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I made this tutorial ages ago, i just found it on a diff forum and i copied it. i thought this could be useful to the beginers.
Ok, in this tutorial you'll learn how to make a really easy sketch. Open up your Photoshop.
1. Open up any picture you like, i chose this.

2. Go to Image>Adjustments>DeSaturate.
3. Duplicate your layer. ( CTRL+J )
4. go to Image>Adjustments>Invert (CTRL+I)
5. Set the mode to Color Dodge
6. Dont worry, You should see pretty much nothing, or barely anything. Dont Worry, thats normal. Now go to Filter>Blur>Blur More
Note: If you can barely see the lines press Ctrl+F so it does Blur>Blur more again, keep doing until you like your result.7. Your done! Enjoy!!!
My Finished Results >

Other things i made with the Sketch Effect -

~PinkPanther
[copyright to pinkpanther of furiousgfx 2005]