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CMap

Quick Reference to Scripting Command
a=CHANMAP(MODE[0-5], smooth)
Items in CAPS are 0/1 switches or switches with more options than 0/1.


Operation Example


The Palette Used

CMap is short for Channel Map. This operator will map a palette to an image based on aspects of the image you choose. In the example above, the palette was mapped to the image based on the green channel. You can see that the pink parts of the flower where there is little green is mapped with the "low colors," black and dark red. The greenest parts of the image are mapped with the "high colors," white, yellow and red.


CMap Operation Dialog

CMap Controls

Channel

Smooth

Both of the images above were mapped to a 2 color palette with black on top and white on bottom based on the red channel . The difference between these two was that on the left smooth was not selected, on the right smooth was selected. Selecting smooth will blend the mapping color of intermediate values based on proportion. Now values that are closer to black than white will not be black, but a proportional mix of white and black, a dark grey.

Trend

Some of the controls have a Trend button next to them. These trend buttons allow you to set variables over a series of frames. Each frame of any animation may be thought of as a slice of time. The trends allow you to alter some, all, or none of the variables for a particular time slice. Trend graphs have equidistantly spaced vertical lines. For animations under 100 frames in length, each of these lines represents a frame in the animation. The number of frames in any one sequence can be altered using the Sequence controls item from the Timeline pull down menu. Animation lengths of 100 - 999 frames will be represented with a vertical bar being 10 frames, and animation length greater than 1000 frames will have a vertical bar for every 100 frames. Click here to view more information on Trends.

Remapping a FITS image


Relativistic electron populations in Cassiopeia A
M. Anderson, L. Rudnick, P. Leppik, R. Perley, and R. Braun
Codename: 95.MA.01.01 (lcasa)
Object Name: CAS A (3C 461)
Object Type: INTERSTELLAR MEDIUM: SUPERNOVA REMNANT
Click Here for Original Source at NCSA's Astronomy Digital Image Library


"science.pal" used to remap the data


The resulting image


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