使用画布从图像中删除像素？
我可以使用画布按颜色从图像中删除像素，使该区域透明吗？
如果是这样...
我可以使用其他服务器上托管的图像来执行此操作吗？
在服务器端做这个会更好吗？ https://github.com/LearnBoost/node-canvas
谢谢！
Can I remove pixels from an image by color using canvas, making that area transparent?
If so...
Can I do this with images hosted on other servers?
Would it be better to do this server-side? https://github.com/LearnBoost/node-canvas
Thanks!
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
此处已完成此操作：https://developer.mozilla。 org/en-US/docs/Web/API/Canvas_API/Manipulated_video_using_canvas
它有一个活生生的例子，看起来效果很好。我建议你检查一下。
This has been done here: https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Manipulating_video_using_canvas
It has a live example which seems to work nicely. I recommend you check it out.
正如其他人所说，这是可能的，Dessus 的链接将对此有所帮助。
但是，出于安全原因，您将无法对其他服务器上托管的图像执行此操作。如果您将远程图像写入画布，它会将画布视为“受污染”，并会通过 JavaScript 安全异常进行处理。因此，您只能对与执行操作的代码位于同一服务器上的图像执行此操作。
As others have said, this is possible and Dessus' link will help with that.
However you won't be able to do this with images hosted on other servers for security reasons. If you write a remote image to canvas, it treats the canvas as "tainted" and will through a JavaScript security exeption. So you'll only be able to do it on images that are on the same server as the code that performs the manipulation.
像素操作
检查上面的链接。这些文章讨论了如何操作画布中的像素。关于显示来自跨域服务器的图像，您不能使用canvas来执行此操作，您将得到安全异常。要从其他服务器加载图像，您可以使用自己的服务器作为代理，在您的服务器上调用具有完整图像路径的方法，您的服务器应该从其他服务器下载图像并将其发送回给您。这样您就可以显示来自其他域的图像。
Pixel Manipulation
check the above link. The articles discusses how you can manipulate pixels in a canvas. About displaying images from cross domain server, you cannot do so using canvas, you will get a security exception. To load the images from other server you can use your own server as a proxy, call a method at your server with complete image path and your server should download it image from other server and send it back to you. This way you can show the images from other domains.