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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi list,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I’m trying to assembly some RGBA tiff in one with gdalbuildvrt and then to translate them to a RGB TIFF tiled file YCBCR jpeg compressed.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>No problem… But now, I would like to get a white color in the background instead of the black.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The following commands work but I get nodata (and so, black) on any white pixels whereas I just wanted to convert alpha to white… The problem in on the vrt.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>gdalbuildvrt assembly.vrt -srcnodata b4 –hidenodata -vrtnodata 255 *.tif<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>gdal_translate -of GTIFF -b 1 -b 2 -b 3 -co COMPRESS=JPEG -co JPEG_QUALITY=95 -co TFW=YES -co BIGTIFF=YES -co ALPHA=NO -co TILED=YES -co PHOTOMETRIC=YCBCR -co PROFILE=BASELINE assembly.vrt assembly_JPG.tif<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>gdaladdo -r gauss -ro --config COMPRESS_OVERVIEW JPEG --config JPEG_QUALITY_OVERVIEW 95 --config BIGTIFF_OVERVIEW YES --config PHOTOMETRIC_OVERVIEW YCBCR --config INTERLEAVE_OVERVIEW PIXEL --config NODATA_VALUES 255 assembly_JPG.tif 2 4 8 16 32 64 128 256<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Do you have an idea? The problem is the is not –init option, just -vrtnodata “255 255 255” to fix both background color but also the nodata bandper band…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Pierre CARREAUD</span></b><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Spécialiste en imagerie numérique</span></i><i><o:p></o:p></i></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse'><tr style='height:67.7pt'><td width=144 valign=top style='width:108.3pt;padding:0cm 5.4pt 0cm 5.4pt;height:67.7pt'><p class=MsoNormal><b><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><img width=207 height=151 id="Image_x0020_1" src="cid:image001.jpg@01CF229E.D0A27A80" alt="carte_voeux_2014"></span></b><o:p></o:p></p></td><td width=365 valign=top style='width:274.05pt;padding:0cm 5.4pt 0cm 5.4pt;height:67.7pt'><p class=MsoNormal style='margin-top:1.5pt'><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#ABCBD4;text-transform:uppercase;letter-spacing:1.5pt'>L’INGÉNIERIE DE LA DURABILITÉ</span></b><o:p></o:p></p><p class=MsoNormal align=center style='margin-top:1.5pt;text-align:center'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>SITES – Entité Île-de-France<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Division du Développement Technique</span><o:p></o:p></p><p class=MsoNormal style='margin-top:6.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>2 bis avenue du Centre</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>92500 Rueil-Malmaison, France</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Tel : 01 41 39 02 00 / Fax : 01 41 39 02 01<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a href="http://www.sites.fr/"><span lang=EN-US style='color:blue'>www.sites.fr</span></a></span></b><span lang=EN-US><o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span lang=EN-US style='font-size:16.0pt;color:black'> </span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><img border=0 width=63 height=16 id="Image_x0020_2" src="cid:image002.jpg@01CF229E.D0A27A80" alt=CARRES> </span><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#ABCBD4;text-transform:uppercase;letter-spacing:1.5pt'>EXPERTISE </span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#ABCBD4;text-transform:uppercase;letter-spacing:1.5pt'><img border=0 width=8 height=8 id="Image_x0020_3" src="cid:image003.jpg@01CF229E.D0A27A80" alt="cid:image002.jpg@01CB7A74.CDE1E680"> INSTRUMENTATION / MESURES <img border=0 width=8 height=8 id="Image_x0020_4" src="cid:image003.jpg@01CF229E.D0A27A80" alt="cid:image002.jpg@01CB7A74.CDE1E680"> INGENIERIE</span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>