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PHP?? ???? ???? PNG ?? ??: ?? ???
? ??? ?? PHP ???? PHP?? ???? ???? PNG ??? ???? ???? ??? ??????

PHP?? ???? ???? PNG ??? ???? ???? ??? ??????

Nov 25, 2024 am 05:03 AM

How to Properly Resize PNGs with Transparency in PHP?

PHP?? ???? ???? PNG ?? ??: ?? ???

PHP??? ??? ??? PNG ???? ??? ???? ?? ??? ? ????. ? ??? ????? ??? ?? ??? ??? ??? ?? ???? ??? ??? ?? ?? ? ?? ??? ??? ?????. ???? ? ??? ?? ??? ??? ??? ????.

??? ??:

$this->image = imagecreatefrompng($filename);

imagesavealpha($this->image, true);
$newImage = imagecreatetruecolor($width, $height);

// Make a new transparent image and turn off alpha blending to keep the alpha channel
$background = imagecolorallocatealpha($newImage, 255, 255, 255, 127);
imagecolortransparent($newImage, $background);
imagealphablending($newImage, false);
imagesavealpha($newImage, true);

imagecopyresampled($newImage, $this->image, 0, 0, 0, 0, $width, $height,  $this->getWidth(), $this->getHeight());
$this->image = $newImage;  
imagepng($this->image,$filename);

? ??? ?? ?? ??? ?? imagecolorallocatealpha()? ?? ?? ??? ??? ?? ???????. ?????. ????? ??? ?? ??? ?????. imagecolorallocatealpha()? ???? ?? ?? ?? ??? false? ???? ?? ?? ?? ???? true? ???? ???.

imagesavealpha($newImg, true);
imagealphablending($newImg, false);

? ??? ??? ?? ???? ??? ??? ??? PNG ??? ??? ????? ???? ??? ??? ?? ??? ? ??? ???. ???.

????? 0?? 100 ??? ??? ????:

??? ??? ????? 0?? ??? ????? ?????. ???? ????? 0? 100?? ??? ????? ?????. ? ??? ????? imagecopyresampled()? ?? ????? imagecopyresampled() ??? ???? ???. ??? ???? ???? ??? PNG ???? ? ? ??? ? ?? ?????.

$transparent = imagecolorallocatealpha($newImg, 255, 255, 255, 127);
imagefilledrectangle($newImg, 0, 0, $newWidth, $newHeight, $transparent);
imagecopyresampled($newImg, $image, 0, 0, 0, 0, $newWidth, $newHeight, $src_w, $src_h);

? ??? PHP?? ???? ???? PNG ??? ???? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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? ?? ??? ????? ???? ??? ??????, ???? ?????? ????. ? ???? ?? ???? ?? ??? ?? ????. ???? ??? ???? ???? ??? ?? admin@php.cn?? ?????.

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Undresser.AI Undress

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AI Clothes Remover

AI Clothes Remover

???? ?? ???? ??? AI ?????.

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Video Face Swap

??? ??? AI ?? ?? ??? ???? ?? ???? ??? ?? ????!

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SublimeText3 ??? ??

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