Decals in Photoshop
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In this tutorial we are going to make a decal in Photoshop. I am using Photoshop CS2.
Step 1: Creating a file
Create a new file, with the following settings:
As you can see, I have created a preset with these options. You can change the size if you want, but I made it big so if neccessary, it can be scaled down. However, each dimension must be a power of two.
If you select 16 bit, you will not be able to save as a .tga file, the image needed to create a material, and if you don't select "Transparent", then the background will be white, which is not good, because it will lighten your decal.
Step 2: Drawing
This step is completely up to you. In this example, I have created a simple blood splatter.
Step 3: Opacity
Hold down Ctrl and click on the thumbnail of your layer. This should select everything you have drawn. Now, in the channels tab, click on "Create new channel". Your screen should look something like this:
Press Alt+Backspace. This will set the opacity of the selected part to what it corresponds to on your image.
Step 4: Saving
Save it as a Targa file. The rest of the default values should be correct.
That's all! Now you can make a material out of it.
Now proceed to Creating Decals.