Legacy ImageMagick Discussions Archive

Hi,

I want to convert to JP2 and have the following required specs:

Quality levels/layers:
Multiple quality levels/layers, highest quality should be lossless. 16 levels/layers. After lossless, 4 bits/pixel, 2 bits/pixel, and so on down to 0.015625 bits/pixel.

I can set this using the ilyrrates parameter right? What would be the array of values that I would use to satisfy the requirements above?

Thanks in advance.

JP2 (JPG2000) is currently handled by the Jasper delegate library. To get your desired functionality, you may need to use the Jasper delegate itself outside of IM.

See
http://www.imagemagick.org/script/jp2.php
http://www.ece.uvic.ca/~frodo/jasper/

Thanks for the reply.

I'm fairly new to the JP2 format and I was trying to understand the requirements that I mentioned above and try to map it out in the JP2 options in ImageMagick. I already saw that links before I posted, but it does not offer any information that would help me understand the requirements.

Quality levels/layers:
Multiple quality levels/layers, highest quality should be lossless. 16 levels/layers. After lossless, 4 bits/pixel, 2 bits/pixel, and so on down to 0.015625 bits/pixel.

As I understand this, it says that there should have 16 layers with the rates going from lossless to 0.015625. So in using the ilyrrates options in ImageMagick, I need 16 rate values, representing the 16 layers, which goes from 0.015625 bits/pixel to 4 bits/pixel. Is this correct?

Now, how do I get the rest of the values?

TIA

Wish I could help, but I do not use JP2 enough. I just normally use the default. I am not really knowledgeable in its parameterization. Perhaps someone else might be able to help who uses Jasper more than I.