After looking around and wasting time for a solution to make the annotation.json for CreateML, I just went ahead and wrote a plugin for Photoshop (I've been trying to get it on the Plugin Marketplace, but there are too many hoops to jump through for a simple plugin). You can use the slice tool and the name feature to label your region, then just export. I recommend saving each file as a PSD since it retains the slice data. The tool will export as a PNG for you in the folder. Just open as many files as you want in the annotation.json file. Hope this helps! I don't really have a way to share it here, since Dropbox links and such do not work... So you will have to message me for it.
Topic:
Machine Learning & AI
SubTopic:
General
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