Last month I’ve been reading about programs who could read the pixels and about a program remapping the dead pixels. And after a successful firmware upgrade, I decided to give it a try.
The first utility is the DeadPixelTest program. This program can find do two things:
But how to get rid of these pixels!? Should I replace my ccd? Fortunately not, there are at least two options to fix this issue. One is to send your camera to nikon repair. The other options is this little neat program, cpix map v0.12, from this Russian guy. It uses the algorithms in the Coolpix 5700 to check and remap the hot pixels. It takes between 5 and 15 minutes to read the pixels (625 seconds on mine) and around 20 seconds to program the map that maps out hot pixels. This map is used so the software eliminates the hot photo sites and the resulting pixel is replaced by the average of the surrounding photo sites.
I took a 4-second picture after the remapping and run it through the DeadPixelTester and got zero, zip, non hot pixles out of the camera. So, quite successful operation!
After the hot pixels are remappend, you can sometimes still see them in the viewfinder. This is because the re-mapping algorithm is applied after the shot. So in the evf you see that actual ccd image. After the shot the sharpening, contrast etc are applied and is taken care map out the hot pixels and use the average of adjacent ones.
This is a log of the program when reading the ‘defective’ pixels:
NIKON NIKON DSC E5700 1.00 FIRMWARE: v583-80 S/N: 000004024402 Reading the defect pixels. Elapsed time: 627 sec (100%). Read 512 defect pixels. 1 350 865 2 560 424 3 2492 1484 4 2334 1158 5 747 529 : 511 1163 1158 512 679 1885The program stops as soon as 512 entries are found as that is the limit of the pixel map in the camera. When remapping the pixels, the utility shows this:
NIKON NIKON DSC E5700 1.00 FIRMWARE: v583-80 S/N: 000004024402 Remapping the defect pixels. Remap complete. (18 sec) It's been found 512 defect pixels.Its been doen is just over 20 seconds, you also hear the shutter so I think what actually happens is that the software starts the Coolpixes internal hotpixel detection algorithm by taking a shot with the shutter closed! Very clever!