DLS JPEGs
Two jpegs are available for each field, one for the blue end (using BVR
data)
and one for the red end (using Rz data). In each case the blue component
of the
jpeg was made by subtracting a fraction times a red image from a bluer image,
such that the flux from low-z elliptical galaxies is nulled. The green component
is made from that same "bluer" image. The red component is made from the
red
image. In all cases sky is set to zero and the output jpeg components are
thresholded
at 1 sky sigma above sky.
Here are the algorithms:
BVR color jpegs:
- r = R
- g = B+V
- b = B+V - 0.24*R
Rz color jpegs:
- r = z
- g = R
- b = R - 2.4*z