Paint Shop Pro Basics 39) Tools - Background Eraser Part 2


Uploaded by LeviFiction on 19.03.2010

Transcript:
Hello, and welcome to part 2 of Paint Shop Pro Basics
episode 39) the background eraser tool.
Now I left off mentioning that you can unmix colors that have been mixed together around soft edges
using a specific value in Paint Shop Pro.
I'm pretty sure that most, by the time they saw that, were going
"Oh, we have to change the hardness setting." Right?
Because the hardness is how hard or soft the brush is. No.
Hardness refers to how hard or soft the geometry of the brush is.
And PSP relies very, very, heavily on the geometry of the brush to erase the background.
So, the last thing you want to be doing. Is limiting how much geometry there is in the brush.
Now, PSP, in order to deal with soft edges gave us a completely different option.
Called sharpness. Right over here.
Traditionally, this is set to about 70.
Sharpness determines how sharp or soft an edge is between the foreground and background colors.
Now, I've zoomed in here on the image.
So we can see this.
You can see the sign here is very straight edged. It has very sharp defined edges.
The trees on this side, however, are very blurry. They have a very soft edge.
So I'm going to show you the big difference between a large setting and a small setting for sharpness.
When using a large sharpness we want the edges to be very, very, sharp.
So I can erase around this sign. No Problem. It will just define the sign for me.
But, you'll notice, as we get into the trees we still get that little halo.
Or we erase the leaves entirely. :D Haha.
If we bring the sharpness down, to around 30, that halo effect is gone.
As we go over everything it unmixes the color.
It's actually subtracting blue from the result and leaving us the soft edged leaves.
And I'm going pretty well over the sign. But if I get too close look what happens.
It starts to erase the color from the sign and we get this ridiculous semi-transparent edge.
So in order to deal with this we have to use a larger sharpness on the sign.
And then switch to a lower sharpness as we get into the trees.
And we'll be adjusting the size of our brush and the sharpness throughout our image
as we slowly go along.
Now there's another problem that you probably noticed.
Is that as I'm trying to get down in here the little holes of sky
Are not being erased. In fact I had to get so close to the tree
That I sampled the tree and now the tree is being erased.
And it still didn't erase those portions of the sky.
What's going on?
Well what's going on is an option called Limits.
By default, Limits is set to Continguous.
What contiguous means, and I'll show you by increasing the size of my brush,
What contiguous means is it will only erase colors directly in contact with the center of my brush.
If you look at what I have here. I have a small area on the left side of the red line
that my brush is covering. And I have this huge area on the left of the line that my brush is covering.
But, the two areas do not have any direct connection.
Because the red lines cuts off direct contact.
If I were to click with contiguous on, then only the right side is erased.
Undo that and set my limit to Discontiguous. And do the same thing.
And this time it erased on both sides of the line.
That's because with discontiguous the areas don't have to be connected.
This is really nice if you have objects with holes in them.
So you can get at the hard to reach areas.
The last limit is "Find Edges."
Find edges works like contiguous.
However, unlike contiguous, Find edges is more strict with where an edge ends and begins.
Even with a lower sharpness we're going to get a sharper edge by using Find Edges.
You can see how we still have white mixed with the red.
We're going to get a harder edge because it finds the edge sooner.
If you have soft edges and have a low sharpness.
Don't use Find Edges. Use contiguous or discontiguous.
But if you have a very strict edge, then find edges is perfect.
Now, again, size and sharpness are the only two settings you'll ever normally touch.
At least I hope I said it before.
Unless you absolutely need to change something else. Which will be rare.
But there is one option I need you to be aware of.
And that is, Ignore Lightness.
Now I have not tested this but the theory is
If either the background or foreground object is gray or unsaturated. Like a metal door or similar.
And the correlating foreground or background is very colorful
The difference in lightness maybe very minimal which will confuse the brush.
Remember there's a difference between the color and how light the color is.
The gray may be very light and match the lightness of say a sweater that's red in the image.
And it will confuse the brush.
To avoid this, turn on Ignore Lightness. But only in said situations.
Otherwise, never, ever, use that setting.
And that covers everything I can think of.