Thk u for your answer. Yes,they give the same output except Type. Driver: PNG/Portable Network Graphics Files: SRTM_GTOPO_u30_n090e060.png Size is 4800, 6000 Coordinate System is `' Corner Coordinates: Upper Left ( 0.0, 0.0) Lower Left ( 0.0, 6000.0) Upper Right ( 4800.0, 0.0) Lower Right ( 4800.0, 6000.0) Center ( 2400.0, 3000.0) Band 1 Block=4800x1 Type=Byte, ColorInterp=Gray
1. I want to know that when I should use '-ot Byte ' and when use ' -ot UInt16 '? 2. when I use -ot UInt16 ',Must I perform histogram equalization on it? weixj2003ld, I couldn't open the link. Try "gdalinfo -mm des.png" on both the output images. I think they will both give the same output. UInt16 should give a dark image unless you perform histogram equalization on it. 2010/5/11 weixj2003ld <[email protected]> I download a elevation data (SRTM,GTOPO30) from http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp use gdal_translate -b 1 -of PNG -ot Byte source.tif des.png and gdal_translate -b 1 -of PNG -ot UInt16 source.tif des.png differently, with parameter 'UInt16',I get a black picture,with Byte,get a different one,why? BTW,I want to get a png file from elevation data(.tif),must I use command gdal_translate? Thk u in advance. -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9848167848 17.2416N 80.1426E
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