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It appears that you are looking at a file from the Ocean Biology Distributed Active Archive Center (OBDAAC). What tool/software are you using to examine the data? Further replies will likely be from an OBDAAC staff member - I'm asking that question to help them out in answering your query.
To set the color of the No-Data layer in SeaDAS go to preferences:
if Mac OS: "Menu > SeaDAS > Preferences",
if Linux or Windows “Tools > Options”.
Then in the Preferences Window which opens up
Click on the tab "Layer"
Click on the sub-tab "No-Data Layer"
For "No-data overlay color" select "Gray" which is the SeaDAS default. You can set it to whatever color you wish and it overrides the default color. In the next SeaDAS release, we will fix the bug which causes the default color to change to orange. Thanks for explaining the issue.