使用 PHP GD 制作 alpha PNG

发布于 2024-08-27 23:15:46 字数 801 浏览 2 评论 0原文

我在使用 PHP GD 制作 alpha PNG 时遇到问题。我没有 imageMagik 等。

虽然图像在浏览器和 GFX 程序中加载得很好，但我在 Flash AS3 (actionscript) 理解文件时遇到了问题。它抱怨自己是一种未知类型。但是，将这些文件从 Fireworks 导出到相同的规范效果很好。所以我建议 PHP GD 中的格式有问题。

似乎有很多方法可以做到这一点，并且具有一些相似的功能；所以也许这是不对的？

$image_p = imagecreatetruecolor($width_orig, $height_orig);

$image = imagecreatefrompng($filename); 

imagealphablending($image_p, false);
ImageSaveAlpha($image_p, true);
ImageFill($image_p, 0, 0, IMG_COLOR_TRANSPARENT);
imagealphablending($image_p, true);

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width_orig, $height_orig, $width_orig, $height_orig);

imagepng($image_p, "new2/".$filename, 0);

图像销毁($image_p);

这只是获取给定的文件并将它们放入具有指定宽度/高度的新文件中 - 对于此示例，它与原始文件相同，但在生产中它会调整大小，这就是我重新采样的原因。

原文

I've got a problem making alpha PNGs with PHP GD. I don't have imageMagik etc.

Though the images load perfectly well in-browser and in GFX programs, I'm getting problems with Flash AS3 (actionscript) understanding the files. It complains of being an unknown type. But, exporting these files from Fireworks to the same spec works fine. So I'm suggesting it's something wrong with the formatting in PHP GD.

There seems to be a number of ways of doing this, with several similar functions; so maybe this isn't right?

$image_p = imagecreatetruecolor($width_orig, $height_orig);

$image = imagecreatefrompng($filename); 

imagealphablending($image_p, false);
ImageSaveAlpha($image_p, true);
ImageFill($image_p, 0, 0, IMG_COLOR_TRANSPARENT);
imagealphablending($image_p, true);

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width_orig, $height_orig, $width_orig, $height_orig);

imagepng($image_p, "new2/".$filename, 0);

imagedestroy($image_p);

This just takes files it's given and puts them into new files with a specified width/height - for this example it's same as original but in production it resizes, which is why I'm resampling.

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