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In graphic design or digital art, more complex designs use multiple layers stacked on top of each other. The pixels of the higher layers are placed on top of pixels on lower layers, obscuring them in the process. While this default behaviour is perfectly acceptable, the use of blend modes across these layers opens up a world of creative freedom and possibilities.
Essentially, blend modes determine exactly how an upper layer’s pixel colours will blend with those on the layer(s) beneath. Results can vary quite dramatically depending on the chosen mode. There are five or six most commonly used modes but anywhere up to 30 modes may be available in your app.
Tip: Experimentation is key! Blending results depend entirely on the images you’re working with.Before we go any further…
This is your choice for a darkening effect. It multiplies the blend layer’s colour channel values with those of the base layer. Black in either layer gives black; white leaves the other layer’s colour unchanged. Lighter greys will give softer shadows, while darker greys will give deeper shadows. Why? Well, black has a value of 0, and white has a value of 1, and all other multiplied values are divided by 255. “Class, get your calculators out!”
So if Multiply darkens, then Screen will lighten—the complete opposite! Black is assigned a value of 1, white is assigned 0; the latter produces white. The inverse of the blend and base layer colours are multiplied. The resulting colour is always lighter.
Meet the clever combination of the above—Multiply and Screen combined together to increase contrast. In essence, it darkens darker areas, while lighter areas are lightened further. If the underlying layer’s pixels are <50% grey, it multiplies; if >50%, it screens.
A cool example of using flat colours with blend modes over images is put to effect in the following example, where we strip an image of its colour and use a Multiply blend mode to effectively colourize non-white & black areas of an image—in this case, all the grey tints. You can see this effect commonly in model studio shots used as artist covers in music streaming services, etc.
In reality, there are many other blend modes that can be used which offer more subtle and harsher blending effects. Their use is less common so they’re not included in this article—but you can experiment accordingly!
Most apps will also offer ‘on-brush’ blend modes so you can paint colour that will blend into the base layers as you paint. It’s worth trying these out if you want to blend layer content but only want to do so in specific brushed regions.
Blend modes are just as important in vector-based graphic design as in pixel-based raster design. The blend modes operate very similarly between the two disciplines with a slight difference: in the former, a chosen mode is applied to the selected object, with blending between that object and objects beneath, as opposed to the latter which is pixel layer over pixel layer.
That just about wraps up this article. I hope it’s given you some insight into the inner workings and application of blend modes.The next time you’re throwing some layers around, try a few blend modes out and see where they lead you!