OCR for getting text from an image. Error management

I want to use an OCR program to obtain some text in an image. The text is not black on white so I don't know if it will be possible.

wget -q -O image http://4.bp.blogspot.com/-mIE4JlppKMU/T9_mxKR__wI/AAAAAAAAASs/deHLBL21ZbE/s640/Temple%20Garden.png
convert image -crop 90%x12% +repage name
tesseract name-0 stdout
rm name-* image
wget -q -O image http://4.bp.blogspot.com/-roqIxFx13vQ/T981I3wqwOI/AAAAAAAAAQ0/cJk5AWocPO0/s1600/Tundra.png
convert image -crop 90%x12% +repage name
tesseract name-0 stdout
rm name-* image
wget -q -O image http://2.bp.blogspot.com/-gwU4mAyVWtQ/T3rwIPoaBHI/AAAAAAAAAGA/oqU6T1bxqo0/s1600/Goblin%20Grenade.png
convert image -crop 90%x12% +repage name
tesseract name-0 stdout
rm name-* image

The expected output is:

Temple Garden
Tundra
Goblin Grenade

I also want to manage the error. If it fails I wan't to make an if statement saying "Can't get name".