Choose a scanner for film: useful information

To transfer negatives or slides to digital format using a special device - scanner for film. It differs from an ordinary scanner that is designed to handle small transparent images that are high resolution. Although many flatbed scanners are supplied with a special module that allows you to scan slides, but the product obtained has a low quality.

Only CCD (CCD) scanning elements can provide the required depth of field for high resolution images. Therefore, all the scanners for film are built using them. Some models have a single CCD linear array. In this case, the translation to digital format required a three-fold passage of the negative. This prolongs the scan, but does not affect the result. Basically, the film scanner has a CCD matrix, and digitization of the image occurs in a single pass. Some models apply reusable pass to reduce errors in the final image.

An Important parameter, which pay attention when choosing a scanner is the optical resolution. Width the most common film is 35mm, and the image itself is even smaller. Therefore the value of the optical resolution must be no less than 2400 dpi (dots per inch). There are scanners provides 4800 and 5400 dpi. Although the current level of technology allows to achieve even greater values, this is impractical – the grain size of even fine-grained films are a lot more pixels.

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Particular attention should be paid to the dynamic range or optical density. The higher the value of this parameter, the better the scanner for negatives may transfer the half-tones and smooth color transitions. For high-quality processing of film value of optical density should be in the range of 3.2 to 3.6 D D. to Purchase a model with more optical density does not make sense, as the vast majority of films have such values.

The quality of digitization affect the bit representation of the light that characterizes the color reproduction. Modern scanner for film can have 42 or 48 bit color depth, but processing in this format is only used inside the scanner and is used to reduce “noise” conversion. The final image has a standard for computer hardware 24-bit color encoding.

A Scanner for slides in most cases connects to the computer via a USB interface. More expensive models can connect via SCSI-2 and IEEE 1394 (FireWire). In this case, quite often the kit contains a Board with this controller.

Scanner for film almost always has hardware for image enhancement. It and Digital ICE, which allows to remove image dust and scratches without affecting the underlying image, and Digital GEM, which allows to eliminate graininess, and Digital ROC, allowing to restore the colors in faded photos, etc. Quite often all these tools combined in one package Digital ICE4 Advanced. The use of these technologies greatly extend the scan, but the result is excellent. For the same transformation in Photoshop will need much more time, but the result is not guaranteed.