Hi Mark
I've tried an example 2x2 plot with a single nan pixel and it always
seems to be transparent, with normal and inverted colour maps. I've
tried the heat map. You should see the background colour of the graph,
unless the background of the graph is hidden.
If the graph has no background, for bitmap formats you should get the
colour set in the export dialog box (Bitmap background). This is
transparent by default (for PNG). I think you get the non transparent
version for other bitmap formats. In my test I got transparent and white
for PNG and JPG.
For PDF, the transparent area should render in your PDF viewer as the
normal page colour, as nothing should be drawn there.
Send me an example, if there's still a problem.
Thanks
Jeremy
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