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PS把自己得照片改为漫画艺术风格
 最近看到了一个帖子关于用PS这样一个，漫画风格的照片修改过程，着实让人震撼！
如果自己能够学会，将自己的照片进行修改，作为头像或网络资源，或着送给女友的礼物
呵呵我想一定乐趣无穷^_^！不过，这还是一个需要相当强Photoshop功底的修改过程，
我的能力很有限，学了很久，水平还是很一般
现在还是拿来跟的分享一下吧！（英文教程转贴）和那些大师及的作品
 a) Preparing the Canvas
Open your picture in photoshop that is going to become pop art and duplicate the layer called "Background". (Just click the layer called "Background" and drag it to this icon
 at the bottom of the layer window to duplicate the layer.)
Rename this new layer "dots". (To rename a layer right-click on the name in the Layer Palette and select Layer Properties). Create another new layer and fill it bright blue using the Paint Bucket tool
 Drag this layer between the two existing layers and rename it something meaningful i.e "blue". The image below shows what your Layer Palette should look like. This is the basic set up to begin.
 Now working on the "dots" layer we need to clear out all the unwanted parts of the photograph. In this case I want to isolate Scarlett and delete the rest i.e lilac background and bit of text. To cut out Scarlett I use the Pen Tool. Now to sum up how to use Photoshop's pen tool in a few sentences isn't easy...if you have never used the pen tool before, do the first. Remember to make sure the pen tool is set to create a Work Path. See below.
 *NOTE: You could use the eraser tool but the results won't be as professional. Take the pen tool create a path around the person (or thing) and then make it into selection. Invert the selection (CTRL + Shft + i) and hit delete. Deselect (Ctrl + D)
 b) Making the Dots
Desaturate the "dots" layer (Ctrl + Shft + U).
 Next adjust Threshold to something dramatic (still working on the "dots" layer).
Image >> Adjustments >> Threshold... The settings I used are shown in the image below, but you will need to experiment to see what threshold settings works for YOUR image  Using Threshold will leave the image looking very pixelated (jagged). So apply Gaussian Blur (approximately a 2-3 pixels should do it). Filter >> Blur >> Gaussian Blur...
 In your Layers Palette right-click on the "dots" layer
and select Duplicate Layer.... See image below
 Select New for the Destination Document. Now you will have 2 documents open in photoshop
 Working on your new document change the Mode to Greyscale. Now change the Mode to Bitmap.
 Next appears the Halftone Screen box. Apply the settings shown below. Note you may want to experiment with the Frequency as this decides the size of the dots. Click OK.
 Almost there with the dots. All that's left is to transfer the dots back to the first document. (See part C).
 c) Organising
Change the Mode back to Greyscale In your Layers Palette right-click on the layer and select Duplicate Layer.
 Your Layers Palette should look like the one shown below. You can close the second psd that you created..there's no need for it now
 The final step for creating the dots is to create a Clipping Path between the new layer and the "dots" layer.
 Now link the "dots" and "Background copy" layer. See image below. If you are using Photoshop CS or CS2 instead of linking and then merging the linked layers, after creating the clipping path simply click on the "background copy" layer in your layer palette and then Merge Down.
Your picture should now look like the one shown below..only better because it's not so small and compressed!
 Now is a good time to Save (Ctrl + S) your work.
STEP 2. Adding ColourHaving achieved a great looking half tone effect, it's time to add the colour. At the bottom of this page I will briefly show how intermediate level photoshop users can really take their images one step further. Combining this tutorial with my tutorial you can really achieve stunning results a) Creating Fill Layers Duplicate the "dots" layer. Rename this layer "white" and drag it below the "dots" layer in your layer palette. Adjust the Brightness/Contrast on the "white" layer.  Change the blend mode on the "dots" layer to Multiply.
 Click on this icon at the bottom of your Layer Palette and select Solid Colour...
 Select a colour in the Colour Picker dialogue box. Click OK. I've gone for a red shade to colour her lips. You don't need to be too picky here because we can change the colour easily later on
 The new fill layer created will appear in your layer window. Right-click and rename the layer e.g "lips" to colour the lips.  Create a Clipping Path between the "lip" and "white" layer. This will ensure that you don't colour over the lines ^_^  Change the foreground colour to black. Working on this new layer, take your Paint Bucket Tool and fill the "lips" layer black. The colour disappears...this is because the colour will only show up where there is white on this fill layer. Now for the colouring. Change the foreground colour to white. Get your Paint Brush Tool and start painting where you want to the colour to appear. Use a hard brush with the opacity set to 100%. Make sure that you zoom in when colouring, so that it is nice and tidy!  **Fill layers can be confusing if you haven't used them before. b) More Fill Layers Repeat the above step creating a new fill layer for each colour/item in your picture. Below is my layers palette.
 Note how I have used clipping paths on all the new fill layers.
 At any time if you are unhappy with a colour that you have chosen, simply double click on the Layer Thumbnail (as shown above) and re-select a colour. Now you have the ability to change the colour of the hair for example, to a whole new colour in a second flat!!
 You're pretty much finished.
COMBINGING WITH LINE ART TUTORIAL I've had a lot of people ask me how I create half tone shading on my line art pictures.to see my finished Scarlett Johansson pop art piece. I've written two tutorials on creating the line art. The picture of my layer palette below pretty much explains it all.  If you are interested in creating the pattern I used for the background of my final Scarlett picture, the pattern is made with a custom shape. If you are using Photoshop 7, CS or CS2 then you will have it already in your custom shapes (the arrow, marked 2, is pointing to it in the above image). You will need to select Show All to see it (see the image above, click on the area, marked with the 1 arrow to reveal custom shape options -Show All). If you are using an earlier version of Photoshop then you need to make it. Check out my Digital Candy Tutorial(just do the first page). That's it! Also check out the following page to see some fantastic art that others have created by following this tutorial... 
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