Barbara,

Now we have more customized color Look-Up Tables, you can
still use command "loadpal" to load color LUT:

   loadpal, '$SEADAS/data/common/luts/standard/02-standard_chl.lut'

More info regard modify LUT are from Mike's previous message:

A) You could modify the loaded color look-up table (LUT) using the GUI:

1) load and display the chl image
2) Functions -> Color LUT -> Load LUT
3) select the "Chlorophyll a" LUT
4) Functions -> Color LUT -> Modify LUT Colors
5) in the Modify Color Table Window, slide the Red, Green, and Blue sliders to 255
6) in the Display Window: Functions -> Refresh Window

B) You could also modify the loaded color look-up table (LUT) using the command line:

1) load and display the chl image
2) Functions -> Color LUT -> Load LUT
3) select the "Chlorophyll a" LUT
4) on the SeaDAS command line:
tvlct, r, g, b, /get
r[0]=255
g[0]=255
b[0]=255
tvlct, r, g, b
5) in the Display Window: Functions -> Refresh Window

C) But the best way to do this might be to create your own colour look-up tables. So let's use Level 2 chlorophyll as an example:

1) UNIX command line:
cp $SEADAS/data/common/luts/standard/02-standard_chl.lut $SEADAS/data/common/luts/custom/00-antonio.lut

2) edit $SEADAS/data/common/luts/custom/00-antonio.lut, changing the first two lines to something like:
Chlorophyll a (white)
255 255 255

1) load and display the chl image
3) in the SeaDAS Display Window: Functions -> Color LUT -> Load LUT
4) Change the "Standard Product Color Tables" pull-down list to "Custom Product Color Tables"
5) select your custom "Chlorophyll a (white)" LUT

Long