如何删除图像中的透明颜色？

发布于 2024-09-15 05:40:30 字数 359 浏览 3 评论 0原文

使用 php 将 gif 和 png 图像中的透明颜色替换为白色的最佳方法是什么？

// get transparent color indexes
$trsp = ImageColorsForIndex($image, ImageColorTransparent($image));
// get transparent color set
$delete = imagecolorallocate($image, $trsp['red'], $trsp['green'], $trsp['blue']); 
// replace
imagecolorset($image, $delete, 255, 255, 255);

不工作。

原文

What is the best way to replace transparent colors with white in gif and png images with php?

// get transparent color indexes
$trsp = ImageColorsForIndex($image, ImageColorTransparent($image));
// get transparent color set
$delete = imagecolorallocate($image, $trsp['red'], $trsp['green'], $trsp['blue']); 
// replace
imagecolorset($image, $delete, 255, 255, 255);

does not working.

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傾旎 2024-09-22 05:40:30

我其实不太用 GD - 我更喜欢 ImageMagick。以下方法有效，但我不确定它是否是最有效的：

// Get the original image.
$src = imagecreatefrompng('trans.png');

// Get the width and height.
$width = imagesx($src);
$height = imagesy($src);

// Create a white background, the same size as the original.
$bg = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($bg, 255, 255, 255);
imagefill($bg, 0, 0, $white);

// Merge the two images.
imagecopyresampled(
    $bg, $src,
    0, 0, 0, 0,
    $width, $height,
    $width, $height);

// Save the finished image.
imagepng($bg, 'merged.png', 0);

I don't really use GD all that much - I prefer ImageMagick. The following method works, but I'm not sure if it is the most efficient:

// Get the original image.
$src = imagecreatefrompng('trans.png');

// Get the width and height.
$width = imagesx($src);
$height = imagesy($src);

// Create a white background, the same size as the original.
$bg = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($bg, 255, 255, 255);
imagefill($bg, 0, 0, $white);

// Merge the two images.
imagecopyresampled(
    $bg, $src,
    0, 0, 0, 0,
    $width, $height,
    $width, $height);

// Save the finished image.
imagepng($bg, 'merged.png', 0);

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