tesseract - Why is my PNG resolution with Ghostscript not what I specified? -

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i using following command in ghostscript:

gs -dsafer -sdevice=png16m -ddointerpolate -dgraphicsalphabits=4 -dtextalphabits=4 -dnumrenderingthreads=8 -ddevicewidthpoints=612 -ddeviceheightpoints=792 -r600 -o ./test_gs/output_%d.png -c 30000000 setvmthreshold -f ./test_gs/input.pdf

input.pdf 8.5''x11'' pdf looks crisp , clear. resulting png's gs produces don't good, acceptable. problem noticed though that, though i'm specifying 600 resolution ("-r600"), imagemagick's identify reporting resolution of 236.22:

  geometry: 5100x6600+0+0   resolution: 236.22x236.22   print size: 21.59x27.9401   units: pixelspercentimeter   type: grayscalealpha   base type: grayscalealpha

why this? , how can fix dpi higher (at least 300) use tesseract?

which version of ghostscript using ? can find copy of pdf examine ?


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