Quote:
Originally Posted by kosborn
I think this is neither art nor photography but instead data visualisation, and in fact a valid thing to do. There are lots of examples in science and medical imaging where a grey scale image with a high dynamic range is visualised with pseudo colour mapping.
As a quick and dirty example on a stretched mono image (eg Ha) you could try
R: abs(1.0 - $T)
G: abs(0.5 - $T)
B: abs(0 - $T)
[EDIT] Attached is a Lagoon Neb Ha image. The colours really aren't the best for showing the detail, but as I said, it was quick and dirty! 
With trial and error you could adjust the constant values in each expression down until it could be applied to an unstretched image. There are lots of other (better) pseudo colour palettes that could be used but they would use more complex RGB expressions. |
I agree with that approach. It is data visualization and as long as the ratios mapping to RGB are presented and no individual channel color manipulation, sharpening, levels or worse masking was done after the blend then it is a valid image. I did blend in the past Infrared and Sii as a bicolor image.
I just never thought about assigning the same data to different channels with different weights. That is more like modifying the dynamic range in each channel. I assume if the weights were 1:1:1 you'd end up with a monochrome image.