chroma key
chroma key
Out of context: Reply #6
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- 2ndcrack0
Use Calculations:
First create a new alpha channel with red channel as source 1, blue as source 2, blending mode 'lighten'.
Next create a further new channel using Alpha 1 (which you just created) as source 1, green as source 2, blending mode 'subtract'.
This gives an alpha channel based on the green content but will need scaling using the curves command to full black/white values.