php GD 创建一个透明的png图片
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php GD create a transparent png image
提问by michael
I'm trying to create a transparent png image and layer various other pngs and jpgs to create a final png with transparency. I'm having trouble creating my initial empty transparent png. It currently has a white background.
我正在尝试创建一个透明的 png 图像并将各种其他 png 和 jpg 分层以创建具有透明度的最终 png。我在创建初始空透明 png 时遇到问题。它目前具有白色背景。
Can anyone point me in the right direction. This is my code so far...
任何人都可以指出我正确的方向。到目前为止，这是我的代码...
$image = imagecreatetruecolor(485, 500);
imagealphablending($image, false);
imagesavealpha($image, true);
$col=imagecolorallocatealpha($image,255,255,255,127);
imagefill($image, 0, 0, $col);
//imagefilledrectangle($image,0,0,485, 500,$col);
/* add door glass */
$img_doorGlass = imagecreatefrompng("glass/$doorStyle/$doorGlass.png");
imagecopyresampled($image, $img_doorGlass, 106, 15, 0, 0, 185, 450, 185, 450);
/* add door */
$img_doorStyle = imagecreatefrompng("door/$doorStyle/$doorStyle"."_"."$doorColor.png");
imagecopyresampled($image, $img_doorStyle, 106, 15, 0, 0, 185, 450, 185, 450);
$fn = md5(microtime()."door_builder").".png";
if(imagepng($image, "user_doors/$fn", 1)){
echo "user_doors/$fn";
}
imagedestroy($image);
回答by Lawrence Cherone
Set imagealphablending($image,true);on each new layer.
imagealphablending($image,true);在每个新层上设置。
Try this:
尝试这个：
<?php
$image = imagecreatetruecolor(485, 500);
imagealphablending($image, false);
$col=imagecolorallocatealpha($image,255,255,255,127);
imagefilledrectangle($image,0,0,485, 500,$col);
imagealphablending($image,true);
/* add door glass */
$img_doorGlass = imagecreatefrompng("glass/$doorStyle/$doorGlass.png");
imagecopyresampled($image, $img_doorGlass, 106, 15, 0, 0, 185, 450, 185, 450);
imagealphablending($image,true);
/* add door */
$img_doorStyle = imagecreatefrompng("door/$doorStyle/$doorStyle"."_"."$doorColor.png");
imagecopyresampled($image, $img_doorStyle, 106, 15, 0, 0, 185, 450, 185, 450);
imagealphablending($image,true);
$fn = md5(microtime()."door_builder").".png";
imagealphablending($image,false);
imagesavealpha($image,true);
if(imagepng($image, "user_doors/$fn", 1)){
echo "user_doors/$fn";
}
imagedestroy($image);
?>
回答by ishubin
This code worked for me:
这段代码对我有用：
$img=imagecreatetruecolor(180,20);
imagealphablending($img,false);
$col=imagecolorallocatealpha($img,255,255,255,127);
imagefilledrectangle($img,0,0,180,20,$col);
imagealphablending($img,true);
$font=$_SERVER["DOCUMENT_ROOT"].'/fonts/Arial.ttf';
$color = imagecolorallocate($img, 140, 173, 209);
imagettftext($img,11,0,5,14,$color,$font,'Text goes here');
header('Content-Type: image/png');
imagealphablending($img,false);
imagesavealpha($img,true);
imagepng($img);
回答by OZ_
Try to replace$col=imagecolorallocatealpha($image,255,255,255,127);
with$col=imagecolorallocate($image,255,255,255);
尝试替换$col=imagecolorallocatealpha($image,255,255,255,127);
为$col=imagecolorallocate($image,255,255,255);
and try to uncomment imagefilledrectangleline.
I can test this code - give me the pictures :)
并尝试取消注释imagefilledrectangle行。
我可以测试这个代码 - 给我图片:)
