Возвращаюсь к теме фантомов при сканировании на Epson V700/V750. Краткое содержание предыдущих серий (целиком проблема описана на предыдущей странице):
Цитата:от:miric
При сканировании кадров с Хасселя стал замечать фантомы-затенения вдоль вертикальных рамок кадра...
Собственно, предмет разговора:
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Вчера в поисках решения уже другой проблемы снова наткнулся на эту. Точнее, на аналогичные жалобы. Не в обиду кому будет сказано, но неужели у нас всем настолько по барабану или никто не снимает/не сканирует негативы с очень светлым небом и проч?
Проблема нарисовалась под названием "V700 banding", ее обсуждали на photo.net и на Flickr.com. Вот некоторые ссылки:
http://www.photo-i.co.uk/BB/viewtopic.php?f=34&t=3465http://photo.net/digital-darkroom-forum/00PWGu
Отличный примерчик (внимание на левый верхний угол кадра):
http://www.flickr.com/photos/zoologies/5003734694
Якобы решение проблемы:
http://blog.maurizioagelli.com/2010/08/epson-v700-banding-issue-and-how-to-fix.html
Наиболее развернутым и полезным мне показался этот пост
отсюда:
[quot]After a lot of discussion with Epson Customer Service over many months (where I found the techs were very sympathetic and nice to deal with), and a lot of trial and error testing with subsequent discussions with Espon Support, it seems that this banding issue is inherent to the way the scanner operates. It's not a software issue, and no hardware fix is on the way soon. It may just be a problem inherent in flatbed scanners, or at least the ones that use the high-quality dual scan optics as on the Epson V700/750. The better news though, is that it's an otherwise decent scanner, and some things can be done to minimize the banding/streaking problem.
Basically, the ghost banding occurs when the clear edge of the film (color and B&W) is visible--and scanned--and shows up most prominently when the clear film edge directly adjacent to an area of the image area which is dense, such as a bright sky. The banding also is more visible on an even image area/subject like the sky much more so than a busy part of an image, where there is a lot of value change and the subject isn't as bright (such as grass, trees, etc.). In short, it's mostly bright and even tone areas that show the streaks. The streaks also tend to be most prominent the further away from the center of the flatbed/glass one scans. That means that scanning with the 35mm film holders, the streaks are widest in slots 1 or 4, and less wide in slots 2 or 3, closer to the middle of the glass. Additionally, if one rotates the film 180 or 90 degrees depending on where on the image the sky or dense area is, then the streaks can be further minimized and sometime eliminated. When doing this, one needs to rotate the film so that the sky is toward the center of the scanning bed, as opposed to the outer edge.
In sum, putting the film toward the center slots on the film holder and then rotating film so that the sky is toward the center seems to give the best results. Not always perfect, but better.
(And with 120 film may need to be rotated 90 degrees if it's shot with tops of images toward one end of the film or the other, as opposed to 35mm where the images usually run "left to right" more horizontally in relation to the length of the film strip. Thus, I've adapted my film holder to sit perpendicular to the length of the flatbed glass, by cutting it in half. This allows me to have the film in the holder, rotate it so that the sky in a landscape is facing in toward the center of the flatbed, and still close the scanner lid completely.)
The only other fix that Epson now has is to use a modified film holder, which has narrower openings for the film. This simply crops the edge of the film so the clear edges are not visible to the scanner. This stops the problem of banding pretty effectively, but I found it unsuitable because I want to print the full image without any cropping at all. (In theory the smaller film holder opening could correspond perfectly with the edge of the image area on a strip of film, but I've found that there is always a little bit cropped from my image.) And sometimes I do want to be able to print the "black border" around the image, which was what I liked about the flatbed scanner in the first place.
Overall, I find the quality of the scans on my V750 to be quite good, especially for the cost of this scanner compared to dedicated film scanners. The banding problem persists, and unfortunately this means that sometimes one just has to hand correct (remove) the bands in PS or other software. On some images the banding isn't as apparent at first, but temporarily adjusting levels (going darker) or darkening highlights helps make the streaks more easily visible if they are there. Then one can go figure out the worst areas and go to work....
Hope this is helpful![/quot]
Интересно, что дебильные советы типа "перезагрузите компьютер и переустановите драйвер устройства" дает не только русская служба поддержки, но и их.
Некоторые в своих рассуждениях пошли неправильным путем, прицепившись к грязи на калибровочном участке сканера. Это в корне неверное направление.
Резюме. Это проблема планшетных сканеров. На данный момент проблема Эпсоном никак не решена и, видимо, Эпсон на нее тупо забил. Есть какие-то варианты танцев с бубном а-ля сузить рамку-держатель, чтобы сканер не видел границы "поле-кадр", поворачивать кадр к краю сканера другим боком, если там нет светлого участка или вообще на 90°.
Обидно, блин.
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