Blend Modes in Photoshop Elements 11
Blend modes that lighten
Lighten: Turns darker pixels transparent if the pixels on the target layer are darker than those on layers below. If the pixels are lighter, they’re unchanged. This effect is the opposite of Darken.
Screen: Lightens the target layer where it mixes with the layers underneath. Blending with black has no effect. This effect is the opposite of Multiply.
Color Dodge: Lightens the pixels in the layers underneath the target layer and infuses them with colors from the top layer. Blending with black has no effect. This effect is similar to applying a bleach to an image.
Linear Dodge: Lightens the layers underneath the target layer by increasing the brightness. This effect is similar to Screen but often makes parts of an image pure white. Blending with black pixels has no effect.
Lighter Color: When you're blending two layers, the lighter color of the two colors is visible.