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Ah that's a background image. No there is no way to prevent the processing of the image in that case. calibre's PDF engine is actually a web browser. So what happens is that the browser paints with a "background image brush" calibre intercepts that call and converts that into the equivalent PDF code, however, at this point the image has already been re-processed by the browser engine, so calibre only ever sees the re-processed image.
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