14 aug 2007 kl. 19.50 skrev editor@xxxxxxxxxxxxxx:
A couple of years ago, there was a lot of writing on the web about what was called "grain aliasing", and as far as I can see, it is exactly the type of phenomenon that Michael describes far more correctly here. It can be a problem; most writers at that time agreed that it was best cured by higher scanning resolutions - far higher than was actually needed for the primary purpose of reproduction . followed by downsampling to the required resolution using a good interpolation algorithm. I have to admit that my own experience is limited; I´ve certainly observed the phenomenon, but not often enough to make any kind of generalizations. That said, many of us remember what happened when we tried to print over-dense prints in the darkroom: the highlights got grainy and muddy (although it was "honest" silvery graininess, not the clumping that easily comes from scanning). The ultimate remedy, now as well as then: correctly exposed and developed negs.... And, of course, all too often we didn´t get such ideal negs (not even Ansel Adams, from his own writings), so we just had to cope.... and I much prefer to cope using scanning and Photoshop instead of fighting all night in the darkroom! Per Öfverbeck "In a world without walls or fences, who needs Windows or Gates" |
