diff options
Diffstat (limited to 'converter/other/fitstopnm.c')
-rw-r--r-- | converter/other/fitstopnm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/converter/other/fitstopnm.c b/converter/other/fitstopnm.c index 0a1f899b..181a85ce 100644 --- a/converter/other/fitstopnm.c +++ b/converter/other/fitstopnm.c @@ -468,6 +468,9 @@ scanImageForMinMax(FILE * const ifP, double * const dataminP, double * const datamaxP) { + /* Note that a value in the file might be Not-A-Number. We ignore + such entries in computing the minimum and maximum for the image. + */ double dmax, dmin; unsigned int image; pm_filepos rasterPos; @@ -495,8 +498,9 @@ scanImageForMinMax(FILE * const ifP, double val; readVal(ifP, valFmt, &val); if (image == imagenum || multiplane ) { - dmax = MAX(dmax, val); - dmin = MIN(dmin, val); + /* Note: if 'val' is NaN, result is 2nd operand */ + dmax = MAX(val, dmax); + dmin = MIN(val, dmin); } } } |