The border line blurring

[shokinhan]

Some times the frame border are blurring, but when I add 1 pixel to the border, it will be distinct, and then I Make pixel perfect, it will be blurring again. Why ?

[ArenMook]

Select your UIRoot and hit Alt+Shift+P. This will pixel-perfect your entire UI.

[shokinhan]

If the border is distinct, when I press Alt + shift + P, it will change blurring again.

[JRoch]

Does one of the panel/widgets not have the half-pixel offset box checked?

[shokinhan]

How to checked  the half-pixel offset ? 
where is the menu?

[ArenMook]

It's set on the UIAnchor. Select yours, and check it.

[shokinhan]

I can't follow your means. Some UI has UIAnchor, some UI does not has UIAnchor.
Your means all that UI need to add UIAnchor, and then they will be distinct ?

[nah0y]

I think he's talking about the "root" Anchor, the one that is a child of your NGUI Camera.
On this UIAnchor script, there is a Half Pixel Offset property

[ArenMook]

You must have at least one UIAnchor in your UI. When you create a new UI hierarchy, the anchor is automatically added for you. Sounds like you removed yours. Anchors perform pixel-perfect correction.