Photoshop Tutorials - Layer Styles - Blending Options
1) Blending Options
This is the first layer style that controls the opacity and blending.
General Blending - these are the basic settings of the layer, you can set the Blend Mode and set the opacity of the layer.
Advanced Blending - with these options you can set the Fill Opacity parameter that is identical to the Fill option in the Layers palette, set the color channels and determine the Knockout mode. To see how the Knockout option works we can do the following,. Open an image in Photoshop. Create a text layer. Then add a new layer and place it under the text layer. In this layer using any brush paint over the letters. Then bring up the layer styles options for the text layer, set the Knockout to Shallow. You will not see any changes, but try reducing Fill Opacity option and you will see that instead of the paint that is underneath the text layer you see the image that is in the background. The difference between Shallow and Deep is that Deep option will show the background no matter how many layers there are between the active layer and the background.
Below the Knockout option you will see the other options that influence the Fill Opacity effect, you will get a better understanding of them after our next tutorials.
Blend If - this section determines the selective opacity. You can make dark or light parts of the image transparent.