Blend modes are a cornerstone of non-destructive photo editing, allowing you to combine layers in complex ways by controlling how their pixels interact based on mathematical formulas . While most blend modes treat the Opacity and Fill sliders identically, a specific group known as the “Special 8” creates unique results when you adjust Fill instead of Opacity, unlocking powerful creative effects.
📝 A Summary of Common Blend Modes
Blend Mode
Category
Role in Photo Editing
Normal
Default
The standard mode. The top layer simply covers the one below, with its visibility controlled by opacity .
Multiply
Darkens
Multiplies the base color by the blend color, resulting in a darker image. Perfect for adding shadows, removing white backgrounds, or adding density .
Screen
Lightens
The opposite of Multiply. It multiplies the inverse of the colors, always creating a brighter result. Ideal for adding highlights, glows, and creating double exposures .
Overlay
Contrast
Combines Multiply and Screen. It darkens dark areas and lightens light areas, boosting the overall contrast of an image .
Soft Light
Contrast
A softer version of Overlay. It lightens or darkens the base color based on the blend color, creating a subtle, diffused lighting effect .
Difference
Inversion
Subtracts the blend color from the base color, creating a high-contrast, inverted look. Useful for finding exact alignment between two similar images .
Hue / Saturation / Color / Luminosity
Component
These modes separate the color information from the tonal information. For example, Color applies the hue and saturation of the top layer while keeping the lightness of the layer below, making it very useful for colorizing images .
✨ The ‘Special 8’: Where Fill Makes the Difference
For most blend modes, reducing a layer’s Opacity (making the whole layer more transparent) has the exact same visual effect as reducing its Fill (which normally controls the transparency of the layer’s content but not its layer styles) . However, for eight specific modes, adjusting Fill yields a dramatically different, and often more desirable, result than adjusting Opacity . This is because, for these modes, the Fill slider affects the mathematical calculation of the blend itself, while the Opacity slider simply fades the final result .
Blend Mode
Category
Role & Creative Use
Color Burn
Darkens
Darkens the base color to reflect the blend color by increasing contrast. Using Fill with this mode is excellent for adding rich, intense shadows and depth .
Linear Burn
Darkens
Darkens the base color to reflect the blend color by decreasing brightness. It creates a more intense darkening effect than Multiply, and adjusting Fill allows for subtle, controlled burn effects .
Color Dodge
Lightens
Brightens the base color to reflect the blend color by decreasing contrast. It is the go-to mode for creating realistic, hot specular highlights and intense light sources, especially when combined with Fill.
Linear Dodge (Add)
Lightens
Brightens the base color to reflect the blend color by increasing brightness. It’s excellent for creating intense glows, adding flash effects, or blending bright textures, with Fill offering a wide range of intensity .
Vivid Light
Contrast
Burns or dodges colors by increasing or decreasing contrast based on the blend color. Fill is crucial for taming its often intense results, allowing for precise tonal adjustments and creative color grading .
Linear Light
Contrast
Burns or dodges colors by decreasing or increasing brightness based on the blend color. Adjusting Fill makes this a powerful and popular choice for subtle color grading and contrast control .
Hard Mix
Contrast
Reduces colors to one of eight primary hues: red, green, blue, cyan, magenta, yellow, black, or white. Reducing Fill transforms this from a posterizing effect into a versatile tool that reveals more colors from the underlying image, often used for artistic and grunge effects .
Difference
Inversion
Subtracts colors. While it behaves differently with Fill, it is less commonly used for this purpose but can create unique, faded inversion effects compared to using Opacity .
