Multi-Exposure only works with transmissive originals and with the Canoscan 9000F Mk II, I observed the scanner making two exposures. An additional advantage of Multi-Exposure is that it will also reduce noise. It’s the same type of HDR image we all know from bracketing shots with our digital camera and then processing them through an app like Photomatix or Hydra Pro.
SILVERFAST CANON 9000F SOFTWARE
The multiple scans that are obtained are combined by the software in an image that is effectively a High Dynamic Range (HDR) image. SilverFast’s Multi-Exposure functionality scans the original twice, each time with a different exposure time.
Many scanners cannot capture this dynamic range, which results in a conventional scanning operation losing image detail.
The way high-quality negatives like those made by Kodak, Fuji and Agfa were made, enabled photographers to shoot scenes with a dynamic range of up to 12 f-stops, while an ordinary slide film could easily cover eight f-stops. It is an absolute necessity when scanning Kodachrome film, with its dynamic range of 3.8, which exceeds most scanners’ capabilities.įew of us, myself included, realise film has often been made up of multiple layers with different photo-sensitive characteristics. It is meant to be used when scanning slides, negatives and film strips. Multi-Exposure is a patented exposure blending technique developed by LaserSoft Imaging. Beach at dusk – Kodak Portra 400VC, Canoscan 9000F Mk II with SilverFast 8 Multi-Exposure. I wanted to know how difficult it would be to get the extended dynamic range from the Canoscan 9000F Mk II and what the results would be like. I was very interested in this announcement as I have seen what it’s capable of with a more top-end scanner such as the Epson Perfection V700. More importantly, the inexpensive Canoscan 9000F Mk II can be manipulated by SilverFast 8 to increase its dynamic range from 1,379 greyscale values to 9,550, using SilverFast’s Multi-Exposure feature. In October the experts of scanner software SilverFast, LaserSoft Imaging, published a press release announcing the latest version of the Canoscan 9000F Mk II scanner has the software hooks to work the scanner in various high-end ways. SilverFast is by far the best application with which you can apply this technique, having been awarded the European Digital Press Association’s “Best Colour Management software of the Year” prize in 2008 for it. This method works only with scanners that allow this “manipulation” and the right software to work it. Just as with digital cameras, you can achieve a higher dynamic range by combining an exposure for highlights and one for shadowy areas. It’s as with digital cameras: there are only as many f-stops available as the sensor will “see”. Today, with a scanner, the dynamic range of any scanned photo is not just limited to capabilities of the film emulsion but also by the dynamic range of the scanner itself. It was the analogue version of trying to achieve a high dynamic range - high enough at least to represent most brightness values across a photo based on what the film emulsion was capable of. During the years I had my dark room (the real thing), I remember I had to burn areas to get a better exposure across the photo.
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