- r-g-gray.tif Two-dimensional color ramp. Green ramps up. Red ramps to the left. Blue is uniform medium intensity. Explained below. This image has a little over 16 bits of color information - 65535 colors.
- r-g-gray-pal.tif Version of above, rendered with a palette of 256 colors by Photoshop*.
- r-g-gray-32colors.tif Version of the 2-D color ramp with 32 colors, chosen by Photogif*.
If these gray level images are combined, for example using the 2 & 3 Variable Tool:
The resulting RGB image or color overlay is this:
2-D color ramp, lots of colors
2-D color ramp, 256 well chosen colors
2-D color ramp, 32 colors