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[libpng17] Revised example.c to illustrate use of PNG_DEFAULT_sRGB and

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PNG_GAMMA_MAC_18 as parameters for png_set_gamma().
This commit is contained in:
Glenn Randers-Pehrson
2013-06-25 19:43:16 -05:00
parent 0f1599e6e5
commit 2edcb6ad0f
3 changed files with 14 additions and 8 deletions
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10
example.c
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@@ -2,7 +2,7 @@
#if 0 /* in case someone actually tries to compile this */
/* example.c - an example of using libpng
* Last changed in libpng 1.6.0 [February 14, 2013]
* Last changed in libpng 1.6.3 [(PENDING RELEASE)]
* Maintained 1998-2013 Glenn Randers-Pehrson
* Maintained 1996, 1997 Andreas Dilger)
* Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -441,9 +441,9 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
/* If we don't have another value */
else
{
screen_gamma = 2.2; /* A good guess for a PC monitor in a dimly
lit room */
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */
screen_gamma = PNG_DEFAULT_sRGB; /* A good guess for a PC monitor
in a dimly lit room */
screen_gamma = PNG_GAMMA_MAC_18 or 1.0; /* Good guesses for Mac systems */
}
/* Tell libpng to handle the gamma conversion for you. The final call
@@ -455,7 +455,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
int intent;
if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_gamma(png_ptr, screen_gamma, 0.45455);
png_set_gamma(png_ptr, screen_gamma, PNG_DEFAULT_sRGB);
else
{
double image_gamma;