use of Jpeg2000 ?

[Ricaille Tanguy]

Hi,
i have jp2 files in approximately 927*927 pixels in 4 multispectral bands,
coded in 16bits, and i need to provide 500*500 pixels in 3 multispectral
bands, coded in 8 bits, as a quick look for this image.

I try to use gdal_translate -ot Byte -of JPEG -b 1 -b 2 -b 3 test.jp2
test.jpeg, but result is completly black.
I have try ather parameter and it is each time the same result.

Do you have any idee?
Thanks.
Tanguy.

----- Original Message ----- 
From: "Rahkonen Jukka" <Jukka.Rahkonen at MMMTIKE.FI>
To: <MAPSERVER-USERS at LISTS.UMN.EDU>
Sent: Wednesday, February 08, 2006 5:59 PM
Subject: Re: [UMN_MAPSERVER-USERS] use of Jpeg2000 ?


Hi,

If you want to convert jpeg2000 images to other
formats you can use for example gdal_translate
utility. Jpeg2000 images do not behave badly at
all with MapServer, so if that is the final goal
then it might be worth a trial to use them as they
are.

Regards,

-Jukka Rahkonen-
-----Original Message-----
From: UMN MapServer Users List on behalf of Ricaille Tanguy
Sent: Wed 8.2.2006 18:27
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: [UMN_MAPSERVER-USERS] use of Jpeg2000 ?

Hello everybody,
i need to use pictures in jpeg2000 format.

How can i read the content of those files, use it, and save it again under
jpeg, gif, or other formats and compressions levels ?

Great thanks.
Tanguy.