The Power and Limits of Film Scanner Film Restoration Techniques
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by: Guest
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While negative film scanners are extremely useful tools, they also have their limits. Their power in converting film negatives to an easily edited computer file format isn\'t something to underestimate, and many photographers simply couldn\'t get by without them.
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While negative film scanners are extremely useful tools, they also have their limits. Their power in converting film negatives to an easily edited computer file format isn't something to underestimate, and many photographers simply couldn't get by without them. However, that same power in scanning also means that flaws and blemishes, even seemingly tiny, minor ones, also get scanned in sometimes. A single speck of dust, a centimeter long streak or stain... these things are also scanned in along with the art! Unless, of course, ths scanner can prevent it. Some scanners will have only limited means of fighting off this problem, while others are more potent in delivering pristine film scans no matter what the conditions. Knowing a bit more about the common techniques scanners use for this can help you get the best scans for your money and effort.
First off, you need to realize that the higher the resolution a scan is, the more difficult it will be for a scanner to perfectly remove all blemishes and defects. The scanner can't perfectly distinguish non-image aspects of the scan from the image aspects the way a human brain would, although the technology certainly tries its hardest. So the more detailed the scan, the more likely it is that you'll get some undesired detail caught up in the scan as well, like a spot, streak, or scratch. If you want to make it easy on your scanner, you can try scanning at lower resolutions.
The basic go-to method for getting rid of scanning defects is the median filter. This accompanies many photo editing programs and tools besides just film scanners. Pixels that are excessively different from their neighbor pixels are removed and replaced with a guesstimate at the original pixel contents. Now, the scanner can only very roughly guess at this, and it does so by creating a new pixel more similar to the neighbors. The main disadvantage to this is simply that it can often destroy very fine detail as well as dust and other defects, making it a solution that is indiscriminate and lacking in finesse.
Infrared cleaning techniques are much more advanced and surgical, and depend on the actual function of the machine rather than utilizing software. By using additional sensors in combination with infrared scanning, the film is picked up by the scanner while dust and other blemishes are rendered effectively invisible. The machine can then compare the infrared scan with the ordinary scan and remove any defects as necessary. Unfortunately, while this technique is excellent in many ways and generally superior to median filters, it just can't work on silver-based monochromatic film, which limits it strictly to color scans.
Those are the two essential methods for cleaning up scans that you can expect a good scanner to have. Other models may offer further options, particularly on the software end. And, of course, you can always use independent photo editing programs to clean things up after the fact. Hopefully, knowing a bit more about how these scans work will help you in getting the artistic output you desire.
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