如何在 php 中创建具有模糊图像背景的图像
How create image with a blur image background in php
我正在尝试使用 php 创建一张 4:3 图像，其中包含用户上传的任何图像。无论图像原始大小如何，我都想用同一图像的模糊副本填充背景。
这是我使用的代码（来自 István Ujj-Mészáros）：
function resize($source_image, $destination, $tn_w, $tn_h, $quality = 90) {
$info = getimagesize($source_image);
$imgtype = image_type_to_mime_type($info[2]);
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$source = imagecreatefromjpeg($source_image);
break;
case 'image/gif':
$source = imagecreatefromgif($source_image);
break;
case 'image/png':
$source = imagecreatefrompng($source_image);
break;
default:
die('Invalid image type.');
}
#Figure out the dimensions of the image and the dimensions of the desired thumbnail
$src_w = imagesx($source);
$src_h = imagesy($source);
#Do some math to figure out which way we'll need to crop the image
#to get it proportional to the new size, then crop or adjust as needed
$x_ratio = $tn_w / $src_w;
$y_ratio = $tn_h / $src_h;
if (($src_w <= $tn_w) && ($src_h <= $tn_h)) {
$new_w = $src_w;
$new_h = $src_h;
} elseif (($x_ratio * $src_h) < $tn_h) {
$new_h = ceil($x_ratio * $src_h);
$new_w = $tn_w;
} else {
$new_w = ceil($y_ratio * $src_w);
$new_h = $tn_h;
}
$newpic = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
$final = imagecreatetruecolor($tn_w, $tn_h);
// This code fill with green color
//$backgroundColor = imagecolorallocate($final, 0, 255, 0);
//imagefill($final, 0, 0, $backgroundColor);
imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h);
// This code generates a blurred image
# ****************************************************
//for ($x=1; $x <=2; $x++){
// imagefilter($final, IMG_FILTER_GAUSSIAN_BLUR, 999);
//}
//imagefilter($final, IMG_FILTER_SMOOTH,99);
//imagefilter($final, IMG_FILTER_BRIGHTNESS, 10);
# ****************************************************
if (imagejpeg($final, $destination, $quality)) {
return true;
}
return false;
}
// targetFilePath contains the folder an filename
resize($targetFilePath,$targetFilePath,640,480,90);
结果就像这张图：
my result until now
我需要什么？
The result that i hope
欢迎任何想法。
提前致谢！！！
有很多方法，但我建议您使用 imagecopymerge 而不是 imagecopy。您提供目的地和源坐标 以及源大小 瞧！
但是请注意，这样您将无法保持透明度（对于 GIF/PNG，如果存在）。为此，请查看 PHP 文档中 Sina Salek 的评论：PNG ALPHA CHANNEL SUPPORT for imagecopymerge()。
但我同意@LeeKowalkowski 的观点 - 从长远来看 运行，你应该考虑迁移到 ImageMagick，原因有很多 - 最重要的是图像质量。
编辑：我忘了提到，在合并之前，用 imagecolortransparent 设置透明颜色（扩展的 canvas）。然后，Sina Salek在PHP文档中的评论（上面的link）。
好的，我做了我的工作并研究了更多关于 php 图像命令的信息。我写了一个非常有效的解决方案。
<?php
$image = "01.jpg";
image_web($image, 700, 525); // I need final images 700x525 (4:3)
echo '<img src="00.jpg"/>';
function image_web($image, $width, $height){ // Get the image source and the final desire dimensions
$info = getimagesize($image);
//$mimetype = $info['mime']; // other way to get mimetype
$mimetype = image_type_to_mime_type($info[2]);
$allowTypes = array('image/jpeg','image/png','image/gif');
if(in_array($mimetype, $allowTypes)){
switch ($mimetype) {
case 'image/jpeg':
$image = imagecreatefromjpeg($image);
break;
case 'image/gif':
$image = imagecreatefromgif($image);
break;
case 'image/png':
$image = imagecreatefrompng($image);
break;
default:
die('Invalid image type.');
}
} else {
echo 'Is not a image';
}
$image2 = $image; // Save a copy to be used for front image
$wor = imagesx($image); // Get original image width
$hor = imagesy($image); // Get original image height
if ($hor >= $wor){ // If is vertical*******************************************************************************************************
if ($wor >= $width){ // If image source is bigger than final desire dimensions
$hcenter = ($hor/2)-($height/2); // center image source in height
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $wor, $hor, $wor, $hor);
