: Can I change the transparency of a selection keeping the relative transparency each part already has proportional? I want to give the middle full opacity but let the border effect that is already

@Harper654

One option might be to convert a color in your image to transparency:



Go to Layer -> Transparency -> Color to Alpha

This way you can choose exactly what you want to be transparent by making it a certain color and then converting that color to transparency.

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@Megan533

Each layer in GIMP can have the transparency for each pixel specified in two ways, that add to each other:

If you imported a PNG file with transparency, you background layer already has an alpha channel - you can keep that untouched -
Just right click on the layerś thumb on the Layers Dialog ctrl + L and pick
Add Layer Mask - that way a mask is created. It behaves as a grayscale image, where black means transparency and white means opacity - you can select if you are painting on the actual layer or on its maks by clicking on the respective thumbnails -
Just select the mask and paint it gray (by dragging and dropping a shade of gray on the canvas, or using the bucket fill) - and you have extra, prortional transparency for the whole image, without touching the original transparency levels.

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@Tiffany317

Not sure what you mean with "border effect" but here is how to have a transparent senter with a feathered border:


Layer > Transparency > Add Alpha Channel adds a transparent layer to the image if not yet present.
Select area with border effect (here Feather).
Press Del or select Edit > Clear to remove selected area leaving the transparent layer in the background.

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