There is no histogram in raster files sitting there for you to access. You have to calculate it yourself using the pixel data. Here is a good example of doing it in C# http://www.codeproject.com/KB/cs/Image_Histograms.aspx
I would familiarize yourself with the ReadRaster functions so you know how to actually access the pixel data of GDAL raster file so you can calculate the histogram. http://trac.osgeo.org/gdal/wiki/GdalOgrCsharpRaster -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg Fiske Sent: Wednesday, January 21, 2009 8:43 AM To: [email protected] Subject: [gdal-dev] accessing the histogram Hello folks, Can somebody demonstrate how I can access the histogram of a raster image. Ultimately, I'd like to dump it to a text file as well (I have many images to assess). Thanks for any advice, Greg Gregory J. Fiske GIS Manager/Research Associate The Woods Hole Research Center 149 Woods Hole Road Falmouth, Massachusetts 02540 508-540-9900 x139 http://whrc.org [email protected] _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
