Ckw From UK - England, joined Aug 2010, 809 posts, RR: 15
Reply 1, posted (14 years 10 months 2 weeks 5 days 6 hours ago) and read 1021 times:
Probably not without a trade-off in other respects - sometimes smoothing helps (particularly in sky areas) but this will reduce the apparent sharpeness of other areas.
The question is why are you getting problem grain in the first place? Even 400 ASA (with decent film!) - if properly exposed should not produce offensive grain. Grain is usually only a problem if the image is underexposed.
If you have an even slightly underexpsoed image and you try and compensate during scanning, you will increase the problem. Instead, try making the initial scan true to the original (ie. slightly underexposed) and then adjusting the scanned image using "tone curve" in photoshop.
Another trick which might work - scan the image at a high resolution (much higher than required) and then in photoshop resample the image down to the required size, followed by application of unsharp mask.
TomH From United States of America, joined May 1999, 960 posts, RR: 2
Reply 4, posted (14 years 10 months 1 week 2 days 21 hours ago) and read 951 times:
A few of my older B&W negs had objectionable grain, most noticeable in the sky portion of the photo. What works for me in reducing the grain is to manually draw a mask around the sky. I do this by zooming in and meticulously tracing around the subject aircraft and any other objects so they aren't affected by the next step. Then I apply a softening blur to the masked area. Be sure to experiment so the softening doesn't smooth out desirable objects in the sky-like clouds. Do this after your final sharpening/unsharpening.
You shouldn't have to do this often, so if you are constantly plagued by graininess, you need to find the root cause. Good luck.