[Gdal-dev] RE: Urgent help needed with image conversion for the JimGray search

[Ethan Alpert]

Sean, 

 

gdal_translate -ot Byte -of JPEG -scale 0 2048 0 255 source.tif
output.jpg

 

BTW, I looked at the imagery you received and it is clouds over water
it's going to be very difficult to look for features with such a large
dynamic range in the imagery. You would be better off using PCI or ENVI
or some tool that allows you to tweak the color histogram better than a
linear scale.

 

-e

 

________________________________

From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Forde, Sean
Sent: Friday, February 02, 2007 10:45 AM
To: gdal-dev at lists.maptools.org
Subject: [Gdal-dev] RE: Urgent help needed with image conversion for the
JimGray search

 

Friends - can I use gdal_translate to convert 11bit geotiff to jpeg? Can
you tell me the command line arguments?

________________________________

From: owner-software at amazon.com [mailto:owner-software at amazon.com] On
Behalf Of Vogels, Werner
Sent: Friday, February 02, 2007 8:50 AM
To: software at amazon.com
Cc: turk-jim-gray at amazon.com
Subject: Urgent help needed with image conversion for the Jim Gray
search

As you guys may know computer science icon Jim Gray disappeared at sea
last Sunday, and the Coast Guard has not been able to find any trace. It
is a complete mystery.

 

We have started an effort to find him by getting access to satellite
data with the intention to load it into Mechanical Turk, the turk team
has worked deep into the night to make this happen. 

 

We have however hit an obstacle to which we have no answer: the image
format is 16 bit panchromatic with on 11 bits used for data (tiff). If
you view this in a regular viewer it will be pitch black. We'll need to
run a conversion similar to what is described here:

 

http://www.eurimage.com/products/qb_photoshop/photoshop.html

 

to get the images into a spectrum that is usable.

 

Does any of you know of any automated tools or procedures that can make
this happen?

 

Some of the images can be found at: internal/~deflaux/JimGray

 

--
Werner

<http://openphi.net/tenacious/> 

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