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How To Get Rid Of Grain On Photos?  
User currently offlineMark2102 From United States of America, joined Nov 2001, 350 posts, RR: 0
Posted (14 years 4 months 1 week 3 days 5 hours ago) and read 7617 times:

When I take photos, I sometimes get these little colored dots on the picture that really ruin it. I find it is when you take the photos in bad weather. Is there anyway that you could get rid of it without ruining the picture? Here is an example of what I am talking about:The stuff on the fuselage.



5 replies: All unread, jump to last
User currently offlineLouisChenevert From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 4 months 1 week 3 days 5 hours ago) and read 7587 times:

You also have a blur problem.

User currently offlineScreener5 From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 4 months 1 week 3 days 5 hours ago) and read 7588 times:

...and a contrast problem as well.

User currently offlineSerge From United States of America, joined Sep 2001, 1989 posts, RR: 2
Reply 3, posted (14 years 4 months 1 week 3 days 4 hours ago) and read 7582 times:

I use masking techniques with combination of smart blur in Photoshop 6 to rid my images of grain. I helped Craig Murray with his great 747 at sunset shot using this method.

Basically you need to zoom in on the parts of the photo where, lets say, the sky and fuselage meet and select the sky. Then you go to filters; smart blur and generally use 3.0 for the radious, 25.0 for the threshold, high quality, normal mode.

This technique can be used on the airplane itself but only works well on aircraft which are only a few colors, like a private jet for example, which probably has pure white paint with a few stripes or something.

If you want me to post some examples of images I improved or explain this further just ask  Smile/happy/getting dizzy


User currently offlineEDIpic From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 4 months 1 week 3 days 2 hours ago) and read 7554 times:

If it was a sharp picture taken in good weather, hence a faster shutter speed and a sky that isn't the same colour as the upper fuselage, you won't have that problem.


User currently offlineCkw From UK - England, joined Aug 2010, 813 posts, RR: 12
Reply 5, posted (14 years 4 months 1 week 3 days 1 hour ago) and read 7554 times:

I think the "grain" is in fact a scanning issue - I suspect the underside of the aircraft, possibly the whole pic is slightly underexposed, and you've (or your scanner) has tried to compensate for this in the scan - surely the sky wasn't that bright at the time!

Attempting to brighten in the scan often has the effect of introducing scanner noise into the shadow area - particularly if there is strong compenent in the blue channel, which would be the case with gray.

For best results, scan the picture without making any significant brightness adjustments. If necessary these should be sorted out later in Photoshop or similar using the gamma or curve controls. But as has been said, in the case of this pic, the sharpness required for A.net just isn't there.



Colin K. Work, Pixstel
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