Dear Kakadu users, I have been experimenting with the Motion JPEG 2000 component of kakadu 3.2, and am trying to compress a sequence of images. I have written...
George Beckett
george@...
May 1, 2002 10:30 am
114
The problem is if I use our system to read the picture data and compress it by Kakadu, the color will chang from RED ->Blue, GREEN stays green, Blue will...
Hi, David: I only used part of your program to compress my picture. The question is as following: 1) I found that our system change the data from RGB to BGR, ...
Hi, The change from BGR to RGB (or any other combination for that matter) is trivial. It does not need any extra code, or arrays, memory or run-time ...
Hi, The problem is that we got the data into the memory already. I can't change the data order when I read it because we use BGR for all the processing. I am...
Hi, ... David can probably tell that. But in any case, even if you hold images in memory, you should still be able to do the trick I told u... all you are...
If I don't do anything, the color change a lot. I need to do 2 steps. If I do only one step, it doesn't work. 1)I added an array to change the data from BGR to...
In order to implement alpha channels (referred to as opacity channels in the Taubman & Marcellin text), a JP2 file would need to have a channel definition box....
Hi George, Looks like there was a stupid bug in "kdu_v_compress" that reads the first frame and discards it before starting up -- must have left a couple of...
I really don't know what you mean by "use kakadu". As mentioned, there is pretty much nothing in Kakadu which assumes an order for the colour components. There...
My guess, although you are not saying so, is that you are using the "simple_examle" program as your base for understanding Kakadu. It reads in a PPM file (RGB...
HI Steve, You are right about using the channel definition box. You just indicate to the Kakadu initialization functions for that box which components you...
... We use the word opacity because the term alpha is used for both opacity and transparency (is code value 0 fully transparent or fully opaque?). In JP2,...
David, Thank you for response. However, as I do not have a licence for the kakadu software and am only using the demostration apps., would it be possible...
David, I am trying to build kdu_jni.dll from the jni_source.dsw in java\jni_source. The compilers is complaining about being unable to find jni_md.h. I have...
Hi Joe, "jni_md.h" is part of Sun's standard Java SDK. It is a platform dependent include file included from the main "jni.h" header. You just need to...
Hi Joe, There is no problem. The 1 is required by the Java native function naming convention. Underscores in the Java function name become _1 escape sequences...
I have updated the Win32 executables, downloadable from the links at http://www.kakadusoftware.com. Cheers, David ... David Taubman Senior Lecturer, School of...
Hello, Appreciate if anyone can shed some light on the following question. We are looking into posibility of converting all common image formats found on the...
Hi Jim, This is not a Kakadu problem per se, it is a question of code-stream organization. The set_max_bytes function simply truncates the code-stream when...
For compressing graphics and line art with a small palette of different colours, I would probably recommend that you compress the indices into the colour...
We often work with irregularly bounded images, sometimes even having interior holes. The invalid pixels (outside the "boundary") are usually represented by a...
Hi Michael, There is nothing to explicitly take care of the "null" pixels in the way you desire. I understand your concern, which is not so much that bits get...
Dear Sirs, please allow me a question regarding "metadata" generation based on jp2 or jpx code streams. Are there tools available that take jp2 or jpx code...
This is a follow-up to the question that was previously asked about gif to jpeg2000 conversion. Your answer, David was very helphful and the parameters you...
Hi Philippe, Regrettably, this is a problem you are stuck with. Kakadu's BMP processor automatically rearranges the colour map in an attempt to improve...
Dear Kakadu community, I don't get it to convert a RAW-file (720x576, 8bpp) to a proper JP2. There must be an unconscious difference between the way I...
