AGFA d-lab.3 Digital Compact Lab
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AGFA d-lab.3 Digital Compact Lab

AGFA d-lab.3 Digital Compact Lab AGFA d-lab.3 Digital Compact Lab

saal.group.com
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18.06.2014 Views

Scanner Repair Order of Calibration Procedures − Pixel correction − Dark − Bright − White balance (filter / lamp calibration) − Prescanner − RGB − IR − Shutter damping − Zoom lens Pixel Correction (Piko) This calibration ensures that the CCD chip is standardised and supplies the same signals for all pixels. Only then can the CCD be used as tool for other calibrations, e.g. for the white balance. The pixel correction is always performed when modifications are carried out on the light path which have an impact on the spacial light distribution on the CCD (e.g. lamp change, cleaning of filters and other optical components) or when the electrical properties of the chip themselves change (e.g. due to temperature). Compulsory pixel correction: − At the first switch-over to a larger size − After the installation of the mirror box − After the lamp has been moved in, even if it was not changed. − After the change of the negative mask Blemish correction: Here, defective CCD pixels are found. 4.4.28 2001-01-02 /PN 9009 AGFA d-lab.3

Repair Scanner White Balance A white balance is performed when − the light quantity on the CCD absolute and in its spectral composition has changed − a pixel correction has been performed since the last white balance The white balance ensures that an image signal of 4.095 means "white without a film". On this basis, an appropriate exposure time can be controlled as a function of the film mask and the film density. The lamp brightness is monitored for each film by the Prescanner. The overall calibration of the Prescanner is performed by force when the mirror box or the lamp is changed. Otherwise for each film when an overdrive of a photocell is recognised. AGFA d-lab.3 2001-01-02 /PN 9009 4.4.29

Repair<br />

Scanner<br />

White Balance<br />

A white balance is performed when<br />

− the light quantity on the CCD absolute and in its<br />

spectral composition has changed<br />

− a pixel correction has been performed since the<br />

last white balance<br />

The white balance ensures that an image signal of<br />

4.095 means "white without a film". On this basis,<br />

an appropriate exposure time can be controlled as<br />

a function of the film mask and the film density.<br />

The lamp brightness is monitored for each film by<br />

the Prescanner.<br />

The overall calibration of the Prescanner is performed<br />

by force when the mirror box or the lamp is<br />

changed. Otherwise for each film when an overdrive<br />

of a photocell is recognised.<br />

<strong>AGFA</strong> d-<strong>lab.3</strong> 2001-01-02 /PN 9009 4.4.29

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