Differentiate empty and non-empty pixels

I'm a web developer currently slicing an illustrator file for web graphics. Some of the icons and images have shadows, lights, etc, and it's impossible to simply see by a naked eye which pixels contains some shade or nearly transparent color and which doesn't.
It would be extremely useful if I could somehow easily differentiate between empty and non-empty pixels, so I wouldn't miss any when slicing.
Any advices??

Select the objects you want to cut, pick the artboard tool, and from its presets menu on the control bar choose Fit to Selected Art. In Safe for Web and Devices window, in the Image Size tab, make sure Clip to Artboard is checked. This will cut the image without including any empty (fully transparent) pixels.
edit: Alternatively if you hide unselected art (Shift+Ctrl+Alt+3), in the Safe for Web and Devices with the Clip to Artboard unchecked will cut the selected object/s without including fully transparent pixels. So with this approach you don't have to use artboards.
You can create new artboards for each icon, element, etc, by drawing with the Artboard tool and holding Shift. With the desired objects selected, draw a new artboard anywhere on the document with any size and choose Fit to Selected Art.
You can also see the bounding box that includes all pixels of the selected object/s while the selection tool (black pointer) is the current tool if you the Use Prevew Bounds option is on. This option is available in the General section of the Preferences and also from the flyout menu of the Align panel.

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