Bringing the blur back into focus...

  Isn't it annoying when you take a set of photos, and many of them come back blurred? It's one of the most common PRoblems photographers have, but one of the hardest to correct after the photograph has been taken!
  This tutorial will show you how to repair photo blur, and how to avoid it in the future.

  The Basic Principle

  If you've used photoshop or Photoshop Elements for a while now, you may have noticed two terms that walk hand in hand. 'Blurring' and 'Sharpening'.
  如果你现在使用的是Photoshop 或 Photoshop Elements,你会注意到两个项目在一起——“模糊”和“锐化”。
  Basically, sharpening an image is the opposite of blurring it. Photoshop Elements provides many different ways to sharpen an image.
  一般说来,锐化图像是和模糊图像相反的过程。Photoshop Elements 提供了很多不同的方法来锐化一张图片。
  To start with there's the 'Sharpen Tool', found near the bottom of your tool palette. This allows you to sharpen just a certain area of a picture, using an appropriate brush shape and size.
  If you're sharpening the whole image, you can use the filters in the 'Sharpen' category under the 'Filter' menu. These include 'Sharpen', 'Sharpen More', and 'Sharpen Edges'.
  Additionally to all of that, if you like to correct photos in 'Quick Fix' mode, there is a sharpen slider available in that section for you to use.

  A 'Quick' Example

  Shown further down is a portion of a photograph I took which exhibited minor blur. This is a correctable level of blur, and so I opened the photo in Photoshop Elements, and switched into 'Quick Fix' mode, using the button shown below:
  下面展示的是我拍的有轻微模糊的部分照片(此句翻译不准确,不知道如何翻),这在模糊的修复的范围内,所以我在Photoshop Elements中打开照片,然后切换至快速修复模式,使用如下图所示的按钮:


  I always like to see the before and after picture in quick fix mode, and so I changed my view accordingly.
  To do this, use the drop down box in the bottom left hand corner, and select 'Before and After (Portrait)', as shown below:
  要做到这一点,使用左手边的下拉菜单,选择Before and After (Portrait),如下图所示:


  The 'Sharpen' slider is the furthest one down on the right hand side by default. By dragging it around two thirds of the way along, I was able to reduce the blurring effect on my photo. Shown below is the photo before and after sharpening:



  Unfortunately, sharpening is a rather in-exact art, and carries a danger with it. Because of the way it works, it is all-too-easy to 'over-sharpen' an image, causing very unattractive results.
  不幸的是,锐化是一个相对不确切的艺术,同时它也带来一定的危险,因为它的工作方式,很容易对图像过度锐化,导致相当不好的效果。This is especially common when using the sharpen tool on a high strength setting. Below is shown an image which demonstrates the effect of over-sharpening:


  To avoid over-sharpening, use the sharpen tools on low intensities, and only where they are needed.

  Severe Blurring

  In cases where images are extremely blurred, it is often impossible to repair them effectively.
  Below is shown an image, with some close-up sections, which is blurred to the point of no return:


  There is very little you can do to correct images like this, but there is a lot you can do to avoid them!

  Camera Shake

  The photo above was taken from a moving vehicle. To avoid blurring, photos should always be taken when the camera is stationary.
  If you find (like me!) that your hands shake when you are taking photos, find something to rest the camera on. Ideally this would be a tripod, but if there is not one available, look for walls or other surfaces.
  当你发现拍照是你的手在抖动找一些能固定相机的东西,理想的应该是三脚架,但是没有三脚架可用时,寻找墙壁或其他表面。If no surface is available, try leaning up again something, or putting your elbows by your side, to steady your arms and reduce camera-shake.

  Shutter Speed

  Another way to reduce blurring is to increase the shutter speed of your camera. If your camera allows you to manually set the shutter speed, it is useful to remember that on high shutter speeds, blurring is usually dramatically reduced.
  Unfortunately the reverse is also true. Using slow shutter speeds, perhaps to compensate for bad light, blur is dramatically increased. Ensure that the camera is perfectly still on low shutter speeds.

  Bad Light

  Apart from shutter speed, photos are usually more prone to blurring in bad light anyway. If you are taking photos inside, ensure you use a Flash if light is fading. When outside, the best tactic is once again a perfectly still camera.

  If in Doubt...

  If you are struggling to take a particular image, the only other advice I can offer is to take lots of pictures! On a digital camera there can be a reasonably large variation between repeat shots. The more pictures you take, the more chance you stand of getting at least one good one!

  Other Photo Repair Techniques

  If you are interested in learning about how to repair other forms of photographic damage, such as faded color or rips and blemishes, why not read my main tutorial on Restoring Photos.
  如果你对如何修复其他照片损伤感兴趣,像偏色,裂痕和污点,为何不看看我的在Restoring Photos上的教程呢。

  As you can see, especially around the text on the sign, the blur has been reduced by sharpening the image.