} else { // If image source is not bigger than final desire dimensions
$hcenter = ($hor/2)-($height/2); // center image source in height
$hnu = ($hor*$width)/$wor;
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $width, $hnu, $wor, $hor);
}
} else { // If is portrait rectangular****************************************************************************************************
$ratio = $wor/$hor;
if($ratio > 1.3333333){ // If is portrait larger than 4:3
$wnu = ($wor*$height)/$hor;
$wcenter = ($wnu/2)-($width/2); // center image in width
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, -$wcenter, 0, 0, 0, $wnu, $height, $wor, $hor);
} else { // If portrait is not larger than 4:3
$hnu = ($wor*$height)/$hor;
$hcenter = ($hnu/2)-($height/2); // center image source in height
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $width, $hnu, $wor, $hor);
}
}
// Blur Image
for ($x=1; $x <=40; $x++){
imagefilter($back, IMG_FILTER_GAUSSIAN_BLUR, 999);
}
imagefilter($back, IMG_FILTER_SMOOTH,99);
imagefilter($back, IMG_FILTER_BRIGHTNESS, 10);
// Getting the dimensions of the image
$src_w = imagesx($image2);
$src_h = imagesy($image2);
// Do some math to figure out which way we'll need to crop the image
// to get it proportional to the new size, then crop or adjust as needed
$x_ratio = $width / $src_w;
$y_ratio = $height / $src_h;
if (($src_w <= $width) && ($src_h <= $height)) {
$new_w = $src_w;
$new_h = $src_h;
} elseif (($x_ratio * $src_h) < $height) {
$new_h = ceil($x_ratio * $src_h);
$new_w = $width;
} else {
$new_w = ceil($y_ratio * $src_w);
$new_h = $height;
}
$front = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($front, $image2, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
if ($new_h >= $new_w){ // If is vertical image
$wctr = ($new_w/2)-($width/2);
imagecopymerge($back, $front,-$wctr, 0, 0, 0, $new_w, $new_h, 100);
} else { // if is portrait
$hctr = ($new_h/2)-($height/2);
imagecopymerge($back, $front,0, -$hctr, 0, 0, $new_w, $new_h, 100);
}
// output new file
imagejpeg($back,'00.jpg',90);
imagedestroy($back);
imagedestroy($front);
//*********************************************************************************
/**
Do other actions like send ajax responses, save in database, etc
**/
}
?>
我增强了@mhuenchul 代码，现在无论图像大小如何，它都可以工作。
function image_blurred_bg($image, $dest, $width, $height){
try{
$info = getimagesize($image);
} catch (Exception $e){
return false;
}
$mimetype = image_type_to_mime_type($info[2]);
switch ($mimetype) {
case 'image/jpeg':
$image = imagecreatefromjpeg($image);
break;
case 'image/gif':
$image = imagecreatefromgif($image);
break;
case 'image/png':
$image = imagecreatefrompng($image);
break;
default:
return false;
}
$wor = imagesx($image);
$hor = imagesy($image);
$back = imagecreatetruecolor($width, $height);
$maxfact = max($width/$wor, $height/$hor);
$new_w = $wor*$maxfact;
$new_h = $hor*$maxfact;
imagecopyresampled($back, $image, -(($new_w-$width)/2), -(($new_h-$height)/2), 0, 0, $new_w, $new_h, $wor, $hor);
// Blur Image
for ($x=1; $x <=40; $x++){
imagefilter($back, IMG_FILTER_GAUSSIAN_BLUR, 999);
}
imagefilter($back, IMG_FILTER_SMOOTH,99);
imagefilter($back, IMG_FILTER_BRIGHTNESS, 10);
$minfact = min($width/$wor, $height/$hor);
$new_w = $wor*$minfact;
$new_h = $hor*$minfact;
$front = imagecreatetruecolor($new_w, $new_h);
imagecopyresampled($front, $image, 0, 0, 0, 0, $new_w, $new_h, $wor, $hor);
imagecopymerge($back, $front,-(($new_w-$width)/2), -(($new_h-$height)/2), 0, 0, $new_w, $new_h, 100);
// output new file
imagejpeg($back,$dest,90);
imagedestroy($back);
imagedestroy($front);
return true;
}
我正在尝试使用 php 创建一张 4:3 图像，其中包含用户上传的任何图像。无论图像原始大小如何，我都想用同一图像的模糊副本填充背景。
