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J2KIMG: Conversion between JPEG2000 and IMG or JPEG raster formats
Direct access to online help: J2KIMG
Access the application from the menu:
"File | Import | Rasters | JPEG2000 -> IMG, JPG, RGB"
"File | Export | IMG, JPG, RGB, MrSID, ECW -> JPEG2000"
Presentation and options
This application allows you to obtain the information of the internal metadata of the JPEG2000 format, to import a JPEG2000 to a JPEG format (grey or RGB, depending on the JPEG2000 file) or to extract between one and three IMG bands of a JPEG2000.Thereby, depending on your interest the program allows you to execute different options:
When the JPEG2000 images have been compressed without loss, it can have sense to recover the images as IMG files to analyse them, although these file might need much more disc space than the original images, and if the images need more than 2 Gbyte for spectral band it could be impossible to convert. So, the application has the following options:
Metadata:
Shows the metadata of the JPEG2000 file.
JPEG:
This generates 1 JPEG file from a JPEG2000 image
IMG:
This generates 1 IMG file from a grey JPEG2000 file
IMG MULTI:
This generates 3 IMG files from a 24 bit JPEG2000 file.
N IMG:
Generates n files IMG from a JPEG2000 file.
JPEG2000 from a JPEG file:
Generate a JPEG2000 file from a JPEG file.
JPEG2000 from 1 IMG file:
Generate a Grey JPEG2000 file from 1 IMG file.
A 24 bits JPEG2000 from 3 IMG files:
Generates a 24 bits JPEG2000 from 3 IMG files.
JPEG2000 MULTI:
Generates a multiband JPEG2000 file from n IMG files.
REL:
Generates a JPEG2000 file from a REL file.
SID:
JPEG2000 file from a SID file.
ECW:
Generate a JPEG2000 file from an ECW file.
The JPEG2000 files are rasters highly compressed thanks to the use of transformed wavelet. JPEG2000 uses typically degrading compression (it also named unconservative, with loss, or lossy), for being the one that more strongly compresses the image; despite this unconserving character, the images usually have a visual aspect very similar to the original ones, unless they have been generated at compression levels extremely raised; this is an important difference with regard to the JPEG conventional format, which starts presenting visual gadgetry at minor levels of compression. On the other hand, the JPEG format can also compress in an efficient way even without degrading the values of the original image (conserving compression, without loss, or lossless), even if in this case the levels of compression are not so high.
Dialog box of the application
Syntax:
J2KIMG 0 JPEG2000FilName
J2KIMG 1 JPEG2000FileName JPEGFileName
J2KIMG 2 JPEG2000FileName IMGFileName
J2KIMG 3 JPEG2000FileName IMG_RFileName IMG_GFileName IMG_BFileName
- Option
- 0: This shows the internal metainformation of the JPEG2000
file
- 1: This generates 1 JPEG file from a JPEG2000 image
- 2: This generates 1 IMG file from a grey JPEG2000 file
- 3: This generates 3 IMG files from a 24 bit JPEG2000 file
- JPEG2000FileName is the name of the JPEG2000 file to
transform.
- JPEGFileName is the name of the JPEG file resulted from the
transformation.
- IMGFileName is the name of the IMG file resulted from the
transformation of a JPEG2000 gray channel.
- IMG_#NameFile it is the name of the IMG file resulted from
the transformation of each RGB band.
- /QUALITAT= Quality of the compression in a range [0,100],
where [5,95] is the useful range although in many cases a value will be
between 70 and 75 (75 automatically). The low values indicate very few
quality but great compression.
- /FWORLD= It generates a world file of the stated extension.
It is possible to indicate /FWORLD to generate it using the extension
automatically.
