onto the CCD. This method of scanning film is best suited to medium- and large-format transparencies.

However, drum scanners do provide the highest quality of image from medium- and large-format film. Their major drawback is that all critical decisions regarding cropping and placement must be made via communication between the scanner operator and designer. With the advent of desktop computers capable of handling large images, the need for a method of inputting images directly onto the page led to the development of the desktop scanner. Here there are basically two types, film scanners and flatbed scanners, designed primarily for print, but which can also be converted to scan transparent materials.

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