Detailed Description
Description
- ISO/IEC 15444 (2000, 2003)
http://www.jpeg.org/
- You must link the application with "im_jp2.lib" and you must call the function imFormatRegisterJP2 once to register the format into the IM core library. In Lua call require"imlua_jp2".
- Access to the JPEG2000 file format uses libJasper version 2.0.14
https://www.ece.uvic.ca/~frodo/jasper/
Copyright (c) 2001-2016 Michael David Adams.
- See im_format_jp2.h
Features
Data Types: Byte and UShort
Color Spaces: Binary, Gray, RGB, YCbCr, Lab and XYZ
Compressions:
JPEG-2000 - ISO JPEG 2000 [default]
Only one image.
Can have an alpha channel.
Internally the components are always unpacked.
Internally the lines are arranged from top down to bottom.
Handle(1) returns jas_image_t*
Handle(2) returns jas_stream_t*
Attributes:
CompressionRatio IM_FLOAT (1) [write only, example: Ratio=7 just like 7:1]
Comments:
We read code stream syntax and JP2, but we write always as JP2.
Used definitions EXCLUDE_JPG_SUPPORT,EXCLUDE_MIF_SUPPORT,
EXCLUDE_PNM_SUPPORT,EXCLUDE_RAS_SUPPORT,
EXCLUDE_BMP_SUPPORT,EXCLUDE_PGX_SUPPORT
Changed jas_config.h to match our needs.
New file jas_binfile.c
Changed base/jas_stream.c to export jas_stream_create and jas_stream_initbuf.
The counter is for memory transfer only.
These changes can be ignored when using an external libJasper distribution,
but in this case the imBinFile global features will not work.
Function Documentation
| void imFormatRegisterJP2 |
( |
void |
|
) |
|
Register the JP2 Format.
In Lua, when using require"imlua_jp2" this function will be automatically called.
