png打水印保持透明底
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<?php
//smart_resize_image('cat_002.png', 500, 500, false, 'newfile.png', false);
addImageWatermark('cat_002.png', 'logo2.png', 'newfile.png');
function addImageWatermark($srcImg, $waterImg, $newImgName){
$imgInfo = getimagesize($srcImg);
$winfo = getimagesize($waterImg);
//print_r($srcImg); exit;
$newImgName = empty($newImgName) ? 'newfile.png' : $newImgName;
if ( $imgInfo[2] != IMAGETYPE_PNG ) return false;
$srcImgIm = imagecreatefrompng($srcImg);
//print_r($imgInfo); exit;
/* switch ($imgInfo[2] ) {
case IMAGETYPE_GIF:
$srcImgIm = imagecreatefromgif($imgInfo);
break;
case IMAGETYPE_JPEG:
$srcImgIm = imagecreatefromjpeg($imgInfo);
break;
case IMAGETYPE_PNG:
$srcImgIm = imagecreatefrompng($imgInfo);
break;
default:
return false;
} */
$image_resized = imagecreatetruecolor( $imgInfo[0], $imgInfo[1] );
if ( ($imgInfo[2] == IMAGETYPE_GIF) || ($imgInfo[2] == IMAGETYPE_PNG) ) {
$trnprt_indx = imagecolortransparent($srcImgIm);
// If we have a specific transparent color
if ($trnprt_indx >= 0) {
// Get the original image's transparent color's RGB values
$trnprt_color = imagecolorsforindex($srcImgIm, $trnprt_indx);
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $trnprt_indx);
// Set the background color for new image to transparent
imagecolortransparent($image_resized, $trnprt_indx);
}
// Always make a transparent background color for PNGs that don't have one allocated already
elseif ($imgInfo[2] == IMAGETYPE_PNG) {
// Turn off transparency blending (temporarily)
imagealphablending($image_resized, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $color);
// Restore transparency blending
imagesavealpha($image_resized, true);
}
}
$waterIm = imagecreatefrompng($waterImg);
$waterX = $imgInfo[0] - $winfo[0];
$waterY = $imgInfo[1] - $winfo[1];
imagecopyresampled($image_resized, $srcImgIm, 0, 0, 0, 0, $imgInfo[0], $imgInfo[1], $imgInfo[0], $imgInfo[1]);
//imagecopymerge($image_resized, $waterIm, $waterX, $waterY, 0, 0, 223, 128, 100);
imagecopy($image_resized, $waterIm, $waterX, $waterY, 0, 0, 223, 128);
imagepng($image_resized, $newImgName);
}
/**********上面是简化的函数, 应该还可以简化**********/
function smart_resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true, $use_linux_commands = false )
{
if ( $height <= 0 && $width <= 0 ) {
return false;
}
$info = getimagesize($file);
$image = '';
$final_width = 0;
$final_height = 0;
list($width_old, $height_old) = $info;
if ($proportional) {
if ($width == 0) $factor = $height/$height_old;
elseif ($height == 0) $factor = $width/$width_old;
else $factor = min ( $width / $width_old, $height / $height_old);
$final_width = round ($width_old * $factor);
$final_height = round ($height_old * $factor);
}
else {
$final_width = ( $width <= 0 ) ? $width_old : $width;
$final_height = ( $height <= 0 ) ? $height_old : $height;
}
switch ($info[2] ) {
case IMAGETYPE_GIF:
$image = imagecreatefromgif($file);
break;
case IMAGETYPE_JPEG:
$image = imagecreatefromjpeg($file);
break;
case IMAGETYPE_PNG:
$image = imagecreatefrompng($file);
break;
default:
return false;
}
$image_resized = imagecreatetruecolor( $final_width, $final_height );
if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
$trnprt_indx = imagecolortransparent($image);
// If we have a specific transparent color
if ($trnprt_indx >= 0) {
// Get the original image's transparent color's RGB values
$trnprt_color = imagecolorsforindex($image, $trnprt_indx);
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $trnprt_indx);
// Set the background color for new image to transparent
imagecolortransparent($image_resized, $trnprt_indx);
}
// Always make a transparent background color for PNGs that don't have one allocated already
elseif ($info[2] == IMAGETYPE_PNG) {
// Turn off transparency blending (temporarily)
imagealphablending($image_resized, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $color);
// Restore transparency blending
imagesavealpha($image_resized, true);
}
}
$waterIm = imagecreatefrompng('logo2.png');
imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old);
imagecopymerge($image_resized, $waterIm, 0, 0, 0, 0, 223, 128,100);
if ( $delete_original ) {
if ( $use_linux_commands )
exec('rm '.$file);
else
@unlink($file);
}
switch ( strtolower($output) ) {
case 'browser':
$mime = image_type_to_mime_type($info[2]);
header("Content-type: $mime");
$output = NULL;
break;
case 'file':
$output = $file;
break;
case 'return':
return $image_resized;
break;
default:
break;
}
switch ($info[2] ) {
case IMAGETYPE_GIF:
imagegif($image_resized, $output);
break;
case IMAGETYPE_JPEG:
imagejpeg($image_resized, $output);
break;
case IMAGETYPE_PNG:
imagepng($image_resized, $output);
break;
default:
return false;
}
return true;
}
?>
//smart_resize_image('cat_002.png', 500, 500, false, 'newfile.png', false);
