网络浏览器中的图像有点模糊。如何解决呢？ [英] Images in web browser are blurred a bit. How to fix it?

问题描述

我在玩游戏。这个游戏中的碰撞是基于画布上的像素的颜色。我得到彩色像素，如果它是例如红色，玩家不能移动。
不幸的是在firefox图像远程模糊。像素流利地从白色变为红色。但我不想要。

任何想法如何回答这个问题？

解决方案

这被称为抗锯齿，是重新调整大小（或子像素化形状，文本等）时对图像进行插值的结果向前）。

不过，您可以在浏览器的最新版本中关闭此功能。

这是我做的一个测试，看看这是否在您的浏览器和模式之间的差异（如下图） - 底部版本不应该平滑：

（含状态未准备好实施）指定 crisp-edges 而不是 optimize-contrast 作为未来的标准。上面的CSS类更新为以反映这个非前缀值。

- 结束更新

对于webkit浏览器，您可以像这样禁用canvas元素的图像平滑：

  context.webkitImageSmoothingEnabled = false; 
  

和Mozilla：

  context.mozImageSmoothingEnabled = false; 
 

（当后者可用时，CSS类不是必需的，除非您缩放元素本身，应避免这种情况）。

I'm making a game. Collisions in this game are based on color of pixel on canvas. I get color pixel and if it is for example red, player can't move. Unfortunately in firefox images are remotely blurred. Pixels are fluently changed from white color to red. But I don't want that. Any ideas how to answer to this problem?

解决方案

This is called anti-aliasing and is a result of interpolating the image when re-sized (or sub-pixeling shapes, text and so forth). It's something the browser do internally.

You can however turn off this in more recent version of the browser.

Here is a test I made to see if this works in your browser and the difference between the modes (as in the picture below) - the bottom version should not be smoothed:

ONLINE TEST

Add this snippet to your CSS style sheet (may or may not work depending on browser):

canvas {
    image-rendering: optimizeSpeed;             // Older versions of FF
    image-rendering: -moz-crisp-edges;          // FF 6.0+
    image-rendering: -webkit-optimize-contrast; // Webkit (non standard naming)
    image-rendering: -o-crisp-edges;            // OS X & Windows Opera (12.02+)
    image-rendering: crisp-edges;               // Possible future browsers.
    -ms-interpolation-mode: nearest-neighbor;   // IE (non standard naming)
}

Update: The current form of the standard (with status "not ready for implementation") specify crisp-edges and not optimize-contrast as possible future standard. CSS class above is updated with this to reflect this for the non-prefixed value.
- end update -

For webkit browsers you can disable image smoothing for the canvas element like this:

context.webkitImageSmoothingEnabled = false;

and for Mozilla:

context.mozImageSmoothingEnabled = false;

(when this latter is available the CSS class is not necessary unless you scale the element itself which in any case should be avoided).

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