Opacity

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Width		pixel
Height		pixel

Right-click on the image and select "Save file as".

Copy the filter definition text to Clipboard.

Paste the filter definition text from Clipboard and click Ok button.

Title
Description
Selection region	Brush stroke Ellipse Rectangle User defined

User variables

Fragment shader code gl_FragColor = vec4(1.0, 0.5, 0.5, 1.0);

Name
Text
Type	int float
Initial value
Min value
Max value
Conversion	none pixel to texture coordinate 1/100