Jeff Snyder
EF5
I've noticed numerous hot pixels from my EOS20D when exposure time increases beyond 1 sec. I know hot pixels are an unfortunate reality of digital photography, but how many are "normal"? I've noted it being an issue when taking extended-exposure lightning shots (>5 sec exposure). I know you can clone them out in an image editing application, and some have reportedly run across a method by which the newer Canon digital cameras automatically map dead / hot pixel when left in "Clean sensor" mode with lens cap and lens on.
At any rate, I downloaded the "Dead/Hot Pixel Test" program from THIS PAGE...I took a shot, with the lens cap on, at f/7.1, 20 sec., and ISO 200, then converted it from RAW to an 8-bit TIFF image using RawShooter. Loading it into the hot pixel program, and using the default thresholds of 60 and 250 (for hot and dead pixels, respectively), I found the following: 0 dead pixels / 41 hot pixels. This matches well with my full zoom inspection of the image(s). Is this in line with what you guys are getting? Just curious... Thanks!
At any rate, I downloaded the "Dead/Hot Pixel Test" program from THIS PAGE...I took a shot, with the lens cap on, at f/7.1, 20 sec., and ISO 200, then converted it from RAW to an 8-bit TIFF image using RawShooter. Loading it into the hot pixel program, and using the default thresholds of 60 and 250 (for hot and dead pixels, respectively), I found the following: 0 dead pixels / 41 hot pixels. This matches well with my full zoom inspection of the image(s). Is this in line with what you guys are getting? Just curious... Thanks!
