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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2019-01-20 19:23:11 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2019-01-20 19:23:11 +0000 |
| commit | 4b8daa32342e426270aca945853934e8e25f0af1 (patch) | |
| tree | 5a9f25739cc003e45a7a5ef8dfbd47c7f8c63c92 /lib/pgm.h | |
| parent | 6d06b8e0c26536edaedf04ae56849667b85c1325 (diff) | |
| download | netpbm-mirror-4b8daa32342e426270aca945853934e8e25f0af1.tar.gz netpbm-mirror-4b8daa32342e426270aca945853934e8e25f0af1.tar.xz netpbm-mirror-4b8daa32342e426270aca945853934e8e25f0af1.zip | |
Fix handling of floating point imprecision in unnormalizing samples
git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@3514 9d0c8265-081b-0410-96cb-a4ca84ce46f8
Diffstat (limited to 'lib/pgm.h')
| -rw-r--r-- | lib/pgm.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/pgm.h b/lib/pgm.h index 81e86cfb..d4655239 100644 --- a/lib/pgm.h +++ b/lib/pgm.h @@ -42,6 +42,8 @@ typedef unsigned int gray; #define PGM_OVERALLMAXVAL 65535 #define PGM_MAXMAXVAL 255 +#define pgm_unnormalize(value, maxval) \ + ((gray)((value + 1e-6) * (maxval) + 0.5)) /* Magic constants. */ |