[Gdal-dev] RE: gdal_translate versus mrsiddecode

[Chris G. Nicholas]

One more tidbit...
--------------------------------------------------------------------
pogo-> mrsidinfo /data/f04/contentapu1/apu01_2ft_aus_2.sid
mrsidinfo: (c) 2004 LizardTech, Inc. All rights reserved.

basic image info:
  format:            MRSID
  width:             188933
  height:            47333
  nband:             3
  color space:       RGB
  datatype:          uint8
  precision:         8
  dyn range min:     (natural)
  dyn range max:     (natural)
  background color:  (0, 0, 0)
  nodata color:      (255, 255, 255)
  metadata records:  20

geo coordinate info:
  X UL:              2.9673e+06
  Y UL:              1.01493e+07
  X res:             1.5
  Y res:             -1.5
  X rot:             0
  Y rot:             0

geo points (pixel centers):
  upper left:        (2967300.750000, 10149299.250000)
  upper right:       (3250698.750000, 10149299.250000)
  lower left:        (2967300.750000, 10078301.250000)
  lower right:       (3250698.750000, 10078301.250000)
  center:            (3108999.750000, 10113800.250000)

MrSID image info:
  number of levels:  8
  is locked:         false
  file version:      1.0.1.

MrSID/MG2-specific image info:
  is dithered:       false

pogo->


-----Original Message-----
From:	Chris G. Nicholas
Sent:	Thu 7/21/2005 12:05 PM
To:	gdal-dev at lists.maptools.org
Cc:	
Subject:	gdal_translate versus mrsiddecode
Just checked out the latest/greatest CVS snapshot, as well as the same for MrSid DSDK, and not sure why, but mrsiddecode is *_way_* faster for some simple cases; I'm just trying to make thumbnails of some monster images we have sitting around, and doing some simple non-geographic extracts.

Something like:

gdal_translate -of jpeg -outsize 500 500 /data/f04/contentapu1/apu01_2ft_aus_2.sid /tmp/foo.jpg

Input file size is 188933, 47333

goes out to lunch for several minutes. mrsiddecode does the equivalent in under a second. 

Am I doing something wrong?

thanks in advance!
Chris