see attached image. have tried various things, including this config:

tessedit_char_whitelist 0123456789:.
load_system_dawg F
load_freq_dawg F
tessedit_write_images T 
tessedit_create_boxfile T

and playing around with the source image in various ways to get it in its 
attached form. also run it with -psm 7 (and have tried 8) to no avail.
currently i get: "30:59" which is significantly better than what i was 
obtaining previously. 

based on the previous two posts and one i found on stackoverflow,  it seems 
like tesseract has difficulty classifying "digital" font characters. 

any suggested preprocessing that would improve performance here?

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