topic Re: How to export lossless raster with same quality as source? in Data Management Questions https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6153#M389 <HTML><HEAD></HEAD><BODY><SPAN>Thanks for the great info.</SPAN></BODY></HTML> Thu, 03 May 2012 13:49:50 GMT BL 2012-05-03T13:49:50Z How to export lossless raster with same quality as source? https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6149#M385 <HTML><HEAD></HEAD><BODY><SPAN>Original User: tlupher</SPAN><BR /><BR /><SPAN>So I have a bunch of single-band 1500x1500 cell 1x1meter 32bit-float lzw-compressed rasters in TIFF format I am trying to export as uncompressed to the same quality as their sources.</SPAN><BR /><BR /><SPAN>Why do the uncompressed TIFF's render as lower quality than compressed originals? I know TIFF is lossless and that there is no compression quality setting so I don't know why they are looking worse...</SPAN><BR /><BR /><SPAN>Below is a comparison of Source and Export output attributes. Why are the cell statistics different if the source and output files are in a lossless file format?</SPAN><BR /><SPAN>[ATTACH=CONFIG]13982[/ATTACH]</SPAN></BODY></HTML> Tue, 01 May 2012 14:19:57 GMT https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6149#M385 Anonymous User 2012-05-01T14:19:57Z Re: How to export lossless raster with same quality as source? https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6150#M386 <HTML><HEAD></HEAD><BODY><SPAN>Original User: jbswain</SPAN><BR /><BR /><SPAN>Can you provide a visual example of what you mean by loss of 'quality?' From the source statistics should be nearly identical.&nbsp; I would consider the display resampling and perhaps make a copy of the original and generate statistics. Another test would be to</SPAN><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Loading_custom_statistics_for_display/009t0000008n000000/"> import the statistics</A><SPAN> from the source to the exported one and see if look is the same.</SPAN><BR /><BR /><SPAN>Also can you identify pixels in both rasters and compare the results.&nbsp; Since you are not changing the coordinate system, I do not think that values should be altered due to resampling, unless you are altering the spatial extent of the raster.</SPAN></BODY></HTML> Tue, 01 May 2012 17:52:06 GMT https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6150#M386 Anonymous User 2012-05-01T17:52:06Z Re: How to export lossless raster with same quality as source? https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6151#M387 <HTML><HEAD></HEAD><BODY><SPAN>I found the problem was my misunderstanding of rasters and the general rendering process in ArcMap. I learned ArcMap stretches imported rasters causing them to look super bright which I took for as 'lower quality'. I turned stretching off for one raster and noticed it looks just about the same as its source, despite the minimum range value being different by +-1 in the imported one.</SPAN></BODY></HTML> Wed, 02 May 2012 18:36:31 GMT https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6151#M387 BL 2012-05-02T18:36:31Z Re: How to export lossless raster with same quality as source? https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6152#M388 <HTML><HEAD></HEAD><BODY><SPAN>Original User: jbswain</SPAN><BR /><BR /><SPAN>There is a </SPAN><A href="http://blogs.esri.com/esri/supportcenter/2011/05/05/is-your-raster-so-bright-you-have-to-wear-shades/">blog</A><SPAN> that talks about the stretching.&nbsp; I recommend taking a look at it and it can explain the effect.</SPAN></BODY></HTML> Thu, 03 May 2012 11:47:01 GMT https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6152#M388 Anonymous User 2012-05-03T11:47:01Z Re: How to export lossless raster with same quality as source? https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6153#M389 <HTML><HEAD></HEAD><BODY><SPAN>Thanks for the great info.</SPAN></BODY></HTML> Thu, 03 May 2012 13:49:50 GMT https://community.esri.com/t5/data-management-questions/how-to-export-lossless-raster-with-same-quality-as/m-p/6153#M389 BL 2012-05-03T13:49:50Z