imagegammacorrect
Description
The imagegammacorrect of Image for PHP apply a gamma correction to a GD image.
Syntax
imagegammacorrect(
GdImage $image,
float $input_gamma,
float $output_gamma
): boolParameters
image
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
input_gamma
The input gamma.
output_gamma
The output gamma.
Return
Returns true on success or false on failure.
Examples
1 · return
<? $width = 100; $height = 100; $image = imagecreate($width, $height); $input_gamma = 1.0; $output_gamma = 1.5; $return = imagegammacorrect($image, $input_gamma, $output_gamma); var_export($return); ?>
true
2 · base64
<?
$filename = $_SERVER['DOCUMENT_ROOT'] . '/assets/gif/1.gif';
$image = imagecreatefromgif($filename);
$input_gamma = 1.0;
$output_gamma = 1.5;
imagegammacorrect($image, $input_gamma, $output_gamma);
ob_start();
imagegif($image);
$output = ob_get_clean();
echo '<!doctype html>
<html>
<body>
<img src="data:image/gif;base64,' . base64_encode($output) . '">
</body>
</html>';
?><!doctype html>
<html>
<body>
<img src="data:image/gif;base64,R0lGODdhZABkAIAAABAKEAAAACwAAAAAZABkAAACc4SPqcvtD6OctNqLs968+w+G4kiW5omm6sq27gvH8kzX9o3n+s73/g8MCofEovGITCqXzKbzCY1Kp9Sq9YrNarfcrvcLDovH5LL5jE6r1+y2+w2Py+f0uv2Oz+v3/L7/DxgoOEhYaHiImKi4yNjo+AhpWAAAOw==">
</body>
</html>Links
Image
- gd_info
- getimagesize
- getimagesizefromstring
- image_type_to_extension
- image_type_to_mime_type
- imageaffine
- imageaffinematrixconcat
- imageaffinematrixget
- imagealphablending
- imageantialias
- imagearc
- imageavif
- imagebmp
- imagechar
- imagecharup
- imagecolorallocate
- imagecolorallocatealpha
- imagecolorat
- imagecolorclosest
- imagecolorclosestalpha
- imagecolorclosesthwb
- imagecolordeallocate
- imagecolorexact
- imagecolorexactalpha
- imagecolormatch
- imagecolorresolve
- imagecolorresolvealpha
- imagecolorset
- imagecolorsforindex
- imagecolorstotal
- imagecolortransparent
- imageconvolution
- imagecopy
- imagecopymerge
- imagecopymergegray
- imagecopyresampled
- imagecopyresized
- imagecreate
- imagecreatefromavif
- imagecreatefrombmp
- imagecreatefromgif
- imagecreatefromjpeg
- imagecreatefrompng
- imagecreatefromstring
- imagecreatefromtga
- imagecreatefromwbmp
- imagecreatefromwebp
- imagecreatefromxbm
- imagecreatefromxpm
- imagecreatetruecolor
- imagecrop
- imagecropauto
- imagedashedline
- imagedestroy
- imageellipse
- imagefill
- imagefilledarc
- imagefilledellipse
- imagefilledpolygon
- imagefilledrectangle
- imagefilltoborder
- imagefilter
- imageflip
- imagefontheight
- imagefontwidth
- imageftbbox
- imagefttext
- imagegetclip
- imagegetinterpolation
- imagegif
- imageinterlace
- imageistruecolor
- imagejpeg
- imagelayereffect
- imageline
- imageloadfont
- imageopenpolygon
- imagepalettecopy
- imagepalettetotruecolor
- imagepng
- imagepolygon
- imagerectangle
- imageresolution
- imagerotate
- imagesavealpha
- imagescale
- imagesetbrush
- imagesetclip
- imagesetinterpolation
- imagesetpixel
- imagesetstyle
- imagesetthickness
- imagesettile
- imagestring
- imagestringup
- imagesx
- imagesy
- imagetruecolortopalette
- imagettfbbox
- imagettftext
- imagetypes
- imagewbmp
- imagewebp
- imagexbm
- iptcembed
- iptcparse
