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Green screen/Blue screen tricks.


Paul

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Is it possible to use say a green screen back drop take images of models then add them to other images with different backgrounds in Photoshop alone, or does it have to be via other Adobe programs?
What i am trying to ask is would it be an easier cleaning process of green background over say conventional ways of deleting/removing unwanted backgrounds?
 

Hoogle

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Yes you can get free chroma key plugins for photoshop, but you can also do the blend if trick and instead of black and white set the color to green/blue or whatever colour you set the background to be. just dont have same colours on model as background.

in after effects and premier it is really easy to use chroma key but not sure if photoshop has a specific chromakey function without 3rd party plugins other than blend if
 

Paul

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Thanks H hope all is good health wise mate:thumbsup:

I found this on the back of your wording for procedure -
Chroma keying is typically used to replace a background that is too difficult to travel to or too hard to create in a studio. Movies are not the only formats that use green screens, as these can be very useful tools in photos. Photoshop has its own feature to use the green screen or chroma keying effect. This can be used to easily change the background or to make a really interesting background for portraits.
[h=4]Step 1: Color Range[/h]Open up the photo that used the green screen as the background. The easiest way to change out the green screen is by using the color range features. The following settings need to be set with the color range tools:

  • have the radio button selected
  • use grayscale in the selection preview
  • ensure that the invert checkbox is selected
  • ensure the slider for fuzziness is set at around 30
[h=4]Step 2: Select the Color[/h]Click a green spot on the green background. With the picture changed to grayscale, the green will be a white color and the rest of the image black. If there are some green areas that are not highlighted, then hold down the shift key and click on those spots. Many times these areas will not initially be highlighted because they may be a different green shade.
[h=4]Step 3: Select All Green Areas[/h]If some of the white areas and pixels are not selected, then it may be necessary to lower the slider setting on fuzziness. Clicking and dragging the mouse key while holding the shift key down can also help. If you need a lot of accuracy, then zoom in to the different areas by pressing the control and plus buttons and then selecting all the necessary spots.
[h=4]Step 4: Select Background Layer[/h]Before removing the color, ensure that the background layer is selected. The layer that will contain the green should be changed to the normal layer. Once it is selected as normal, then invert this layer under the select menu. Hit delete, and then the green colors that have been selected will be removed.
[h=4]Step 5: Halo[/h]Many times, the person or object may still have a bit of a halo around them. The edges can be cleaned up in the layering menu by using mattes. The different mattes that can be used include the defringe matte or remove white matte. Normally setting the pixels from 1 to 3 can easily take care of the halo effect.
[h=4]Step 6: Insert Background[/h]Now that the object has been cut out, it is possible to insert the new background as a new layer that is behind the current layer with the object or person.
[h=4]A Few Tips[/h]To get the best chroma key effect possible, try to make sure that the green screen background is uniformly lit. Any shadows or different shades of green will make selecting the background color for replacement difficult. When taking a picture, make sure the RAW setting or JPEG compression is set at the maximum setting. Also experiment with some of the different settings within the Photoshop software to get the best effect. There are many tools that can be used to get a fantastic final picture.

Thanks again.
 

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