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Chroma key

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Mark Soekarjo
Mark Soekarjo

Chroma key, also known as green screen removal, is a visual effects technique used to replace a solid-colored background with a new image. Key milestones include the 1940 film The Thief of Bagdad winning an Oscar for using blue screen and green replacing blue in the 1970s as cameras became more sensitive to green. When setting up a green screen photo shoot, the green cloth must be wrinkle-free and subjects and cloth must be properly lit to avoid shadows or spill. In Photoshop, the green screen is selected and removed using tools like Color Range, with the layer mask refined and any remaining green cleaned up. Refining the mask and cleaning up artifacts helps create a clean composite.

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Chroma Key green screen removal
Milestones ? The Thief of Bagdad (1940) wins Oscar for Special Effects for Larry Butler's use of blue screen ? 1970s green replaces blue for chroma key modern cameras more sensible to green
Set-up for photo shoot ? matte green cloth, avoid wrinkles ? 2 lights on subjects to avoid green light spill ? 2 lights on cloth to avoid shadows from model
Cut- outs from green screen in Photoshop ? Select>Color Range ? select green ? tweak Fuzziness slider ? use eye dropper to remove more green ? Alt-Click on layer mask icon ? Clean up mask ? Refine Mask ? Brush with black/white in mask for big areas ? works best with ? hard edged subjects ? no green in subject https://www.youtube.com/watch?v=wz7hbY8rYiM
Cleaning up Green Glow ? try out different methods for best and quickest results ? Hue/Saturation Adj. Layer ? desaturate greens, maybe yellows greens desaturate Clipping Mask
Clean up Artifacts ? gray outline ? Select Mask Filter>Other> Minimum ... ? jagged mask ? Select Mask Filter>Blur>Gaussian Blur
green glow in hair ? Hue/Saturation ? find settings to change green into hair color ? invert mask, paint away fringe with black in mask
dodge and burn ? non-destructive ? fill layer with 50% gray ? Blend mode Overlay ? paint with Black and White

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Chroma key

  • 2. Milestones ? The Thief of Bagdad (1940) wins Oscar for Special Effects for Larry Butler's use of blue screen ? 1970s green replaces blue for chroma key modern cameras more sensible to green
  • 3. Set-up for photo shoot ? matte green cloth, avoid wrinkles ? 2 lights on subjects to avoid green light spill ? 2 lights on cloth to avoid shadows from model
  • 4. Cut- outs from green screen in Photoshop ? Select>Color Range ? select green ? tweak Fuzziness slider ? use eye dropper to remove more green ? Alt-Click on layer mask icon ? Clean up mask ? Refine Mask ? Brush with black/white in mask for big areas ? works best with ? hard edged subjects ? no green in subject https://www.youtube.com/watch?v=wz7hbY8rYiM
  • 5. Cleaning up Green Glow ? try out different methods for best and quickest results ? Hue/Saturation Adj. Layer ? desaturate greens, maybe yellows greens desaturate Clipping Mask
  • 6. Clean up Artifacts ? gray outline ? Select Mask Filter>Other> Minimum ... ? jagged mask ? Select Mask Filter>Blur>Gaussian Blur
  • 7. green glow in hair ? Hue/Saturation ? find settings to change green into hair color ? invert mask, paint away fringe with black in mask
  • 8. dodge and burn ? non-destructive ? fill layer with 50% gray ? Blend mode Overlay ? paint with Black and White