topic Clipping produces image changes in Data Management Questions

Clipping produces image changes

JoshuaBenton — Sun, 21 Oct 2012 22:41:36 GMT

I am trying to clip a raster image band to a study area polygon but the result does not match the original. This is important because I am then exporting the results into IDRISI (by the way, comment here if you know of a good export technique) for a detailed change analysis.

Does anyone know of a reason this could be happening? There was a thread earlier on how to clip here that discussed clipping techniques. Does anyone know of a technique that will provide results better matching the original.

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Re: Clipping produces image changes

Luke_Pinner — Mon, 22 Oct 2012 04:28:45 GMT

Have you checked that the values are actually different? They're likely just visually different when viewed in ArcMap as the clip tool would have calculated statistics and then the output raster will get displayed with a 2 standard deviation stretch by default.

Double click the clipped raster in your ArcMap TOC, select Symbology tab and set stretch to None, then do the same for the input raster and they should then look the same.

Re: Clipping produces image changes

Anonymous User — Mon, 05 Nov 2012 04:06:43 GMT

Original User: bentojb

Sorry it took me awhile to respond to this. I did find that the values were actually the same and I did have to adjust the stretch in the symbology, made all the images 0-255.