Question

我已尽我所能解决这个问题。我花了一个多小时研究和尝试代码，但没有任何帮助。

此代码执行以下操作。

拍摄两张全白图像并重新着色（保持透明度）
合并两张图片
输出图像（但带黑色背景!!）

有人可以帮助识别和修补导致黑色背景的部分吗？有关脚本的示例，请参阅以下URL。

http://labs.bluefiremedia.net/metro-machine/gd/download-png.php?size=128&padding=29&icon=icons/Application/Add-New.png&bgShape=CircleBG.png&bgColorR=255&bgColorG=0&bgColorB=0&iconColorR=255&iconColorG=255&iconColorB=255

$final_image = imagecreatetruecolor($dimensions, $dimensions);
imagesavealpha($final_image, true);

if($bgShape != '') {
list($originalWidth, $originalHeight) = getimagesize('../images/' . $bgShape);

$background = imagecreatefrompng('../images/' . $bgShape);

imagefilter($background, IMG_FILTER_BRIGHTNESS, -255);
imagefilter($background, IMG_FILTER_COLORIZE, $bgColorR, $bgColorG, $bgColorB);

$backgroundImage = imagecreatetruecolor( $dimensions, $dimensions );
imagealphablending($backgroundImage , false);
imagesavealpha($backgroundImage , true);

imagecopyresampled($backgroundImage,
    $background,
    0, 0,
    0, 0,
    $dimensions, $dimensions,
    $originalWidth, $originalHeight
);

imagecopy($final_image, $backgroundImage, 0, 0, 0, 0, $dimensions, $dimensions);

///

$icon = imagecreatefrompng("../" . $icon);

imagefilter($icon, IMG_FILTER_BRIGHTNESS, -255);
imagefilter($icon, IMG_FILTER_COLORIZE, $iconColorR, $iconColorG, $iconColorB);

$iconImage = imagecreatetruecolor( $dimensions, $dimensions );
imagealphablending($iconImage , false);
imagesavealpha($iconImage , true);

imagecopyresampled($iconImage,
    $icon,
    0, 0,
    0, 0,
    $dimensions, $dimensions,
    $originalWidth, $originalHeight
);

imagecopy($final_image, $iconImage, 0, 0, 0, 0, $dimensions, $dimensions);

///

imagealphablending($final_image, true);
imagesavealpha($final_image, true);

imagepng($final_image, NULL, 0, PNG_NO_FILTER);

header("Content-type: image/png");
imagedestroy($backgroundImage);

Answer 1

将imagealphablending设置为false，用透明色填充图像，将imagealphablending设置为true，然后复制内容。

$final_image = imagecreatetruecolor($dimensions, $dimensions);
imagealphablending($final_image, false);
$transparency = imagecolorallocatealpha($final_image,  0, 0, 0, 127);
imagefilledrectangle($final_image, 0, 0, $dimensions, $dimensions, $transparency);
imagesavealpha($final_image, true);
imagealphablending($final_image, true);

// rest of the code

背景变黑了

1 个答案: