<div style="color:#000; background-color:#fff; font-family:tahoma, new york, times, serif;font-size:12pt"><div>Ouch!</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif; background-color: transparent; font-style: normal; ">Thank you very much, Even. I should have asked sooner, instead of going to bed at 5 in the morning... :-)</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif; background-color: transparent; font-style: normal; ">Yes, I have to read into a RGB buffer, but your solution would increase a lot the loading time for other images that are working well.</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif; background-color: transparent; font-style: normal; "><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif;
background-color: transparent; font-style: normal; ">I have read this: <a href="http://trac.osgeo.org/gdal/changeset/25107" style="font-size: 12pt; " target="_top" rel="nofollow" link="external">http://trac.osgeo.org/gdal/changeset/25107</a>. So, do you recommend me to change the code in ecwdataset.cpp and rebuild the library?</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif; background-color: transparent; font-style: normal; "><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: tahoma, 'new york', times, serif; background-color: transparent; font-style: normal; ">Thanks again!</div><div> </div><div style="font-weight:bold;">José Antonio Carmena Flores</div><div><br></div><div><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <div style="font-family: tahoma, 'new york', times, serif; font-size: 12pt; "> <div style="font-family: 'times new roman',
'new york', times, serif; font-size: 12pt; "> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">De:</span></b> Even Rouault [via OSGeo.org] <<a href="/user/SendEmail.jtp?type=node&node=5009885&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>><br> <b><span style="font-weight: bold;">Para:</span></b> jcurru <<a href="/user/SendEmail.jtp?type=node&node=5009885&i=1" target="_top" rel="nofollow" link="external">[hidden email]</a>> <br> <b><span style="font-weight: bold;">Enviado:</span></b> Viernes 19 de octubre de 2012 14:42<br> <b><span style="font-weight: bold;">Asunto:</span></b> Re: Problem using image bands<br> </font> </div> <br><div id="yiv986657627">
Selon jcurru <<a rel="nofollow" href="" target="_top" link="external">[hidden email]</a>>:
<br><div class="yiv986657627shrinkable-quote"><div class='shrinkable-quote'><br>> Hello!
<br>>
<br>> I have a problem reading an ECW image. I want to read the image using only
<br>> the first band. So I use:
<br>> int bmap[3] = {1,1,1};
<br>> GDALImage->RasterIO(
<br>> GF_Read,
<br>> x, // int nXOff,
<br>> y, // int nYOff,
<br>> dx, // int nXSize,
<br>> dy, // int nXSize,
<br>> buffer, // void* pData,
<br>> xBufSize, // int nBufXSize,
<br>> yBufSize, // int nBufYSize,
<br>> GDT_Byte, // GDALDataType eBufType,
<br>> 3, // int nBandCount,
<br>> bmap, // int* panBandMap,
<br>> 3, // int nPixelSpace,
<br>> xBufSize * 3, // int nLineSpace,
<br>> 1 // int nBandSpace
<br>> );
<br>> This is working well with some ECW images (they show as grayscale) but it
<br>> does not with another, big ECW. It shows in full RGB color, exactly the same
<br>> as if I had written int bmap[3] = {1,2,3};
</div></div>I suppose you are using the 3.3 version of the ECW SDK ? Then, it is a known
<br>issue in the SDK itself. See <a rel="nofollow" target="_blank" href="http://trac.osgeo.org/gdal/ticket/4234" link="external">http://trac.osgeo.org/gdal/ticket/4234</a> . A work
<br>around has been committed in the GDAL 2.0dev version just a few days ago.
<br><br>For currently released GDAL versions, if you only want to read one band, you
<br>could just use RasterIO() on the band object, instead of the whole dataset. If
<br>you need to read it into a RGB buffer, you just need to keep the pixel space and
<br>line space you've used in the above call, and after calling RasterIO() on the
<br>band, do a loop to copy each buffer[3*i] value into buffer[3*i+1] and
<br>buffer[3*i+2]
<br><div class="yiv986657627shrinkable-quote"><div class='shrinkable-quote'><br>>
<br>> Any idea?
<br>> Thanks in advance!
<br>>
<br>>
<br>>
<br>> --
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