禁用从画布下载图像 [英] Disable to download image from canvas

问题描述

我将图片添加到canvas元素，但访问者可以将该图片保存到本地comp。
有没有办法禁用该选项？我不知道，把一些透明的图像吗？

I added image to canvas element, but visitor than can save that image to local comp. Is there any way to disable that option? I don't know, putting some transparent image over?

Thx

推荐答案

这一切（甚至不是图像切片）阻止用户简单地将屏幕复制到剪贴板并将其粘贴到MSpaint或任何其他图像实用程序，并保存结果。它的微不足道;透明图像不会阻碍这一点。

None of this (not even image slicing) stops a user from simply copying the screen on to the clipboard and pasting it into MSpaint or any other image utility, and saving the result. Its trivial to do; And a transparency image is no impediment to this.

我知道的唯一有效的选项是（如所说），水印或低质量。
*避免使用Photoshop过滤器轻松删除1像素宽的线条或点水印。

The only effective options that I know of are (as was said), watermarking or low quality. *Avoid 1 pixel wide lines or dot watermarks that can be removed easily with a Photoshop filter.

〜如果它的商业...你可以有一个工资，并且将购买者的姓名和/或信息隐写地嵌入到图像（或预览）中，使得如果未经许可使用它，至少你知道是谁做的。

~If its commercial... You could have a pay-wall, and steganographically embed the purchaser's name and or information into the image (or preview), such that if it does get used without permission, at least you know who did it.

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