Neon Posterization

Posterization reduces an image to a limited number of tonal values. Photoshop has the command Image > Adjustments > Posterize, which changes the image pixels themselves, or you can use a Posterize adjustment layer instead. In either case, the Posterize dialog box lets you choose the number of levels that should remain in the image. But an adjustment layer lets you change your mind later and experiment with combining posterization with blending modes.

l In the Layers palette, click the "Create a new fill or adjustment layer" and select Posterize Name this layer "Posterize."

2 The Posterize dialog sets how many tonal values should remain in the final posterized image For a strongly posterized result, select a low number

Solid Color...

Cradient.,

Pattern...

Color Balance,, Brightness/Contrast,, Hue/Saturation... Selective Color.. Channel M ■ ■ Cradient Map... Photo Filter..

Solid Color...

Cradient.,

Pattern...

Color Balance,, Brightness/Contrast,, Hue/Saturation... Selective Color.. Channel M ■ ■ Cradient Map... Photo Filter..

3 Change the Posterize adjustment layer's blending mode to Linear Burn using either the pull-down blending mode menu or the shortcut Alt/Opt-Shift-A. It'll be clearer later on if you now rename this layer "Posterize + Linear Burn "

it In the Layers palette, duplicate the original image layer by dragging the background layer onto the "Create a new layer" icon, or use Ctrl/Cmd-J

5 Move the duplicate layer to the top of the layer stack and change its blending mode to either Difference or Exclusion Toggle between these modes using either the pull-down blending menu or the keyboard shortcuts Alt/Opt-Shift-E or Alt/ Opt-Shift-X Name the layer either "Difference" or "Exclusion."

6 Apply some Gaussian Blur to the Difference/ Exclusion layer The amount can vary widely, so you must experiment For this motel sign, I used a radius of 30

Halo Halo

I applied a Gaussian Blur with a radius of 30 to the top layer This created the halos around the arrow and other bright details

For variation, I added a yellow-filled layer, setting its blending mode to Dissolve and its opacity to r or 2% This produced a yellow graininess over the image I then used Select > Color Range to mask out the sign and restrict the effect to the sky Would you believe this shot was taken at midday in Arizona?

Mondrian

Details disappeared if I used a blur radius greater than

I Layers ' Channels I Paths P

O Difference ' Opacity: 100% j Q

Difference + BSur 30

Fill:

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Difference + BSur 30

Burn

Difference + blur 10

Posterize + Linear Burn

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Difference

B 100

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Linear Burn

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Q Difference 100 100

Q A Lineal Burn B 100 (100

Difference mode

Colored solarization

Opposite effects

The reversal effect of the Difference blending mode is particularly prominent in this image

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Exclusion can work better than the Difference blending mode I also desaturated the top layer to remove the ugly gray-purple color from the halo around this replica of Liberty

Layers Channels J Paths

l Exclusion + blur 30

Posterize + Linear Burn

Background

To keep the fine detail in the shutters, only a small blur radius was used on the top layer

Difference produces a more direct reversal effect, while Exclusion is weaker and maintains some of the original colors

Layers "^^annels Path Exclusion v] Opacity: 100% »

Layers "^^annels Path Exclusion v] Opacity: 100% »

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Difference

B 100

C 100

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Exclusion

B 100

C 100

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Exclusion

B 100

C 100

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Linear Burn

B 100

C 100

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Linear Burn

B 100

C 100

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Linear Burn

B 100

C 100

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