我正在为一个项目开发自定义头像系统,但我从未涉及过 PHP 的图像方面。我猜我需要以某种方式使用 GD,但我不知道从哪里开始。
基本上,有很多预制的透明 PNG 图像。用户可以选择其中 2-3 个来自定义他们的头像,我希望能够将这些图像组合成一个单独的图像并存储在文件夹中。
基本上,有很多预制的透明 PNG 图像。用户可以选择其中 2-3 个来自定义他们的头像,我希望能够将这些图像组合成一个单独的图像并存储在文件夹中。
$image_1 = imagecreatefrompng('image_1.png');
$image_2 = imagecreatefrompng('image_2.png');
imagealphablending($image_1, true);
imagesavealpha($image_1, true);
imagecopy($image_1, $image_2, 0, 0, 0, 0, 100, 100);
imagepng($image_1, 'image_3.png');
这让我从另外三个PNG文件中创建了一个PNG图像,以创建带有背景的水印图像。希望对其他人有所帮助。
$bgFile = __DIR__ . "/background-layer-1.png"; // 93 x 93
$imageFile = __DIR__ . "/icon-layer-2.png"; // 76 x 76
$watermarkFile = __DIR__ . "/stars-layer-3.png"; // 133 x 133
(是白色星星)
<?php
// Download the image files if we don't have them
function get_file($file, $from) {
if (!file_exists(__DIR__ . "/" . $file)) { file_put_contents(__DIR__ . "/" . $file, file_get_contents($from)); }
}
get_file("background-layer-1.png", "http://i.imgur.com/6pgf3WK.png");
get_file("icon-layer-2.png", "http://i.imgur.com/0sJt52z.png");
get_file("stars-layer-3.png", "http://i.imgur.com/1Tvlokk.png");
$bgFile = __DIR__ . "/background-layer-1.png"; // 93 x 93
$imageFile = __DIR__ . "/icon-layer-2.png"; // 76 x 76
$watermarkFile = __DIR__ . "/stars-layer-3.png"; // 133 x 133
// We want our final image to be 76x76 size
$x = $y = 76;
// dimensions of the final image
$final_img = imagecreatetruecolor($x, $y);
// Create our image resources from the files
$image_1 = imagecreatefrompng($bgFile);
$image_2 = imagecreatefrompng($imageFile);
$image_3 = imagecreatefrompng($watermarkFile);
// Enable blend mode and save full alpha channel
imagealphablending($final_img, true);
imagesavealpha($final_img, true);
// Copy our image onto our $final_img
imagecopy($final_img, $image_1, 0, 0, 0, 0, $x, $y);
imagecopy($final_img, $image_2, 0, 0, 0, 0, $x, $y);
imagecopy($final_img, $image_3, 0, 0, 0, 0, $x, $y);
ob_start();
imagepng($final_img);
$watermarkedImg = ob_get_contents(); // Capture the output
ob_end_clean(); // Clear the output buffer
header('Content-Type: image/png');
echo $watermarkedImg; // outputs: `http://i.imgur.com/f7UWKA8.png`
输出:
$base = imagecreatefrompng('your base image path');
//logo is transparent: in this case stackoverflow logo
$logo = imagecreatefrompng("path for image with transparent background");
//Adjust paramerters according to your image
imagecopymerge_alpha($base, $logo, 60, 60, 0, 0, 300, 200, 100);
header('Content-Type: image/png');
imagepng($base);
//@see: http://php.net/manual/en/function.imagecopymerge.php for below function in first comment
function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){
// creating a cut resource
$cut = imagecreatetruecolor($src_w, $src_h);
// copying relevant section from background to the cut resource
imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);
// copying relevant section from watermark to the cut resource
imagecopy($cut, $src_im, 0, 0, $src_x, $src_y, $src_w, $src_h);
// insert cut resource to destination image
imagecopymerge($dst_im, $cut, $dst_x, $dst_y, 0, 0, $src_w, $src_h, $pct);
}
一定要使用GD库。
<?php
$final_img = imagecreate($x, $y); // where x and y are the dimensions of the final image
$image_1 = imagecreatefrompng('image_1.png');
$image_2 = imagecreatefrompng('image_2.png');
$image_3 = imagecreatefrompng('image_3.png');
imagecopy($image_1, $final_img, 0, 0, 0, 0, $x, $y);
imagecopy($image_2, $final_img, 0, 0, 0, 0, $x, $y);
imagecopy($image_3, $final_img, 0, 0, 0, 0, $x, $y);
imagealphablending($final_img, false);
imagesavealpha($final_img, true);
if($output_to_browser){
header('Content-Type: image/png');
imagepng($final_img);
}else{
// output to file
imagepng($final_img, 'final_img.png');
}
?>
imagecopy
之前和之后使用各种组合的imagealphablending
和imagesavealpha
,但令人惊讶的是,这个方法是有效的。 :) - yitwail