Dear friends Could anyone please tell me, In the client server kakadu program, how the client tell a specific compression ratio to server( for example 100:1) ...
Hi Guys, I'm trying to take a 10bit JP2 generated by kakadu and turn it into a 16bit TIFF, using kdu_expand. I've attached the JP2's properties as seen in...
Dear friends, Could anyone please tell me, is kdu_server supprts SSL(secured socket layer)? If it supports SSL, then kindly tell me how can I enable this? ...
Hi Alvin, No I'm afraid it doesn't, but you could always add that. Actually, "kdu_server" was originally intended to be just a demonstration of what kakadu can...
Hi Alvin, It cannot be done. There is no request syntax which demands a certain compression ratio up front. Actually, it is a pretty meaningless thing to ask...
David, after finally getting my Jpip serer working through IIS, I met a problem when connecting to it with kdu_show. In the case of a HTTP POST from kdu_show,...
Description tells for -rate: One or more bit-rates, expressed in terms of the ratio between he total number of compressed bits (including headers) and the...
I find the line: dp->fval = (((float)(*sp)) / 256.0F) - 0.5F; Why do you divide by 256.0f? Would expect division by 255 in order to reach full range [-0.5,...
There are 256 values in a byte (0-255). From: kakadu_jpeg2000@yahoogroups.com [mailto:kakadu_jpeg2000@yahoogroups.com] On Behalf Of ulfknebel Sent: Tuesday,...
Hi, I am looking into using the Kakadu library in a C++ application and have been trying to take baby steps toward understanding how to use the library. I...
Ulf, JPEG2000 allows two modes of wavelet transforms--irreversible and reversible. For irreversible transforms the data is stored in floating point format,...
HI Ben, The ultimate sample code for just about any combination of compression options you can imagine is "kdu_compress". Perhaps that's a bit much for you,...
Hi Ulf, This is a delicate matter. For the purpose of irreversible compression, the way the JPEG2000 standard interprets B-bit imagery, with samples denoted X,...
Hi Ulf, The bit-depth of the original image is completely irrelevant. The definition of "-rate" does not involve the precision of the original image. It is...
Once all lines have been fed into the compression engine(s) the engines still have to finish running (in the multi-threaded mode, this happens in background...
OK, if image dimension is 640*480 -rate 1.0 with one tile means 640*480 bits? bits of what? Sorry, please make parametrisation clearer. Must also give our...
In the kdu_compress example, -rate is in "bits per output pixel". So for a 24-bit RGB image, specifying -rate 1.0 means the output image will be 1/24th of the...
... OK, thing gets clearer. But not clear enough: 24-bit RGB image are passed to kdu in 3 components each having 8-bits. So would -rate 1.0 mean output has...
[] Output size is 1.0 [rate] * (640*480) [image pixels] bits. Because [rate] = [bits per pixel]. There is no dependence on number of components or precision...
So output size for an image with same number of pixels is independent from bit depths and component count? What if I convert 8-bit gray to 24-bit RGB. Images...
Levels seem to indicate sub-division depth of wavelet pyramid. So, when compressing an image, should I always use maximum possible level in order to get full...
David, I am in the process of integrating KakaduV6.0 in our tool-set, including support for Jpip server/clients on the Unix platforms. I can build kdu_server...
Actually if you convert 8-bit gray to 24-bit RGB and compress both with -rate 1.0 the quality should be (nearly) identical because the chrominance components...
Hello Kakadu forum- I have 120 sequential .bmp images and I'd like a Jpeg2000 stream to make a 5 second Digital Cinema clip. Should the .j2c file end up as ...
Hello, read that kdu converts RGB to YUV before compression. When & where does it happen? Where can I deactivate this? Cannot find string YUV in the include...
... In order to equal output-size and input size I multiply the -rate with the bits per pixel and then get something which is almost lossless? I know that the...
You obviously cannot use the same -rate value to get the same "quality" for different bits per per pixel. So don't use -rate at all if you want to have a...
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