scale the image so that it is over 30px in height, then it works.  i had 
the same image.
Or you can do as you say and train it to recognize that size letters.

----------------------------------------
From: "Gildo" <[email protected]>
Sent: Saturday, March 27, 2010 1:31 PM
To: "tesseract-ocr" <[email protected]>
Subject: Training tesseract with a font with an height of 7 pixel 

Hello,

I am trying to train tesseract with a font with an height of 7 pixel.
When I pass the image to tesseract with the command:

tesseract fontfile.tif fontfile batch.nochop makebox

it outputs a blank fontfile.txt
What can I do?
The original image is here: http://yfrog.com/j0fontfilep

Thanks,
Gildo

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