<div>thanks Frank, following your sugesstions I've got the raster image.</div>
<div> </div>
<div>zhonghai<br><br> </div>
<div><span class="gmail_quote">On 6/8/06, <b class="gmail_sendername">Frank Warmerdam</b> <<a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Zhonghai Wang wrote:<br>> Hi there,<br>><br>> I've got three satellite images B0, B1 and B2 from the Internet, where:
<br>><br>> B0 for the BLUE band, Landsat band 1<br>> B1 for the GREEN band, Landsat band 2<br>> B2 for the RED band, Landsat band 3<br>><br>> and I am trying to compose them together in one GeoTIFF image using
<br>> openEV, here I've got some strange symptoms:<br>><br>> if I set the stack order as B0 B1 B2 (from top to bottom), I get a image<br>> color; if I set the stack order as B2 B1 B0 (from top to bottom), I get
<br>> another image color. This is a little bit weird for me, since each image<br>> has its own band color, and these colors are the real color, i.e RGB, if<br>> I compose these three image together, the composed image should have the
<br>> nature color, and this should be unique.<br>><br>> frankly say, I am not very good at remote sensing things, your thoughts<br>> will be very helpful for me.<br><br>Zhonghai,<br><br>OpenEV and GDAL don't know which band ought to be red, green or blue
<br>except based on the order you compose them. So you should put the<br>band you want to be red first (B2), then green (B1) then blue (B0).<br><br>Best regards,<br>--<br>---------------------------------------+--------------------------------------
<br>I set the clouds in motion - turn up | Frank Warmerdam, <a href="mailto:warmerdam@pobox.com">warmerdam@pobox.com</a><br>light and sound - activate the windows | <a href="http://pobox.com/~warmerdam">http://pobox.com/~warmerdam
</a><br>and watch the world go round - Rush | President OSGF, <a href="http://osgeo.org">http://osgeo.org</a><br><br></blockquote></div><br>