The plugin is setup to export the photos as 8-bit sRGB JPG images.
If you would like to enable the color spaces selection box, you can do that quite easily.
Open up the folder: pixelpost.lrdevplugin
Open up the file: PixelpostExportServiceProvider.lua
Go to Line #35
Add two hyphens "--" to the beginning of the line.
It should look like this:
Code:
-- allowColorSpaces = { 'sRGB' },
Save the changes, and start up Lightroom.
You can now specify other color spaces, besides sRGB.
Although I don't recommend that you do.