You can make semi-transparent pixels opaque in GIMP by adjusting the transparency threshold. Essentially, you set a level, and all pixels with transparency above that level become fully opaque.
Here's how it works:
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Determine the Threshold: GIMP uses a scale from 0 to 255 to represent transparency. 0 is fully transparent, and 255 is fully opaque. You need to decide the transparency value at which you want pixels to become completely opaque.
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Apply the Threshold (Method 1: Using Alpha Tools - EXPERIMENTAL)
- Go to
Colors > Alpha > Set By Threshold... - A dialog box will appear.
- Adjust the "Set threshold" slider. Any pixels with alpha values greater than this number will become opaque (alpha = 255).
- Click OK.
- Go to
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Understand the Effect: With this method, pixels that were more transparent than your threshold will become completely transparent (alpha = 0), while pixels that were less transparent will become completely opaque (alpha = 255). Any pixel that has a value equal to the "Set threshold" value will also become completely transparent (alpha=0).
In summary, adjusting the transparency threshold allows you to effectively turn semi-transparent pixels into fully opaque ones (and some to fully transparent), giving you control over your image's alpha channel.
