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I wouldn't recommend any of the colour select tools in GIMP for this. Also, there is already a tool specifically made for tasks like this in GIMP.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

If you need detailed instructions on how to use the Foreground Select tool, I wrote an answer here which goes into much more detail. I suggest you read this first as using the tool is not obvious. Also it's semi-automatic, so it still requires user input.

Anyway, here's an example of a mask I made with the Foreground Select tool. Here I'm toggling the mask on and off so you can see it.

I wouldn't recommend any of the colour select tools in GIMP for this. Also, there is already a tool specifically made for tasks like this.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

If you need instructions on how to use the Foreground Select tool, I wrote an answer here which goes into much more detail. I suggest you read this first as using the tool is not obvious. Also it's semi-automatic, so it still requires user input. Additionally, it's often necessary to edit the mask manually to refine or perfect it.

Anyway, here's an example of a mask I made with the Foreground Select tool. Here I'm toggling the mask on and off so you can see it.

I wouldn't recommend any of the colour select tools in GIMP for this. Also, there is already a tool specifically made for tasks like this in GIMP.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

If you need detailed instructions on how to use the Foreground Select tool, I wrote an answer here which goes into much more detail.

Anyway, here's an example. I'm toggling the mask on and off so you can see it.

I wouldn't recommend any of the colour select tools in GIMP for this. Also, there is already a tool specifically made for tasks like this in GIMP.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

If you need detailed instructions on how to use the Foreground Select tool, I wrote an answer here which goes into much more detail. I suggest you read this first as using the tool is not obvious. Also it's semi-automatic, so it still requires user input.

Anyway, here's an example of a mask I made with the Foreground Select tool. Here I'm toggling the mask on and off so you can see it.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

Here's an example. I'm toggling the mask on and off

If you need detailed instructions on how to use the Foreground Select tool, I wrote an answer here which goes into more detail

I wouldn't recommend any of the colour select tools in GIMP for this. Also, there is already a tool specifically made for tasks like this in GIMP.

You can use GIMP's Foreground Select tool to make a selection, then add it as a layer mask. Finally, add a new background layer and fill it white.

If you need detailed instructions on how to use the Foreground Select tool, I wrote an answer here which goes into much more detail.

Anyway, here's an example. I'm toggling the mask on and off so you can see it.