Hi!
I've created *.bb files as a side effect of experimenting with make4ht when preparing my paper for submitting for publication. I had absolutely no problem with using the images both with XeLaTeX and make4ht. The paper was accepted and several days ago I prepared a final version. To my surprise almost all images was scaled down by XeLaTeX. The test shows the culprit is the presence of *.bb files. There are however some *.bb files which has no such side effect. All *.bb files were created by the same version of the same program, I don't see any essential difference between them. I can live with it, but if somebody is interested I will upload a MWE to the Dropbox. Best regards Janusz -- , Janusz S. Bien emeryt (emeritus) https://sites.google.com/view/jsbien