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《Ghosting and Photomatix》
-----本字幕由雷天音 整理制作-----
Photomatix has excellent deghosting tools.

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【----QQ 568031962----】
Deghosting is the process of removing those semi-transparent ghosty artifacts that

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【----ACELY STUDIO----】
occur in a final HDR merge when something in your scene moved between frames.

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And we already did a Deghosting demo of these three images using Photoshop and

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we're about to do the same demo using Photomatix.

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If you didn't see the Photoshop version, let me just show you the images real quick.

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I'm shooting these kids and they had the nerve to move between frames, can you believe that?

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I went back when I was a kid and someone who was shooting a bracketed set of me,

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I knew enough not to move. But with these kids these days, I just don't get it.

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Anyway, you can see his arms are flapping around there and his head is turning,

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and what that means is when I merge I am going to see ghosty arms and heads,

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and I don't want that. So let's go to it.

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I'm going to select these three images, drop them on to Photomatix, just like I normally would.

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Tell it to merge for HDR processing. These are the images I want to work with,

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and here I'm in my Preprocessing Options. I want to align.

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I want to reduce noise.

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I also want to remove ghosts.

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I have two options, Automatically or with Selective Deghosting, which they

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list as recommended.

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I definitely recommend this also.

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Sometimes you get lucky with Automatic and it works, but the selective

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deghosting tool is so easy to use.

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There's no reason not to just do this somewhat manual process.

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So I hit the Preprocess button and it goes through a good amount of the HDR

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merging process that it would normally have to do, even if I was not Deghosting.

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It's reducing noise. It's aligning.

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When it's done with that, there's going to be an intermediate step where

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I'm going to have the chance to drive the deghosting feature before it does its final merge.

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And here it is, this is the Selective Deghosting dialog box.

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Right off the bat, notice there's very good help information over here.

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A link to an HTML tutorial, a link to a video tutorial. You can look at those or

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you can just listen to me, and I've also got some written instructions here. It's pretty easy.

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First let's take a look at the ghosting problem. Look at this kid.

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He's got a little bit of an extra head, he's got a ghosting arm, he's got an extra foot,

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he's had better days.

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These two kids though while there are not obvious ghosting problems around

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them, but they are still suffering from some ghosting issues.

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Their faces are a little bit out of focus because there are actually three versions.

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They moved very slightly. There are basically three versions of these two kids

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just stacked on top of each other.

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So I need to deghost all of three.

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Let's start with this one, which is very obvious.

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All I do is click and start dragging with my mouse and as I do, I leave this

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little bit dotted line, so I'm just circling this kid and as you'll notice I'm

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not being particularly picky or careful.

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What I'm doing with this process is just clueing Photomatix into where the

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ghosting problem is.

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Once I've circled him, I then Ctrl+ Click or right-click if I'm using a

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two-button mouse or using Windows.

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And I get this popup menu.

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I can mark selection as ghosted area.

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When I do that, Photomatix now knows this is an area it needs to consider for deghosting.

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Now I could go ahead and circle the other two and head off to do my final processing,

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but I'm curious to know if this is really working, if I'm getting a good deghosting.

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So I'm going to preview Deghosting by clicking this button.

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It's going to think for a minute, and then bang, there it is.

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Look, his extra head's gone.

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His arms are sharp.

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His extra foot has gone.

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The pattern on his shirt has sharpened up, because there was some overlap there.

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That was leading to some ghosting effects that were basically just making

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for a soft focus.

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I'm going to return to Selection mode, so that I can move on to the other kids

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because I'm satisfied with that one.

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If I did not like the way he turned out, I could simply right-click within this

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area over here and I'll just show you I can right-click right here, we're

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going to mark this as a ghosted area, and now I'm going to remove selection.

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That takes it off and now I can start over and I promise you I won't make that

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mistake again. I will finish this deghosting lasso here.

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Now I don't know if you noticed, but if I just let and go off the mouse button,

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it automatically closes it so I don't have to go all the way back up to the top again.

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Again, I'm circling this kind of roughly.

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Mark selection as ghosted. Watch him very closely right in here as I click the

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Preview deghosting button.

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And there, kis his face just sharpened up. That one maybe a little

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harder for you to see in the small window size that this video will ultimately be presented.

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Circling the last one here and notice I'm now overlapping with the first one

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and that simply doesn't matter. Photomatix is smart enough to figure out which is

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which and how to separate all this stuff.

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So circle him, right-click, and Mark selection as ghosted.

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You know, I trust that it's working well.

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I'm now going to bother previewing. I'm ready to just hit OK.

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Before I do that, let's take a look at these two controls down here. I can zoom

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in to try and get a better view.

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If I don't know where my ghosting is, this is a great way to get a quicker or

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a more detailed look.

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I have a Brightness control here.

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As you've probably already discovered with some of your HDR merge, it is very

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often they come out of the merging process very dark.

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That can make it difficult to see if you have a ghosting problem.

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So I can crank the brightness up just to make my image easier to see.

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This is not a setting that will impact my final merge in any way.

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It's just a pre-visualization tool to make it easier for me to see any ghosting

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problems that I might have.

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So I'm going to hit OK and now it's extracting ghosting information.

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It's merging into HDR.

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Basically what it's doing, is it's doing its normal HDR merge process and then

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taking that extra deghosted stuff and layering that back on, blending it

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together, making sure that I have a very pretty image.

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There's the 32-bit version and then it immediately tone maps it into this.

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And let's just zoom in here and sure enough, look there. He doesn't have a

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ghosting problem, he's very sharp, he has a little bit of a chromatic aberration problem.

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There are some purple fringing in here, some green fringing there.

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I can take that out in Photoshop.

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It sure looks good.

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If you dig around in this image though, what you will find is down here we

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have a noise problem.

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I can take care of that in post processing. I'm not going to worry about that now.

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This is zooming in pretty close, so I'm not going worry too much about whether

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that noise is even a problem until I do a print and see if it actually is an

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issue that needs to be fixed.

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So that's deghosting in Photomatix. Play with it.

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Actually try and contrive some tests that force a ghosting problem, so that you

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can see how much you can correct it.

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Because once you know how much deghosting latitude you have, you might find that

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there are just more HDR subject matter out there for you. If you know, wow,

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-----本字幕由雷天音 整理制作-----
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this thing is moving quite a bit, but I got confidence that I'll be able to deghost it,

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suddenly you've got a wealth of new HDR material you can shoot.