Why Adobe Acrobat is not recognizing text on black backgrounds

I was surprised when I first discovered this. I thought Adobe was supposed to have the best OCR software in in the world, I tested in on few backgrounds, white text on black background - not working, yellow text on black background - not working..
I was disappointed, I had to use onlineocr, which did better job than Adobe Acrobat, it discovered all kinds of texts, bold fonts, text on multi-colored background - things that Acrobat OCR couldn't recognize..

Hi Anubha,
Thanks for your help.
In Finder ...... > Twain Data Sources I found two files, "Canon MP980 series Network.ds" (1.9Mb) and "Canon MP980 series.ds" (2Mb). Next to Kind for both it says "Application". I don´t see the word "Package" or "PowerPC" or "Universal". However, under Where, it says "Macintosh HD>Library>Image Capture>TWAIN Data Source. This is also the same information I find on my Macbook Pro (OS X 10.10.3), but still running Acrobat CC (not upgraded yet, thankfully). I can still scan using my MBP.
I was able to scan using Image Capture.
I did not have time to go through the procedure of logging in as root user.
Frankly, this seems way to complicated. There has to be an easier fix to the problem.
I also checked Canon´s website for updated driver files, but there are none for Yosemite.
Regards,
Tor-Eddie

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    Hi Anubha,
    Thanks for your help.
    In Finder ...... > Twain Data Sources I found two files, "Canon MP980 series Network.ds" (1.9Mb) and "Canon MP980 series.ds" (2Mb). Next to Kind for both it says "Application". I don´t see the word "Package" or "PowerPC" or "Universal". However, under Where, it says "Macintosh HD>Library>Image Capture>TWAIN Data Source. This is also the same information I find on my Macbook Pro (OS X 10.10.3), but still running Acrobat CC (not upgraded yet, thankfully). I can still scan using my MBP.
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    I also checked Canon´s website for updated driver files, but there are none for Yosemite.
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