OCR using Tesseract simple task failing

Question

I'm doing text recognition in scanned text pages and recently started trying Tesseract. I realize it sometimes struggles with some tasks so I created a region of interest in a field where I will have none to two characters to recognize, like so:

I did some cleanup to get this "C" character, however, running the picture on Tesseract:

$ tesseract image.png stdout

It still fails to recognize it and I get the following output:

Warning. Invalid resolution 0 dpi. Using 70 instead.
Estimating resolution as 275
Empty page!!
Estimating resolution as 275
Empty page!!

Is there any reason for it to be failing at this seemingly simple task?

Answer 1

Yes, it is. Reason is that you did not read documentation. First read docs, then search tesseract user forum, search SO and after that come ask question with description what technique you already try.