<span style="font-style: italic;">"Tiled </span><span style="font-style: italic;" class="highlightedSearchTerm">TIFF</span><span style="font-style: italic;"> files
with overviews pre-built are one of the highest performance ways of serving
large </span><span style="font-style: italic;" class="highlightedSearchTerm">raster</span><span style="font-style: italic;"> images."</span><br>From: <a href="http://mapserver.gis.umn.edu/docs/howto/raster_data/?searchterm=raster%20tiff">
http://mapserver.gis.umn.edu/docs/howto/raster_data/?searchterm=raster%20tiff</a><br><br>Not sure what it means by 'overviews', though!<br><br>Presumably JPG images require decompression prior to creating the output image, whereas TIFFs can just be read straight off.
<br><br>Cheers,<br>Roland.<br><br><br><br><div><span class="gmail_quote">On 21/08/06, <b class="gmail_sendername">Léveillé, James</b> <<a href="mailto:James.Leveille@mtq.gouv.qc.ca">James.Leveille@mtq.gouv.qc.ca</a>> wrote:
</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>
<div>
<div><span><font face="Verdana" size="2">Hi,</font></span></div>
<div><span><font face="Verdana" size="2"></font></span> </div>
<div><span><font face="Verdana" size="2">I have about 4 000
georeferenced images.</font></span></div>
<div><span><font face="Verdana" size="2">I can use either
TIF (with overviews) or JPG format.</font></span></div>
<div><span><font face="Verdana" size="2">Which one should I
use with MapServer ?</font></span></div>
<div><span><font face="Verdana" size="2">Which one offers
the most performance ?</font></span></div>
<div><span><font face="Verdana" size="2"></font></span> </div>
<div><span><font face="Verdana" size="2">Regards</font></span></div>
<div> </div>
<div align="left"><font face="Verdana" size="2">__________________________________________</font></div>
<div align="left"><font face="Verdana" size="2"><strong>James
Léveillé</strong></font></div>
<div align="left"><font face="Verdana" size="2"><font size="1"><font face="Verdana"> </font></font></font></div>
<div align="left"><font color="#0000a0" face="Verdana" size="2"><strong>Intélec
Géomatique</strong></font></div>
<div align="left"><font face="Verdana" size="1">420, boul. Charest Est<br>Bureau
400<br>Québec (QC), Canada<br>G1K 8M4</font></div>
<div align="left"><font face="Verdana" size="1"></font> </div>
<div align="left"><font color="#c0c0c0" face="Verdana" size="1">Intélec Géomatique:
418.687.5000</font></div>
<div align="left"><font color="#c0c0c0" face="Verdana" size="1">MTQ: 418.380.2005
(#227)</font></div>
<div> </div></div>
</div></blockquote></div><br><br clear="all"><br>-- <br>Please note my new email address. Use other addresses at your peril.