hot pixels

[yaronsh]

Oops, forgot to mention, my camera is a Digital Rebel.

In the images below, the hot pixel was greatly de-emphasized in the process of reducing from 6MP to 480x640 for posting here. (The JPEG compression probably didn't help either, altho I used the highest compression.) To see the pixel, you'd probably have to enlarge the image several times (thereby introducing more noise).

It's a red pixel near the top-center.

All images: Canon 28-105mm USM lense, RAW mode, converted with Canon's File Viewer Utility at shot settings (Auto WB, parameter 1) to TIF, resized and JPEG-ed with PS Elements.

Image 1) 60 seconds, A=9.0, 28mm, ISO 100.
Image 2) 13 seconds, A=16.0, 105mm, ISO 400.
Image 3) Shot with lense cap on at 60 seconds, ISO 100.

(Note: The red spot in the center of #1 is not a hot-pixel - probably either lense flare or stray light.)

Of course, the hot pixel gets increasingly annoying if I pull up any shadow detail.

In the shot with the lense cap on, there is also a faint cyan pixel in the lower left - don't know if you can make it out in this reduced version.

I took shots with the lense cap on at 1/10, 1/5, 1/4, 1/2, 1, 5, 10, 20, 30, 60 sec. The red pixel began to appear at 5 sec, the cyan pixel very faintly at 20 sec.

- Yaron