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$\begingroup$What image do you want to extract? Do you want to get an image of the learning curve plot? You can just export it as an image: $$ $$ lc = Information[class, "LearningCurve"] $$ $$ Export["EXPORT_PATH.png", lc]$\endgroup$
lc = Information[class, "LearningCurve"]
$$ $$Export["EXPORT_PATH.png", lc]
$\endgroup$