As of the 1.4. beta versions, StarTools stores the masks you used in the StarTools.log file.
This StarTools.log file is located in the same folder as the executables. The masks are encoded as BASE64 PNG images. To convert the BASE64 text into loadable PNG images, you can use any online (or offline) BASE64 converter tool.
One online tool for BASE64 is Motobit Software's BASE64 encoder/decoder.
Simply paste the BASE64 code into the text box, select the decode the data from a Base64 string (base64 decoding) radio button, as well as the export to a binary file, filename: radio button. Name the file for example "mask.png" and click the convert the source data button.
This should result in a download of the mask as a PNG file.
The AutoMask feature is able to generate a suitable mask in most cases by selecting 'Auto-generate mask'.
The two aspects - color and luminance - of your image are neatly separated thanks to StarTools' signal evolution Tracking engine.
The 'WebVR' button in the module exports your image as a standalone HTML file.
Depth cues can also be highly instrumental in lending a fresh perspective to astronomical features in an image.
You can convert everything you see to a format you find convenient. Give it a try!