diff options
Diffstat (limited to 'lib/libpamn.c')
-rw-r--r-- | lib/libpamn.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/lib/libpamn.c b/lib/libpamn.c index 8ae57037..ae28283a 100644 --- a/lib/libpamn.c +++ b/lib/libpamn.c @@ -414,6 +414,19 @@ pnm_writepamn(struct pam * const pamP, +samplen +pnm_normalized_sample(struct pam * const pamP, + sample const sample) { + return (samplen)sample/pamP->maxval; +} + +sample +pnm_unnormalized_sample(struct pam * const pamP, + samplen const sampleVal) { + double const epsilon = 1e-6; + return (sample)((sampleVal + epsilon) * pamP->maxval + 0.5); +} + void pnm_normalizetuple(struct pam * const pamP, tuple const tuple, @@ -422,7 +435,7 @@ pnm_normalizetuple(struct pam * const pamP, unsigned int plane; for (plane = 0; plane < pamP->depth; ++plane) - tuplen[plane] = (samplen)tuple[plane] / pamP->maxval; + tuplen[plane] = pnm_normalized_sample(pamP, tuple[plane]); } @@ -435,7 +448,7 @@ pnm_unnormalizetuple(struct pam * const pamP, unsigned int plane; for (plane = 0; plane < pamP->depth; ++plane) - tuple[plane] = tuplen[plane] * pamP->maxval + 0.5; + tuple[plane] = pnm_unnormalized_sample(pamP, tuplen[plane]); } |