<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-2">
<META content="MSHTML 6.00.2900.2722" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hello! I'm using GDAL for some months
now so more or less I am still a newbi. I have two technical questions
and hope you don't mind sending them in one single mail.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1. TIFFs: If a TIFF image is saved with an
indexed palette of 256 colors, GDAL handels it as such (1 band, 256
color palette). But if a TIFF image is saved with an idexed palette of
only 16 colors, GDAL handels it as 4 band RGB (unindexed!) color image. This
seems strange to me, isn't it?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>2. Buffering. GDAL bufferizes image data while
reading it by RasterIO so next reading of same image blocks is quite faster than
the first one. I'm asking myself is there any way (and any sense) to disable
buffering to improve GDAL performance when no repeated reading of the same image
is planed? I only have to read an image grid at once and that's
it. Buffering seems like an activity that is not really needed in such a
case, and could theoretically slow down the task.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanx!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Matej</FONT></DIV></BODY></HTML>