"Walter Dnes" on wrote...
| http://pbase.com/waltdnes/concert20060820
|
| Start off with a free concert on a cloudy evening... and then night
| falls. Panasonic's high-ISO images are (in)famous. I took a series of
| 2048x1536 images at ISO 400, with shutter forced to 1/100th or 1/80th
| sec. The images were brightened and then binned down to 682x512. I've
| posted jpegs of both the originals and the worked-on versions.
|
| One nice side-effect of ImageMagick's "-sigmoidal-contrast" option is
| that it gets rid of the reddish pallor on under-exposed shots. Where
| the under-exposure wasn't too gross, I didn't brighten to a specific
| brightness. Instead, I brightened to the point where flesh tones look
| close to natural.
|
| The first page has hardly any difference. But as it gets dark, the
| differences really show. For the two extreme-case shots, I used
| parameters of 20,0% and 25,0%. The 0% cuases maximum brightening to
| occur around zero, which is what we want with underexposed images.
|
| I'm currently working on smaller examples for posting to the
| ImageMagick documentation site.
|
Very good results. Even the thumbnails show the differences clearly.
I look forward to your IM examples contribution.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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With some difficulity and a complete lack of experience,
Death was trying to wink. --- Terry Pratchet, "Mort"
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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