in PR #614 there was a fix to handle the pil DecompressionBomp error, adding a new configuration setting MAX_PIXELS (Config.define('MAX_PIXELS', 75e6, "Max pixel count for images read by thumbor", "Imaging")).
unfortunately there is no way to actually see that an image-transformation ran into this.
it would be great to have some kind of warning or statistic that this happened. otherwise the server returns a 400 and you know nothing 😢