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Maybe you have seen this simple creative dot effects but if you don't know how to use it this tutorial will be helpful for you.
CREATING YOUR WORKSPACE
	Lets start with creating our working space. Create easily adjustable size of new document with single background. And add our object in a new layer, which we already cropped and ready to use for halftone effect.
CREATING NEW ALPHA CHANEL
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Select the channels palette by clicking on its tab as shown in the picture opposite. Create a new channel by clicking once on the 'new channel' button at the bottom of the channels palette. You can call this new channel anything you like, but default names are normally pretty self-explanatory.
SELECTING WORKSPACE
	While you are working on new alpha channel press and hold CTRL on your keyboard whilst clicking on your object layer to form a selection around your image. You can now let go of CTRL, but keep the selection active. In the new channel, Edit> Fill the selection with pure black and then Select > Deselect.
CREATING HALFTONE EFFECT
	Go to Filter > Blur > Gaussian Blur and enter in a value appropriate to the kind of effect you want to create. If you are aiming for a large subtle fadeout choose a large value but, if you desire a sharper effect, keep the value small. Experimentation is the key. Go to Filter > Pixellate > Colour Halftone and set the max radius to 10. This number relates to the overall size of the biggest dots, and can be varied to taste. Your channel should now resemble the image opposite.
FINISHING
	After creating your halftone dots you can change the colors and use it for your design. I hope this tutorial is uselful for you. If you have any questions please d not hasitate to get in touch with me.