Übersetzung für "White balancing" in Deutsch

The functionings of the individual units during the white balancing shall be set forth in greater detail below.

Why can’t I use just any white object for white balancing?

White balancing is without function for monochrome cameras.

It is also known to pivot neutral density filters into the beam path of the scanner element for light attenuation in the white balancing.

The control unit provides all standard camera functions such as white balancing, shutter timing or gain.

The reference field 60 d for white color allows balancing on a white target.

This can result in an imprecise light attenuation and, thus, in an imprecise white balancing, the reproduction quality suffering thereunder.

Since the measuring equipment normally also meets other functions in a scanner that, however, shall not be described in greater detail, the measuring equipment does not represent any additional apparatus outlay with reference to the equipment for white balancing.

The invention refers to the field of electronic reproduction technology and is directed to a method and to an apparatus for white balancing of the scanning elements of reproduction apparatus, particularly of black/white scanners and color scanners for the production of printing forms.

In case a compensation for color cast is to ensue in the white balancing of the color scanner element, the same rated color signal value is successively supplied via a switchover means 82 and the lines 52R, 52G and 52B to all three high-voltage control units 29R, 29G and 29B, so that the color signal values that have been set are identical in all three color channels and correspond to the white level.

With reference to the white level, however, what is referred to as a white balancing must see to it that the maximum scan light proceeding from a white normal is always converted into an image signal value in the photomultiplier that corresponds to the normed white level, this being achieved by an appropriate adjustment of the sensitivity or, respectively, of the gain of the opto-electrical transducer.

In order to achieve a precise and reproducible white balancing, the operator must position the scanner element to the white point with optimum precision, even given repetitions of the balancing procedure, this being involved and time-consuming.

During the scanning of the original, the sensitivity of the photomultiplier 13 has been set such by a preceding white balancing that the image signal UB corresponds to the reference signal value (white level) when scanning the white point in the original.

For the implementation of the white balancing of the invention, a controllable light attenuator is situated in the beam path of the scanner element 3 in the proximity of the pupil plane of the scanner objective 9, preferably in the pupil plane.

The switch stages 16 in the signal path of the image signal UB and the switch stages 30 and 31--symbolized by switchover means in the figure--are actuated by switching signals on the lines 32, 33 and 34 during the white balancing.

In a further exemplary embodiment for an apparatus for white balancing, both the measuring equipment of FIG.

Since the scan light proceeding from the respective white point varies from original to original and dependent on the type of original carrier (film material given transparency originals and photographic paper given opaque originals) and since the sensitivity of the opto-electrical transducers that are employed cannot be kept constant over a longer time span, a white balancing is fundamentally carried out in practice before every original scanning.

This white balancing is involved particularly in color scanners since at least three opto-electrical transducers must be balanced therein.

Since even good neutral density filters exhibit differences in spectral transmission, disturbing color displacements can occur given white balancing in color scanners, whereby it is particularly the reproduction of neutral tones that is falsified.

The structure of the scanner element 3 and its functioning during scanning of originals having been set forth, the white balancing shall now be described, this being respectively implemented preceding the actual scanning of the original at a location on the scanner drum 1 at which no original is situated.

The end of the white balancing is signalled to the time generator 35 by the second control signal on the line 55, whereby the switch of the switch stage 16 is restored into the broken-line position for the originals scanning and the switches of the switch stages 30 and 31 are restored into the position A1.

The switching signals are acquired in a time generator 35 that is activated at the beginning of the white balancing by actuating a key 36.

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