When you mask a layer or group while a selection is active you'll immediate see the results, as all areas that lie outside of your currently active selection border are masked. Sometimes you may feel that the result is too drastic, and perhaps you want to unmask some currently masked areas to reveal layer contents hidden by the mask. Often, it can be difficult to visualize which areas you want to reveal because they are masked and therefore not visible. However, you can temporarily hide a layer mask by holding down the shift key and clicking on it in the layers palette. The mask thumbnail will be covered with a red 'x'. This will allow you to see your unmasked layer so you can decide which regions need to be revealed. Then, shift-click on the mask thumbnail to make it visible again and edit the mask's contents.
9 I Target all of the individual layers that you created, which fill the outlined areas of your artwork, and add them to a new group in the layers palette. Open up the crumpled.jpg file. Type Control(PC)/Command(Mac)-a to select all and then type Control(PC)/Command(Mac)-c to copy. Once you've copied the crumpled paper image, return to your working file. Create a new alpha channel in the channels palette. Target the channel and then type Control(PC)/Command(Mac)-v to paste the crumpled paper image into the new channel. Load the new channel as a selection.
10 I Target the new group containing your filled area layers in the Layers palette. With the current, channel-based selection active, click on the add layer mask button at the bottom of the layers palette to mask the group. Masking this group while the crumpled paper based selection is active will add a nice, subtle distress effect to all of the filled area layers within the group.
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