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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I have a very old GDAL based tool I wrote that creates JPEG thumbnails for GeoTiff’s. Since the GeoTiff’s can be any size and I used a perl script to compute the aspect ratio so I can center a reduced size image in a square thumbnail.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m looking for any suggestions as to how I can look into the problem which is described below.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This has been running for years. Recently a customer who receives these started scanning the JPG’s for security threats. Turns out that the JPG’s I’ve been writing have garbage data after the JPEG EOI marker.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Since our production system has a very old version I upgraded GDAL to 1.8.1 and have observed the same problem. Turns out it appears to be VRT related and only happens with single band (black/white imagery).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I use gdal_tranlsate to just translate the image to JPEG I get a properly placed EOI (d9ff):<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>[ealpert@sbsenoklgmt07] PACK $ gdal_translate -of JPEG 1020010016BB5500.tif 1020010016BB5500_new.jpg<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>Input file size is 1356, 7444<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0...10...20...30...40...50...60...70...80...90...100 - done.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>ealpert@sbsenoklgmt07] PACK $ od -t x2 1020010016BB5500_new.jpg | tail<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610460 288a 8aa2 a228 288a 8aa2 a228 288a 8aa2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610500 a228 288a 8aa2 a228 288a 8aa2 a228 288a<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610520 8aa2 a228 288a 8aa2 a228 288a 8aa2 a228<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610540 288a 8aa2 a228 288a 8aa2 a228 288a 8aa2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610560 a228 288a 8aa2 a228 288a 8aa2 a228 288a<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610600 8aa2 a228 288a 8aa2 a228 288a 8aa2 a228<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610620 288a 8aa2 a228 288a 8aa2 a228 288a 8aa2<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610640 a228 288a 8aa2 a228 288a 8aa2 a228 2b8a<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>10610660 <b><span style='color:red'>d9ff<o:p></o:p></span></b></span></p><p class=MsoNormal><b><span style='font-family:"Arial monospaced for SAP";color:red'><o:p> </o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I create a VRT to center the image then use gdal_translate to convert I get the following error message and the JPEG has garbage at the end but can still be viewed without any problems in all applications:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>ERROR:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>bit length overflow<o:p></o:p></p><p class=MsoNormal>code 3 bits 6->7<o:p></o:p></p><p class=MsoNormal><br>VRT: <o:p></o:p></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><VRTDataset rasterXSize="1024" rasterYSize="1024"><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <NoDataValue>255</NoDataValue><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <VRTRasterBand dataType="Byte" band="1"><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <ColorInterp>Gray</ColorInterp><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <NoDataValue>255</NoDataValue><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <ComplexSource><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <NODATA>0</NODATA><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <SourceFilename relativeToVRT="1">./1020010016BB5500.tif</SourceFilename><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <SourceBand>1</SourceBand><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <SrcRect xOff="0" yOff="0" xSize="1356" ySize="7444"/><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> <DstRect xOff="419" yOff="0" xSize="186" ySize="1024"/><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> </ComplexSource><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'> </VRTRasterBand><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'></VRTDataset><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>[ealpert@sbsenoklgmt07] PACK $ gdal_translate -of JPEG test.vrt test.jpg<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>Input file size is 1024, 1024<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0...10...20...30...40...50...60...70...80...90...100 - done.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>bit length overflow<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>code 3 bits 6->7<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>[ealpert@sbsenoklgmt07] PACK $ od -t x2 test.jpg | tail<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231300 90bb 1db7 3ee6 d116 d6fe f50c a157 126c<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231320 ff32 6f98 fb44 9a7f 1f57 7db8 9f90 99ff<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231340 047e 65ce b9f3 fe78 cdcf 4137 e390 105f<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231360 bfaf f372 1fed bd27 a8fe 002b 6c9d bbff<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231400 163d 637d bfe7 b716 ebfe ff7a f6a6 97c3<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231420 fad2 fb37 16fa f160 b7fe ebab 2e5f f985<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231440 ef6f f9b1 b347 293b 1037 9fbe 416f 697b<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>0231460 b1fd 84ea 8b9b 690b 13ff 5707 07fc df17<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial monospaced for SAP";color:red'>0231500 ef84 087f 870e e51b 0127 0000<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'>Note there is no EOI marker. <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Arial monospaced for SAP"'><o:p> </o:p></span></p></div><PRE>This electronic communication and any attachments may contain confidential and proprietary
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