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Okay. So in this chapter we are going to see what a world without the Gaussian Blur function would like if we had some other less sophisticated kind of blur available to us. Spooky, another spooky chapter. Actually it's interesting when I was first working on my Photoshop One-On-One Book the first version a few years back, I wrote that a lot of people, this is true, a lot of people pronounce the Gaussian Blur as Gassian Blur which is totally wrong it's not Gassian Blur. And I instructed my readers that if they heard somebody say Gaussian Blur you should slap them.
My editor wouldn't let it fly. He didn't think that was a crime worthy of slapping which to me implied that he thought there were crimes that were worthy of slapping this just didn't happen to be one of them. I mean if this isn't worthy, if you can just go around calling Gaussian Blur Gassian Blur and not get slapped what kind of punishment is there. So of course we changed it to if you heard somebody say Gassian Blur, you should cane them. We didn't do that. I just caved, I just got rid of it. Let's go ahead and slap this layer over here the top right layer here and you will need to select it first.
Go to the Layers palette and click on 2TR right there in order to make it active and now let's apply what's known as a Linear Blur function where you don't have that nice bell shaped transition there, you just have a straight diagonal transition imagine that. And to apply that kind of blur you go up to the filter menu, you choose blur and you choose this guy right here box blur it's a linear blur function. It's called box blur and you will see why in a second, it has sort of a boxy appearance. Let's ignore the fact that you can raise and lower the radius value.
Let's just cut to the chase and enter a radius value of 20 pixels and click OK. And do you see what I am talking about? You can see harsh edges in this blur. There is an edge right there that's where the blur starts and then it goes there and it's done. So that's the diagonal linear blur going on here and we have the same thing around this dark rectangle, the blur starts right there at least that's what it looks like, it blurs to this point right there and it stops and it looks like it gets lighter. And we have got this weird optical illusion here and it is an optical illusion by the way, there is no lightness at this location but it looks like we all of a sudden have a little bit of lightness there and a little bit of extra darkness there.
Totally our eyes making that up by the way but notice if we employ the Gaussian bell shaped curve we don't have that problem. Gaussian good, linear bad is one moral of this story. The other moral is that if you need a linear blur then you have it inside of Photoshop and remarkably enough we didn't have a linear blur inside a Photoshop until the last version until Photoshop CS2 and it can be on occasion you may find it useful I will put it that way but I just want you to see that it's there so you know how great if nothing else, how great Gaussian Blur is and you will also know that if you call it Gassian I will slap you.
I am not going to really slap you, I just had to say that it just seemed like fun really.
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