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[libpng15] 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().  These have been available
since libpng-1.5.4.
This commit is contained in:
Glenn Randers-Pehrson 2013-06-25 18:50:55 -05:00
parent fb8831d19a
commit 67859c8fcb
3 changed files with 14 additions and 8 deletions
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9
ANNOUNCE
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@ -1,5 +1,5 @@
Libpng 1.5.17rc03 - June 18, 2013 Libpng 1.5.17rc03 - June 25, 2013
This is not intended to be a public release. It will be replaced This is not intended to be a public release. It will be replaced
within a few weeks by a public version or by another test version. within a few weeks by a public version or by another test version.
@ -49,13 +49,16 @@ Version 1.5.17beta01 [June 8, 2013]
the confusion that would result by declaring the init function even when the confusion that would result by declaring the init function even when
it is not used, so that it will always get prefixed. it is not used, so that it will always get prefixed.
Version 1.5.17rc01 [June 18, 2013] Version 1.5.17rc01 [June 25, 2013]
No changes. No changes.
Version 1.5.17rc02 [June 18, 2013] Version 1.5.17rc02 [June 18, 2013]
Revised libpng.3 so that "doclifter" can process it. Revised libpng.3 so that "doclifter" can process it.
Version 1.5.17rc03 [June 18, 2013] Version 1.5.17rc03 [June 25, 2013]
Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
as parameters for png_set_gamma(). These have been available since
libpng-1.5.4.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

5
CHANGES
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@ -4142,7 +4142,10 @@ Version 1.5.17rc01 [June 17, 2013]
Version 1.5.17rc02 [June 18, 2013] Version 1.5.17rc02 [June 18, 2013]
Revised libpng.3 so that "doclifter" can process it. Revised libpng.3 so that "doclifter" can process it.
Version 1.5.17rc03 [June 18, 2013] Version 1.5.17rc03 [June 25, 2013]
Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
as parameters for png_set_gamma(). These have been available since
libpng-1.5.4.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit (subscription required; visit

8
example.c
View File

@ -259,9 +259,9 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
/* If we don't have another value */ /* If we don't have another value */
else else
{ {
screen_gamma = 2.2; /* A good guess for a PC monitor in a dimly screen_gamma = PNG_DEFAULT_sRGB; /* A good guess for a PC monitor
lit room */ in a dimly lit room */
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */ 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 /* Tell libpng to handle the gamma conversion for you. The final call
@ -273,7 +273,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
int intent; int intent;
if (png_get_sRGB(png_ptr, info_ptr, &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 else
{ {
double image_gamma; double image_gamma;