The difference of these values is saved in a specific file: the ICC-profile. Afterwards the set color values are compared with the actual values of the reference file.
FAUST IT8 TARGET SOFTWARE
And exactly this target is used together with the reference file for the scanner calibration.įor the scanner calibration the target is scanned and the software measures the color patches. So a IT-8 target contains certain color patches whose exact values are saved in a reference file. The reference file is supplied together with the target. After production the color patches are measured precisely with a colorimeter and saved in a so-called reference file.
The exposure and the construction of the target is accurately controlled. For a scanner calibration you also need a specific reference-sample which contains exactly defined color patches: the so-called IT8 target. To set a clock - which means calibrating it - you need an exact time reference, for example a radio controlled clock which receives its signal from an extremely precise atomic clock. Because of this the scanning process is simplified and shortened extensively with better image quality results. By the scanner calibration you get automatically correct scans and do only rarely have to edit the pictures afterwards. Thus scan faults will be canceled at the source - the scanner. In order to correct certain scan faults the following IT-8 calibration needs to be executed.
FAUST IT8 TARGET PROFESSIONAL
This applies for low priced beginner models and for professional devices. But even the luxury clock needs to be set (= calibrated) from time to time.Įvery scanner has color faults which can be corrected by a calibration. If you compare a scanner with a watch then you know that a watch bought in a supermarket for 5 Euros has to be set every week while a swiss brand clock for 5000 Euros has to be set only once a year.
FAUST IT8 TARGET FREE
A high-end scanner indeed has less color faults than a cheaper consumer device but it is not free from color faults either. Such a device surely does not even have color faults at all!" you might say. "I just buy myself a professional scanner like the Nikon Super Coolscan 9000 ED. The effort of image edit every single picture is still sustained and relocated from the image editing software to the scanner software. Furthermore you can not visually compare the original sample which is now in the scanner being scanned with the prescan image shown on the screen. Then you would have to prescan, correct the color faults and finescan the image and that would mean that the batch scanning process wouldn't be one anymore. Just imagine you are digitalizing a magazine with 100 slides in batch processing for example with the magazine scanner Reflecta DigitDia 6000. But that would make the scan process considerably more complex. Now you could say: "Well, then I'm going to adjust the colours at the scan process with the scan software!". There it would make more sense if this fault would be eliminated at the source - the scanner. So one and the same image fault possibly needs to be corrected thousand or ten thousand times. If the scanner makes specific image faults these faults have to be corrected for every scanned picture in the image editing software. But this leads inevitably to image degradation because every single change of a finished image file means a loss in image quality. So you have to use an image editing software to correct those faults.
This means that a picture from the scanner is not identical with the original. Why you should calibrate your scanner?Īs already mentioned every scanner generates image files with specific color faults. What that means and how this exactly works we want to show you on this page. In order to get a correct image file the scanner needs to be calibrated. If our output device – the monitor – is calibrated (more information on our website screen calibration) but the input device – the scanner - is not, then although we have a correct display of the image file, we do not have a correct image file itself. This process is called calibration or profiling. Eventually they also have to be adjusted with ICC-profiles. These have to be defined with a reference color space through a comparison of set and actual values. Every input and output device generates certain color faults when image data processing. To understand whats going on you have to learn a few things about colour management. In our online-shop you can buy SilverFast Ai Studio with IT-8 targets for scanner calibrations.
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