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Project 1: Creating a Sketch from Scratch
Skills and Tools: Multiple Layers, Gaussian Blur, and Blending Modes
Photoshop has a ton of filters. In fact, there are 105 filters located under the Filters menu. Filters perform a wealth of special-effects operations; everything from artistic, distort, and even sketch effects, and while filters are very creative, and fun to use, there is a limit to what they can do. For example, Photoshop has no less than 14 Sketch filters, and while they do creative things to an image they can't do everything. What if you want to create what looks like a sketch effect and none of the sketch filters do what you want? If you don't know how to do things from scratch, you're stuck with the limitations of the filters. The technique you are about to learn will not only let you create an awesome sketch effect, but will give you a better understanding of how blending modes work with multiple layers. There are a lot of steps to this process; however, the end result is more than worth the effort. In addition, if this process seems familiar, they are; many of the steps used in the sharpening workshop are similar to this effect, until you get to the end.
The Project
In this project you'll take a photograph and through the judicious use of multiple layers, and blending modes convert in into a beautiful colorized sketch. There are a lot of steps in this workshop, but the final results are more than worth the journey.
The Process
Open the file sketch_start.psd in Photoshop, and then save it as my_sketch.psd .
Create a duplicate of the image by dragging the layer over the Create New Icon.
Click the Image menu, point to Adjustments , and then click Desaturate . The copied layer is converted into shades of gray.
Create a copy of the desaturated layer, and select it.
Click the Image menu, point to Adjustments , and then click Invert . The image layer becomes a grayscale negative (leave the negative image selected).
Click the Blending Mode list arrow on the Layers palette, and then click Color Dodge . The image appears to change to white.Note:
If you see areas of the image that do not change to white, but are pure black, don't worry, those areas of the image were originally pure black, and they will never convert to white.
Click the Filter menu, point to Blur , and then click Gaussian Blur .
Very slightly blur the image (just a few radius pixels) until you see a soft-ghosted outline of the image.
Click OK .
Select the top layer in the Layers palette, click the Layers Options button, and then click Merge Down , or press Ctrl+E (Win) or 
(Mac).You should now be left with the original image (the bottom layer), and the softly ghosted image (the top layer), which I've named, Sketch Effect.
Create a copy of the layer named Sketch Effect, and select it.
Click the Blending Mode list arrow on the Layers palette, and then click Multiply . The two copies combine to create a darker image.
Continue to make copies of the Sketch Effect layer until the image darkens to your taste (this might be 3 layers, or it might be 10).
Merge all the Sketch Effect layers together, but do not merge the original image layer into the Sketch Effect layers.Note:
You can quickly merge layers by using the Merge Down shortcut. Select the top layer, and then press Ctrl+E (Win) or Ctrl+E (Mac). This merges the top layer into the layer directly underneath. Continue using the Merge Down shortcut until all the Sketch layers are merged.
Create another copy of the merged Sketch Effect layer, and select it.
Click the Blending Mode list arrow on the Layers palette, and then click Multiply .
Click the Filter menu, point to Blur , and then click Gaussian Blur .
Add a small amount of Gaussian Blur to taste (1 or 2 Radius). This will soften the edges of the sketch image and create visually softer sketch lines.
Click OK .
Merge the two Sketch Effects layers together.
To colorize the image, select the top layer (Sketch Effect), click the Blending Mode list arrow, and then click Luminosity .[View full size image]
[View full size image]
The Results
Finish:
Compare your completed project file with the image in sketch_fnl.psd .
[View full size image]
Tweaking the Image
The subjective items that will influence the final sketch image are how much you Gaussian Blur the image, and how many additional copy layers you create. Creating more blur enhances the sketch lines, and adding more copy layer, increases the overall density of the final sketch image.Good to Know:
You can increase or decrease the intensity of the Sketch Effect by selecting the Sketch Effect layer and lowering its opacity.
