Deconstructing Images

 I start with a nice input image of some flowers on my prickly pear cactus:

I then generate a "color-magnitude" diagram for some configurations:

The left two panels show R on the x-axis, and G-B on the y-axis.  The white line separating the two panels vertically represents a value of zero.  So pixels appearing above the white line have a positive G-B value, and those below the white line have a negative G-B value.  The middle two panels show G versus R-B.  The right panels show B versus R-G.  The colors of each pixel correspond to their colors in the input image.  The x-axis range is 0 to +255 (left to right).  The y-axis range is -255 to +255 (bottom to top).

Here's another example, using the image of the Earth taken by Artemis II:

Here's R vs G-B, G vs R-B, and B vs R-G

clearly picks out landmasses, ocean, clouds, and aurorae!