addImageWatermark('cat_002.png', 'logo2.png', 'newfile.png');
function addImageWatermark($srcImg, $waterImg, $newImgName){
$imgInfo = getimagesize($srcImg);
$winfo = getimagesize($waterImg);
//print_r($srcImg); exit;
$newImgName = empty($newImgName) ? 'newfile.png' : $newImgName;
if ( $imgInfo[2] != IMAGETYPE_PNG ) return false;
$srcImgIm = imagecreatefrompng($srcImg);
//print_r($imgInfo); exit;
/* switch ($imgInfo[2] ) {
case IMAGETYPE_GIF:
$srcImgIm = imagecreatefromgif($imgInfo);
break;
case IMAGETYPE_JPEG:
$srcImgIm = imagecreatefromjpeg($imgInfo);
break;
case IMAGETYPE_PNG:
$srcImgIm = imagecreatefrompng($imgInfo);
break;
default:
return false;
} */
$image_resized = imagecreatetruecolor( $imgInfo[0], $imgInfo[1] );
if ( ($imgInfo[2] == IMAGETYPE_GIF) || ($imgInfo[2] == IMAGETYPE_PNG) ) {
$trnprt_indx = imagecolortransparent($srcImgIm);
// If we have a specific transparent color
if ($trnprt_indx >= 0) {
// Get the original image's transparent color's RGB values
$trnprt_color = imagecolorsforindex($srcImgIm, $trnprt_indx);
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $trnprt_indx);
// Set the background color for new image to transparent
imagecolortransparent($image_resized, $trnprt_indx);
}
// Always make a transparent background color for PNGs that don't have one allocated already
elseif ($imgInfo[2] == IMAGETYPE_PNG) {
// Turn off transparency blending (temporarily)
imagealphablending($image_resized, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $color);
// Restore transparency blending
imagesavealpha($image_resized, true);
}
}
$waterIm = imagecreatefrompng($waterImg);
$waterX = $imgInfo[0] - $winfo[0];
$waterY = $imgInfo[1] - $winfo[1];
imagecopyresampled($image_resized, $srcImgIm, 0, 0, 0, 0, $imgInfo[0], $imgInfo[1], $imgInfo[0], $imgInfo[1]);
//imagecopymerge($image_resized, $waterIm, $waterX, $waterY, 0, 0, 223, 128, 100);
imagecopy($image_resized, $waterIm, $waterX, $waterY, 0, 0, 223, 128);
imagepng($image_resized, $newImgName);
}
/**********上面是简化的函数, 应该还可以简化**********/
function smart_resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true, $use_linux_commands = false )
{
if ( $height <= 0 && $width <= 0 ) {
return false;
}
$info = getimagesize($file);
$image = '';
$final_width = 0;
$final_height = 0;
list($width_old, $height_old) = $info;
if ($proportional) {
if ($width == 0) $factor = $height/$height_old;
elseif ($height == 0) $factor = $width/$width_old;
else $factor = min ( $width / $width_old, $height / $height_old);
$final_width = round ($width_old * $factor);
$final_height = round ($height_old * $factor);
}
else {
$final_width = ( $width <= 0 ) ? $width_old : $width;
$final_height = ( $height <= 0 ) ? $height_old : $height;
}
switch ($info[2] ) {
case IMAGETYPE_GIF:
$image = imagecreatefromgif($file);
break;
case IMAGETYPE_JPEG:
$image = imagecreatefromjpeg($file);
break;
case IMAGETYPE_PNG:
$image = imagecreatefrompng($file);
break;
default:
return false;
}
$image_resized = imagecreatetruecolor( $final_width, $final_height );
if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
$trnprt_indx = imagecolortransparent($image);
// If we have a specific transparent color
if ($trnprt_indx >= 0) {
// Get the original image's transparent color's RGB values
$trnprt_color = imagecolorsforindex($image, $trnprt_indx);
// Allocate the same color in the new image resource
$trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $trnprt_indx);
// Set the background color for new image to transparent
imagecolortransparent($image_resized, $trnprt_indx);
}
// Always make a transparent background color for PNGs that don't have one allocated already
elseif ($info[2] == IMAGETYPE_PNG) {
// Turn off transparency blending (temporarily)
imagealphablending($image_resized, false);
// Create a new transparent color for image
$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
// Completely fill the background of the new image with allocated color.
imagefill($image_resized, 0, 0, $color);
// Restore transparency blending
imagesavealpha($image_resized, true);
}
}
$waterIm = imagecreatefrompng('logo2.png');
imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old);
imagecopymerge($image_resized, $waterIm, 0, 0, 0, 0, 223, 128,100);
if ( $delete_original ) {
if ( $use_linux_commands )
exec('rm '.$file);
else
@unlink($file);
}
switch ( strtolower($output) ) {
case 'browser':
$mime = image_type_to_mime_type($info[2]);
header("Content-type: $mime");
$output = NULL;
break;
case 'file':
$output = $file;
break;
case 'return':
return $image_resized;
break;
default:
break;
}
switch ($info[2] ) {
case IMAGETYPE_GIF:
imagegif($image_resized, $output);
break;
case IMAGETYPE_JPEG:
imagejpeg($image_resized, $output);
break;
case IMAGETYPE_PNG:
imagepng($image_resized, $output);
break;
default:
return false;
}
return true;
}
?>
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