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Frankly, we don't have anything to do with Tesseract. I'm going to go out on a limb here and take a guess though. Did you do any preprocessing or just hand it that image? I expect it wants something cleaner.

Try extracting just the yellow pixels in a binary mask and cropping the image to the square of the license plate. That will make black letters on a white background which is probably what it expects.

If that doesn't work, sorry, but you might want to try asking their forums, or whatever they use.