The second group of Blend modes (Darken, Multiply, Color Burn, Linear Burn and Darker Color) have a Neutral color of white. This means that white as a blend color will have no effect on the result color (white simply disappears). These blend modes all have stronger effects as the blend color becomes darker. Using the Fill slider on Layers palette using blend modes from this group may modulate this effect rather than performing a simple opacity blend the way normal mode does. By definition:
• Darken – Looks at the color information in each channel and selects the darker of the base or blend color as the result color. Pixels lighter than the blend color are replaced, and pixels darker than the blend color do not change.
• Multiply – Looks at the color information in each channel and multiplies the base color by the blend color. The result color is always a darker color. Multiplying any color with black produces black. When you’re painting with a color other than black or white, successive strokes with a painting tool produce progressively darker colors, producing an effect similar to drawing on the image with multiple magic markers. Multiply is a bit like sandwiching two chromes and projecting them together.
• Color Burn – Looks at the color information in each channel and darkens the base color to reflect the blend color by increasing the contrast. The result will always be darker and have more contrast.
• Linear Burn – Looks at the color information in each channel and darkens the base color to reflect the blend color by decreasing the brightness and – unlike multiply – it will clip values while doing so. It has a stronger darkening effect than either multiply or color burn. Linear Burn is a combination of color burn and multiply.
• Darker Color – Compares the total of all channel values for the blend and base color and displays the lower value color. Darker Color does not produce a third color, which can result from the Darken blend, because it chooses the lowest channel values from both the base and the blend color to create the result color.