imagepng
Output a PNG image to either the browser or a file
Description
bool imagepng(
GdImage $image
,
resourcestringnull $file
= null
,
int $quality
= -1,
int $filters
= -1
)
Parameters
-
image
-
A GdImage object, returned by one of the image creation functions,
such as imagecreatetruecolor.
-
file
-
The path or an open stream resource (which is automatically closed after this function returns) to save the file to. If not set or null
, the raw image stream will be output directly.
Note:
null
is invalid if the quality
and
filters
arguments are not used.
-
quality
-
Compression level: from 0 (no compression) to 9.
The default (-1
) uses the zlib compression default.
For more information see the » zlib manual.
-
filters
-
Allows reducing the PNG file size. It is a bitmask field which may be
set to any combination of the PNG_FILTER_*
constants. PNG_NO_FILTER
or
PNG_ALL_FILTERS
may also be used to respectively
disable or activate all filters.
The default value (-1
) disables filtering.
Caution
The filters
parameter is ignored by system libgd.
Return Values
Returns true
on success or false
on failure.
CautionHowever, if libgd fails to output the image, this function returns true
.
Errors/Exceptions
Throws a ValueError if quality
is invalid.
See Also
- imagegif
- imagewbmp
- imagejpeg
- imagetypes
- imagesavealpha