Topic Author
Posts: 342
Joined: Tue Nov 06, 2001 1:32 pm

How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 1:28 pm

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.


RE: How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 1:29 pm

You also have a blur problem.

RE: How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 2:02 pm

...and a contrast problem as well.
Posts: 1903
Joined: Thu Sep 27, 2001 2:01 pm

RE: How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 2:45 pm

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


RE: How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 5:03 pm

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.

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Joined: Fri Aug 27, 2010 12:26 am

RE: How To Get Rid Of Grain On Photos?

Thu Jan 24, 2002 5:35 pm

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 just isn't there.


Colin K. Work, Pixstel

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