| Re: what is an efficient lossless compression way to store a gray-scale image [message #36255] |
Wed, 27 August 2003 10:36 |
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Stein Vidar Hagfors H[2]
Messages: 28
Registered: October 2002
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Junior Member |
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Jonathan Boswell <jsb@ost.cdrh.fda.gov> writes:
> Julia wrote:
>> seems that there is no way to store gray-scale images in IDL
>> efficiently...
>
> I believe GIF is lossless if you have fewer than 256 "colors". What version of
> IDL do you have? There are licensing issues pertaining to the LZW compression
> used by the GIF standard, and recent versions of IDL will not run WRITE_GIF w/o
> additional expense.
>
See WRITE_PNG - 2D arrays work with or without a palette, on 8 or 16
bits per channel.
--
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Stein Vidar Hagfors Haugan
ESA SOHO SOC/European Space Agency Science Operations Coordinator for SOHO
NASA Goddard Space Flight Center, Tel.: 1-301-286-9028
Mail Code 682.3, Bld. 26, Room G-1, Cell: 1-240-354-6066
Greenbelt, Maryland 20771, USA. Fax: 1-301-286-0264
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