JFITSConv

JFITSConv is a TIFF to FITS image converter compliant with the UNI 11845:2022 standard.
JFITSConv handles several original TIFF tags by mapping them with specific FITS keywords as described in the Appendix of the UNI 11845:2022 document.

License

JFITSConv is released under the GNU General Public License version 3.0. See LICENSE file for details.

Requirements

JFITSConv uses the nom.tam.fits library available here. The library must be modified because of the fixed position of the EXTEND keyword in the FITS header. The UNI 11845:2022 standard establishes that the EXTEND keyword must be placed after the UNIKEY keyword and the UNIKEY keyword must be placed immediately after the last NAXISn keyword.
To compile the source codes you need to use Java 14 or above versions.

Notes

Since the FITS standard version 3.0 the EXTEND keyword is no longer in fixed position after NAXISn.
It seems that the latest nom.tam.fits version (1.16.1) has a misoutput when managing zero float values (the library writes a zero value as "0.E0" instead of "0.0") so we recommend to use the 1.15.2 version and correct handling of the EXTEND keyword as described below.
The converter supports 24 bit color images only.

The EXTEND keyword fix

To free the positioning of EXTEND keyword you need to modify the class HeaderOrder by commenting the source code from line 116 as follows (nom.tam.fits version 1.15.2):

        /*
        if (c1.equals(EXTEND.key())) {
            return -1;
        } else if (c2.equals(EXTEND.key())) {
            return 1;
        } else
        */

After making this fix, compile and create a new jar file that you will use in conjunction with JFITSConv.

Usage

To show the command-line usage just start JFITSConv without parameters.
The current version of JFITSConv uses two parameters: the original TIFF image filename and the output FITS filename.

JFITSConv tiff_filename fits_filename

Example:

java -cp "nom-tam-fits.jar;JFITSConv.jar" org.dbseret.fits.JFITSConv image.tif image.fit

See also

The UNI 11845:2022 standard documentation is available at uni.com.