替换图像颜色并保持 100% Alpha 背景

发布于 2024-10-31 14:42:21 字数 725 浏览 0 评论 0原文

我有一个透明背景的 png。前景是单色的。我想在保留 100% Alpha 背景的同时更改此单色。

下面的代码不起作用，当我有 gif 时它起作用了。然而，当我将 gif 更改为 png 然后添加 alpha 内容时，颜色更改失败了。

如果我添加 imagetruecolortopalette($im, false, 255); 颜色会改变，但 alpha 会丢失。

有人可以告诉我哪里出错了请

$imgname = "block.png";
$im = imagecreatefrompng($imgname);
imagealphablending($im, false); 

$index = imagecolorclosest ($im, 153,153,153); // get Grey COlor
imagecolorset($im,$index,0,0,0); // SET NEW COLOR

imageAlphaBlending($im, true);
imageSaveAlpha($im, true);
$imgname = "result.png";
imagepng($im, $imgname ); // save image as gif
imagedestroy($im);

编辑::这是一个足够简单的脚本。

当我使用 gif 时，颜色发生了变化并保存了新图像。当 a 更改为 .png 时。颜色不再改变，因此原始图像通过脚本时没有变化。

原文

I have a png with a transparent background. The foreground is a single color. I want to change this single color while preserving the 100% alpha background.

The code below doesn't work, it worked when I had a gif. However, when I changed the gif to a png then added the alpha stuff the color change broke down.

If I add imagetruecolortopalette($im, false, 255); the color is changed but alpha is lost.

Can someone show me where I am going wrong please

$imgname = "block.png";
$im = imagecreatefrompng($imgname);
imagealphablending($im, false); 

$index = imagecolorclosest ($im, 153,153,153); // get Grey COlor
imagecolorset($im,$index,0,0,0); // SET NEW COLOR

imageAlphaBlending($im, true);
imageSaveAlpha($im, true);
$imgname = "result.png";
imagepng($im, $imgname ); // save image as gif
imagedestroy($im);

EDIT :: This is a simple enough script.

When I used a gif, the color changed and the new image was saved. When a changed to a .png. The color no longer changed and thus the original image passes through the script unchanged.

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