这是我使用的代码（来自 István Ujj-Mészáros）：
function resize($source_image, $destination, $tn_w, $tn_h, $quality = 90) {
$info = getimagesize($source_image);
$imgtype = image_type_to_mime_type($info[2]);
#assuming the mime type is correct
switch ($imgtype) {
case 'image/jpeg':
$source = imagecreatefromjpeg($source_image);
break;
case 'image/gif':
$source = imagecreatefromgif($source_image);
break;
case 'image/png':
$source = imagecreatefrompng($source_image);
break;
default:
die('Invalid image type.');
}
#Figure out the dimensions of the image and the dimensions of the desired thumbnail
$src_w = imagesx($source);
$src_h = imagesy($source);
#Do some math to figure out which way we'll need to crop the image
#to get it proportional to the new size, then crop or adjust as needed
$x_ratio = $tn_w / $src_w;
$y_ratio = $tn_h / $src_h;
if (($src_w <= $tn_w) && ($src_h <= $tn_h)) {
$new_w = $src_w;
$new_h = $src_h;
} elseif (($x_ratio * $src_h) < $tn_h) {
$new_h = ceil($x_ratio * $src_h);
$new_w = $tn_w;
} else {
$new_w = ceil($y_ratio * $src_w);
$new_h = $tn_h;
}
$newpic = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($newpic, $source, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
$final = imagecreatetruecolor($tn_w, $tn_h);
// This code fill with green color
//$backgroundColor = imagecolorallocate($final, 0, 255, 0);
//imagefill($final, 0, 0, $backgroundColor);
imagecopy($final, $newpic, (($tn_w - $new_w)/ 2), (($tn_h - $new_h) / 2), 0, 0, $new_w, $new_h);
// This code generates a blurred image
# ****************************************************
//for ($x=1; $x <=2; $x++){
// imagefilter($final, IMG_FILTER_GAUSSIAN_BLUR, 999);
//}
//imagefilter($final, IMG_FILTER_SMOOTH,99);
//imagefilter($final, IMG_FILTER_BRIGHTNESS, 10);
# ****************************************************
if (imagejpeg($final, $destination, $quality)) {
return true;
}
return false;
}
// targetFilePath contains the folder an filename
resize($targetFilePath,$targetFilePath,640,480,90);
结果就像这张图： my result until now
我需要什么？ The result that i hope
欢迎任何想法。 提前致谢！！！
有很多方法，但我建议您使用 imagecopymerge 而不是 imagecopy。您提供目的地和源坐标 以及源大小 瞧！
但是请注意，这样您将无法保持透明度（对于 GIF/PNG，如果存在）。为此，请查看 PHP 文档中 Sina Salek 的评论：PNG ALPHA CHANNEL SUPPORT for imagecopymerge()。
但我同意@LeeKowalkowski 的观点 - 从长远来看 运行，你应该考虑迁移到 ImageMagick，原因有很多 - 最重要的是图像质量。
编辑：我忘了提到，在合并之前，用 imagecolortransparent 设置透明颜色（扩展的 canvas）。然后，Sina Salek在PHP文档中的评论（上面的link）。
好的，我做了我的工作并研究了更多关于 php 图像命令的信息。我写了一个非常有效的解决方案。
<?php
$image = "01.jpg";
image_web($image, 700, 525); // I need final images 700x525 (4:3)
echo '<img src="00.jpg"/>';
function image_web($image, $width, $height){ // Get the image source and the final desire dimensions
$info = getimagesize($image);
//$mimetype = $info['mime']; // other way to get mimetype
$mimetype = image_type_to_mime_type($info[2]);
$allowTypes = array('image/jpeg','image/png','image/gif');
if(in_array($mimetype, $allowTypes)){
switch ($mimetype) {
case 'image/jpeg':
$image = imagecreatefromjpeg($image);
break;
case 'image/gif':
$image = imagecreatefromgif($image);
break;
case 'image/png':
$image = imagecreatefrompng($image);
break;
default:
die('Invalid image type.');
}
} else {
echo 'Is not a image';
}
$image2 = $image; // Save a copy to be used for front image
$wor = imagesx($image); // Get original image width
$hor = imagesy($image); // Get original image height
if ($hor >= $wor){ // If is vertical*******************************************************************************************************
if ($wor >= $width){ // If image source is bigger than final desire dimensions
$hcenter = ($hor/2)-($height/2); // center image source in height
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $wor, $hor, $wor, $hor);
