Hello everyone. I'm facing this above problem when my input image is the 
attached file.

My os:                  ubuntu14.04
My input image:   in attached file(which is a .png file)
My command:      tesseract 0a2d.png out

My output:            "Tesseract Open Source OCR Engine v4.00.00alpha with 
Leptonica
                             Warning. Invalid resolution 0 dpi. Using 70 
instead.
                             Estimating resolution as 281
                             Empty page!!
                             Estimating resolution as 281
                             Empty page!!"

This engine is supposed to give the correct answer "0a2d".
I'm new to this ocr engine, so anyone can help me with this problem, many 
thanks:)

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