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Grain Reduction  
User currently offlineNicolaki From , joined Dec 1969, posts, RR:
Posted (13 years 11 months 1 week 3 days 4 hours ago) and read 1040 times:

Howdy everyone!
I would like to know is there anything possible to do to reduce the grain of a photo after having scanned it, preferably with Paint Shop Pro or Photoshop?

Nicolas Bourbillon

6 replies: All unread, jump to last
 
User currently offlineCkw From UK - England, joined Aug 2010, 731 posts, RR: 16
Reply 1, posted (13 years 11 months 1 week 3 days 1 hour ago) and read 891 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.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineUSAir_757 From United States of America, joined Jun 2000, 996 posts, RR: 8
Reply 2, posted (13 years 11 months 1 week 2 days 19 hours ago) and read 870 times:

Hi

Paint Shop Pro 7 beta has a grain reduction feature.


Click for large version
Click here for full size photo!

Photo © C. Wassell




Regards
C. Wassell



-Cullen Wassell @ MLI | Pentax K5 + DA18-55WR + Sigma 70-300 DL Macro Super
User currently offlineFastGlass From United States of America, joined Jan 2002, 0 posts, RR: 5
Reply 3, posted (13 years 11 months 1 week 2 days 12 hours ago) and read 866 times:

If you have grain, I hope it is AFTER you have altered the scan (as in sharpening). IF you have grain after a RAW scan, you will have a tough time softening the scan without losing sharp details.

User currently offlineTomH From United States of America, joined May 1999, 960 posts, RR: 2
Reply 4, posted (13 years 11 months 16 hours ago) and read 821 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.


User currently offlineChris28_17 From United States of America, joined Jul 2000, 1439 posts, RR: 10
Reply 5, posted (13 years 11 months 13 hours ago) and read 812 times:

hey tom! thats exactly how i fixed this picture... sorry i havent learned to actually post the picture but here is a link, check it out...

http://airliners.net/open.file?id=110503



CHRIS


User currently offlineTomH From United States of America, joined May 1999, 960 posts, RR: 2
Reply 6, posted (13 years 10 months 4 weeks 1 day 18 hours ago) and read 797 times:

Chris,
Dramatic sihouette effect you got there Chris. I sure don't see any grain anywhere, either. Nice job-almost as good as B&W !!!!!!



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