PHP - 使用图像生成透明度（或不透明度）渐变 [英] PHP - Generate transparency (or opacity) gradient using image

问题描述

使用PHP可以拍摄现有图像并生成副本，其中原始图像从100％不透明变为0％不透明（或0％透明变为100％透明！）？

Using PHP is it possible to take an existing image and produce a copy where the original image changes from 100% opaque to 0% opaque (or 0% transparent to 100% transparent!)?

谢谢，

Toby

编辑：我意识到我的问题不清楚，道歉。我想拍摄一张图片并在其上创建不透明度渐变，因此图像顶部是100％不透明，底部是100％透明，中间是半透明。

I realise my question was unclear, apologies. I want to take an image and create an opacity gradient across it, so the image is 100% opaque at the top, 100% transparent at the bottom and translucent in between.

推荐答案

好吧，如果你把图像从100％变为0％，它会消失吗？和0％到100％意味着它是透明的，所以它变黑了？我不确定你要问的是尝试本教程

Well if you take an image from 100% to 0%, it disappears right ? and 0% to 100% means it was transparent so it went black? I'm not sure exactly what you are asking bu try this tutorial

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