If you don't know what Gmask is its a programme that will blur and distort images so they are obscured using a variety of algorithms. The fun part is that by opening an image masked in Gmask you can un-mask it to reveal the original image as long as you "solve" it correctly by applying the correct algorithms to the image.
The general idea is that a gmasked image itself is sfw but the original is often nsfw . Thus giving you a reason for unmasking the image.
Masking an image is very easy highlight the area you wish to mask, then click on the various filters to apply that mask. Most masked images combine several masks on top of each other or spread around an image.
IMPORTANT DON'T USE THE CP MASK AS IT IS UN-BREAKABLE WITHOUT THE PASSWORD
To unmask the image you need to highlight the masked area and apply the same filters used to mask the image in reverse order,except M+/M- you must apply the opposite used,i.e if M+ used apply M-.
Another tutorial on recognising various masks, below.
Download the Gmask programme here
A few good (nsfw) Gmasked images here
Good ED page on Gmasking here
(Good tutorial and Gmasked images to practise on)
So everyone post their Gmasked images here, its also always nice if you include the solution (use spoiler tags).
I'll post a few to start off with..
These are quite easy, I didn't want to put everyone off on their first go.
EDIT:Can't get spoiler tags to work, most of the masks I've posted are quite easy anyways.