} else { // If image source is not bigger than final desire dimensions
$hcenter = ($hor/2)-($height/2); // center image source in height
$hnu = ($hor*$width)/$wor;
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $width, $hnu, $wor, $hor);
}
} else { // If is portrait rectangular****************************************************************************************************
$ratio = $wor/$hor;
if($ratio > 1.3333333){ // If is portrait larger than 4:3
$wnu = ($wor*$height)/$hor;
$wcenter = ($wnu/2)-($width/2); // center image in width
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, -$wcenter, 0, 0, 0, $wnu, $height, $wor, $hor);
} else { // If portrait is not larger than 4:3
$hnu = ($wor*$height)/$hor;
$hcenter = ($hnu/2)-($height/2); // center image source in height
$back = imagecreatetruecolor(round($width), round($height));
imagecopyresampled($back, $image, 0, -$hcenter, 0, 0, $width, $hnu, $wor, $hor);
}
}
// Blur Image
for ($x=1; $x <=40; $x++){
imagefilter($back, IMG_FILTER_GAUSSIAN_BLUR, 999);
}
imagefilter($back, IMG_FILTER_SMOOTH,99);
imagefilter($back, IMG_FILTER_BRIGHTNESS, 10);
// Getting the dimensions of the image
$src_w = imagesx($image2);
$src_h = imagesy($image2);
// Do some math to figure out which way we'll need to crop the image
// to get it proportional to the new size, then crop or adjust as needed
$x_ratio = $width / $src_w;
$y_ratio = $height / $src_h;
if (($src_w <= $width) && ($src_h <= $height)) {
$new_w = $src_w;
$new_h = $src_h;
} elseif (($x_ratio * $src_h) < $height) {
$new_h = ceil($x_ratio * $src_h);
$new_w = $width;
} else {
$new_w = ceil($y_ratio * $src_w);
$new_h = $height;
}
$front = imagecreatetruecolor(round($new_w), round($new_h));
imagecopyresampled($front, $image2, 0, 0, 0, 0, $new_w, $new_h, $src_w, $src_h);
if ($new_h >= $new_w){ // If is vertical image
$wctr = ($new_w/2)-($width/2);
imagecopymerge($back, $front,-$wctr, 0, 0, 0, $new_w, $new_h, 100);
} else { // if is portrait
$hctr = ($new_h/2)-($height/2);
imagecopymerge($back, $front,0, -$hctr, 0, 0, $new_w, $new_h, 100);
}
// output new file
imagejpeg($back,'00.jpg',90);
imagedestroy($back);
imagedestroy($front);
//*********************************************************************************
/**
Do other actions like send ajax responses, save in database, etc
**/
}
?>
我增强了@mhuenchul 代码，现在无论图像大小如何，它都可以工作。
function image_blurred_bg($image, $dest, $width, $height){
try{
$info = getimagesize($image);
} catch (Exception $e){
return false;
}
$mimetype = image_type_to_mime_type($info[2]);
switch ($mimetype) {
case 'image/jpeg':
$image = imagecreatefromjpeg($image);
break;
case 'image/gif':
$image = imagecreatefromgif($image);
break;
case 'image/png':
$image = imagecreatefrompng($image);
break;
default:
return false;
}
$wor = imagesx($image);
$hor = imagesy($image);
$back = imagecreatetruecolor($width, $height);
$maxfact = max($width/$wor, $height/$hor);
$new_w = $wor*$maxfact;
$new_h = $hor*$maxfact;
imagecopyresampled($back, $image, -(($new_w-$width)/2), -(($new_h-$height)/2), 0, 0, $new_w, $new_h, $wor, $hor);
// Blur Image
for ($x=1; $x <=40; $x++){
imagefilter($back, IMG_FILTER_GAUSSIAN_BLUR, 999);
}
imagefilter($back, IMG_FILTER_SMOOTH,99);
imagefilter($back, IMG_FILTER_BRIGHTNESS, 10);
$minfact = min($width/$wor, $height/$hor);
$new_w = $wor*$minfact;
$new_h = $hor*$minfact;
$front = imagecreatetruecolor($new_w, $new_h);
imagecopyresampled($front, $image, 0, 0, 0, 0, $new_w, $new_h, $wor, $hor);
imagecopymerge($back, $front,-(($new_w-$width)/2), -(($new_h-$height)/2), 0, 0, $new_w, $new_h, 100);
// output new file
imagejpeg($back,$dest,90);
imagedestroy($back);
imagedestroy($front);
return true;
}