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. -- Walter Dnes <[EMAIL PROTECTED]> In linux /sbin/init is Job #1 My musings on technology and security at http://tech_sec.blog.ca _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
