APOLLO & ECW/JP2 Discussions

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Posts: 3
Registered: ‎06-26-2019

ECW Output Image Quality ( Actual Compression Rate )



I try to compress a tiff image into ecw v3 containing uint16 bit band. Although I set the target ratio is 1, the actual ratio is too high ( 313 for my case ). When I zoom in, the quality is unacceptable. How can I limit the actual ratio or How can I preserve image quality?


Thak you.

Posts: 377
Registered: ‎11-16-2015

Re: ECW Output Image Quality ( Actual Compression Rate )

[ Edited ]

Hi kkoc,


With ECW, there is no possibility to have a numerically lossless compression. The only way is to produce a JP2 instead.

But, I am quite surprised by your actual compression ratio. What kind of data is it?