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<font size="-1"><font face="Arial">Hi,<br>
<br>
I try to convert RGB tiff file (300 Mo) into ECW ( libecw 3.3
and gdal 1.8.1 that I have compiled) using this gdal_translate
command, on a Debian Squeeze : gdal_translate -of "ECW" -co
LARGE_OK="YES" -co TARGET="90" -co DATUM="RGF93" -co
PROJ="LMFRAN93" file_in.tif file_out.ecw, and I get strange
results.<br>
<br>
When I compare this results with ECW images that I get with the
same command and the same source image with Windows binaries
obtained here : <i><a class="moz-txt-link-freetext"
href="http://www.gisinternals.com/sdk/">http://www.gisinternals.com/sdk/</a></i>,
MacOSX binaries obtained here : <i><a
class="moz-txt-link-freetext"
href="http://www.kyngchaos.com/software:">http://www.kyngchaos.com/software:</a>
frameworks</i> and translation with ErMapper with the same
target, I note some differences between Linux results and other
platforms results. <br>
</font></font><br>
<font face="Arial"><small>The result on Linux seems to be fuzzy,
with poorer quality and a comparison with gdalinfo –mm –checksum
confirm that fact (<b>images – comparative tables downloadable
here :</b></small></font><b><font face="Arial"><a
class="moz-txt-link-freetext"
href="http://dl.free.fr/mkXpXahz3"> <small>http://dl.free.fr/mkXpXahz3</small></a></font></b><font
face="Arial"><small> - link "Télécharger ce fichier"). I also used
this command with Linux binaries (FWTOOLS Linux 2.0.6) and the
same differences are appearing. I try with Windows binaries 64
bits and the result is comparable to the linux one (Nevertheless
it’s perfect with 32 bits binaries).</small></font><br>
<small><br>
I tried with “libecwj2-3.3-2006-09-06.zip” and
“ImageCompressionSDKSourceCode3.3Setup_20070509.zip” source code,
I have as well tried to apply all the patches I found on the web.
It doesn’t change anything. I also tried to compile libECW 3.3 on
FreeBSD (which is quite same as MacOSX), without best results…<br>
<br>
I posted this question on a French forum (<a
class="moz-txt-link-freetext"
href="http://www.forumsig.org/showthread.php?p=286890#post286890">http://www.forumsig.org/showthread.php?p=286890#post286890</a>)
and others users do the same observations.<br>
<br>
With the decompression process (ECW to Tiff with GDAL_TRANSLATE),
I have the same and good result on each platform.<br>
<br>
It’s seems that the only problem relies on the ECW compression on
Linux, with 3.3 SDK version (I compiled examples in source tree of
SDK 3.3 and I have done some tests: it seems that the ECW
compression with SDK is bad too. That would mean this problem not
appears with GDAL…?).<br>
<br>
Does anybody know this problem ? If not, it would maybe be
interesting to add this information in GDAL WIKI in order to
prevent users of lib 3.3 (I don’t have an account to edit this
page).<br>
<br>
All ideas and remarks are welcome. I’m not C/C++ developer and
it’s very difficult for me to find an issue…<br>
<br>
Best regards,<br>
<br>
Sylvain</small><br>
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<p style="margin:0cm;margin-bottom:.0001pt"><b><span
style="font-size:10.0pt;
font-family:Tahoma;color:black">Sylvain MAFFREN</span></b><span
style="color:black"><br>
</span><span class="SpellE"><b><span
style="font-size:7.5pt;font-family:Tahoma;
color:black">Géomaticien</span></b></span><span
style="font-size:7.5pt;
font-family:Tahoma;color:black"><br>
<br>
<b>Tél</b> : 04 42 90 71 22<br>
<b>Fax</b> : 04 42 97 11 56 </span><span
style="color:black"><br>
<br>
</span><b><span
style="font-size:7.5pt;font-family:Tahoma;color:black">CRIGE
PACA</span></b><span
style="font-size:7.5pt;font-family:Tahoma;color:black"><br>
Domaine du Petit Arbois - Avenue Louis Philibert<br>
BP 10019 - 13 545 Aix-en-Provence cedex 4</span><span
style="font-size:7.5pt;
font-family:Tahoma;color:navy"><br>
<a href="http://www.crige-paca.org/"
title="http://www.crige-paca.org/
blocked::http://www.crige-paca.org/">www.crige-paca.org</a></span></p>
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