Image ProcessingGirls Who Build

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processing.org

Image by the Processing Foundation. Published under the GNU General Public License.

What do you think of when you hear image proces s ing?

Image processing is analyzing and manipulating an image through code.

Using math + computer s cience, we can analyze, enhance and dis tort images for all kinds of us es .

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Image via NASA (X-ray: NASA/CXC/SAO/J.DePasquale; IR: NASA/JPL-Caltech; Optical: NASA/STScI). CC BY-NC.

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Color on the computer

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A color image can be represented as a percentage of the red, green and blue “intens ities ” combined.

30% red

60% green

10% blue

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A color image can also be represented as a set of hue, value, and s aturation (HSB) values .

Shift acros s hue, but not s aturation or value

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Let’s make filters of our own!

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Blend mode Formula

Darken min(Target,Blend)

Multiply Target * Blend

Color Burn 1 - (1-Target) / Blend

Linear Burn Target + Blend - 1

Lighten max(Target,Blend)

Screen 1 - (1-Target) * (1-Blend)

Color Dodge Target / (1-Blend)

Linear Dodge

Target + Blend

Overlay (Target > 0.5) * (1 - (1-2*(Target-0.5)) * (1-Blend)) +(Target <= 0.5) * ((2*Target) * Blend)

Blend mode Formula

Soft Light (Blend > 0.5) * (1 - (1-Target) * (1-(Blend-0.5))) +(Blend <= 0.5) * (Target * (Blend+0.5))

Hard Light (Blend > 0.5) * (1 - (1-Target) * (1-2*(Blend-0.5))) +(Blend <= 0.5) * (Target * (2*Blend))

Vivid Light (Blend > 0.5) * (1 - (1-Target) / (2*(Blend-0.5))) +(Blend <= 0.5) * (Target / (1-2*Blend))

Linear Light (Blend > 0.5) * (Target + 2*(Blend-0.5)) +(Blend <= 0.5) * (Target + 2*Blend - 1)

Pin Light (Blend > 0.5) * (max(Target,2*(Blend-0.5))) +(Blend <= 0.5) * (min(Target,2*Blend)))

Difference | Target - Blend |

Exclusion 0.5 - 2*(Target-0.5)*(Blend-0.5)

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