7 comments so far...

Jotty23 March 09, 2008, 10:55 AM
Wow, I really enjoy the mood of this picture! Did You add tho fog?

But it shows me a problem, I have too: after converting to monocrome, there is much more noise than before, esp. in the darker regions of the pictures.

Does someone know what to do?

YMIhere March 09, 2008, 04:49 PM
One thing you can do is to decompose the original color picture and see if you have the same amounts of noise on each channel - for example, my camera has much less noise on the green channel. If you have such a situation, you might use the "beeter channel" more in the darker parts of the image. This helps a little
Tim Jacobs March 09, 2008, 08:24 PM
I will often use the greystoration plug-in to reduce noise, although on this one I didn't.

This picture was taken with one of those disposable cameras (I don't trust taking my expensive digital camera on canoe trips!). When the pictures are developed I ask to have a CD made as well. I find that these images have a lot of noise.

The fog is natural.

Serge Gielkens March 10, 2008, 07:33 PM
Although Greycstoration is quite capable, it works always very slowly and makes experiments quite an ordeal. That keeps me in fact from using it. How do you work with it?
Tim Jacobs March 11, 2008, 01:30 AM
To be more precise, I use Greystoration 2 which, if memory serves me correctly, is faster than the original version. But I make use of the preview window anyway, moving to areas where I want to preserve detail and areas where I want to remove noise until a good compromise is made. Usually, I find that the most influential control is contour preservation. Also, I almost always use a single iteration and nearest neighbor interpolation.
Jotty23 March 24, 2008, 01:15 PM
@YMlhere: Thanks, I'll try that!
@Tim: I have never heard of Greystoration! Is it a program?
Serge Gielkens March 24, 2008, 10:19 PM
GREYCstoration is both a standalone program and a GIMP plugin. I works differently than the unsharp mask, is more powerful but requires more experimenting (especially the first time use might push you off).

Whereas too much unsharp mask leads to more pronounced noise, GREYCstoration results into a water paint effect. This is however less distracting, especially if GREYCstoration is only applied slightly too much.

Home page: http://cimg.sourceforge.net/greycstoration/

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