"Jpegpixi" is short for "JPEG pixel interpolator".
It is a command-line utility which interpolates
pixels in JFIF images (commonly refered to as
"JPEG images"). This is useful to correct images
from a digital camera with CCD defects. Jpegpixi
is unique in that it tries to preserve the quality
of the JFIF image as much as possible. Most
graphics programs decode JFIF images when they are
loaded, and re-encode them when they are saved,
which results in an overall loss of quality.
Jpegpixi, on the other hand, does not decode and
re-encode the image, but manipulates the encoded
image data, protecting the quality of the image as
much as possible.