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Alright we have just two more analytical exercises looking at the Blur functions here inside Photoshop and both of these exercises are going to be covering Blur Filters that convey a sense of movement inside of an image. First we will look at the Motion Blur Filter inside this exercise and in the next exercise we will look at the Radial Blur Filter which allows you to spin and zoom an image as we will see. Alright so go to Layers palette and make sure that 4BR is selected and this should be an unmodified rectangle so far.
This is the lower right layer inside the document. And then I am going to go up to the Filter Menu I am going to choose Blur and I am going to choose this guy right here Motion Blur. You may recall the Motion Blur setting that was available to us inside the smart sharpen dialog box based on the exact same technology. So it turns out pretty simply filter. I am going to go ahead and take the angle value up to a much higher value than we have been using in the past. I am going to take it to a 100 and right now it's scrubbing back and forth at an angle of 0 degrees. You can change that if you want to by changing this angle setting either by dragging this little line here or by modifying the value itself in anyway that you see fit and you can see how it not only blurs the image but it also blurs the transparency mask.
So that we are changing the boundaries of the layer and if we didn't want to do that we could turn on that lock transparency function inside the Layers palette as I showed you way back in the first exercise of this chapter. Alright so that's all that the Motion Blur function is about. Now notice I am going to go ahead and click on the OK button. Notice that it's a bidirectional effect meaning that you are blurring in both directions i.e. 45 degrees and down here a negative of 135 degrees as it turns out so in the opposite direction as well from the center of the layer in this case.
And if you don't want a bidirectional effect then you would have to mask the effect. For example, if you wanted to make something look like you were shooting in a single direction then you could use a layer mask to convey that and I will actually show you how to do exactly that in my photo again I know my Photoshop channels and mask series you can checkout Chapter7 which is called layer specific masks and a very first exercise that's called a jet of motion blur, shows you how to basically assign a unidirectional effect to a jet as it turns out. And it may sound like I am hyping this series, I am not.
It's available. If you are a subscriber to Lynda.com it's free. You can just go there and check it out anytime you want. So anyway, there it is the Motion Blur Filter assigned to this lower right image and over here in the lower left corner we have got the Surface Blur Filter applied from the previous exercise and just for the sake of comparison I am going to press the Home key that's going to take us up to our original blur filters, the results of our original blur filters at least. Here's Gaussian Blur on left and here's Box Blur the Linear Box Blur function on the right, compare those if you will to Surface Blur and Motion Blur.
Alright in the next exercise we will finish off the analytical discussion with a look at Radial Blur.
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