Changeset 17660 for trunk/psLib/src/fits/psFitsScale.h

Timestamp:

May 13, 2008, 3:27:25 PM (18 years ago)

Author:

Paul Price

Message:

Some fixes to image I/O: (1) when BITPIX=8, the FITS standard says unsigned ints (cf two's complement for BITPIX=16,32,64). Added some special cases for quantising to BITPIX=8 to accomodate this. (2) Adding support for marking bad pixels when doing compression. Out-of-range and non-finite pixels are written with value 2^{(BITPIX-1)-1, which is recovered (to NAN) when reading (through use of (Z)BLANK keyword). Added test for this. It doesn't pass yet --- the highest pixel in the image is being interpreted as NAN when it shouldn't be. Solution probably involves tweaking scaleRange() in psFitsScale.c, but not worrying about that now.}

File:

• trunk/psLib/src/fits/psFitsScale.h (modified) (1 diff)

trunk/psLib/src/fits/psFitsScale.h

@@ -10 +10 @@
 bool psFitsScaleDetermine(double *bscale, ///< Scaling, to return
                           double *bzero, ///< Zero point, to return
+                          long *blank,  ///< Blank value, to return
                           const psImage *image, ///< Image to scale
                           const psFits *fits ///< FITS options