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What are scratches and what is dust? What is image information that is to be preserved? Who has not encountered this problem when using software-based scratch and dust removal! This problem has now been solved by SilverFast iSRD, by using the hardware infrared channel. Due to its long wavelength, infrared light can pass through the color emulsion of slides almost unaffected. Scratches, dust nd dirt on the other hand produce a shadow. SilverFast iSRD uses this principle; the image is scanned in two passes - the first pass applies the infrared (IR) scan and the second pass is the regular RGB scan. Following this, the scratch and dust removal is performed by calculation by an additional image channel which is automatically derived from the IR scan. The result of this correction is then displayed in the prescan.
Manual or automatic?
In the automatic mode, SilverFast iSRD operates completely on its own. The result is applied to the entire scan-frame. The user does not have to enter any settings. If the manual mode is activated, the user can decide whether he would like to work with iSRD or only with the classical SRD function.
The advantages of the manual iSRD mode are clear
- By means of masks and layers, the user can apply different corrections to different parts of the image. iSRD will then be applied only to specified areas.
- In addition, iSRD and SRD may be used in parallel. The easiest method to maximize the advantages of both technologies while minimizing unwanted side effects.
- The sensitivity of the error detection can be adjusted manually. The more sensitive the setting is, the more defects will be detected.
- By means of the correction extension, the area around a defect is defined.
