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When using the paintbrush tool in Gimp, the brightness decreases according to the pressure and movement of the mouse.

irregular line

For example, when I continue the line I drew in the picture above, it becomes irregular compared to before.

enter image description here

This is the what I want it to be

So what I want is that the opacity of the brush doesn't depend on mouse movement or hovering over the old line.

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I don't know how you can apply "pressure" with a mouse.

One thing that puts some variation on how the paintbrush works is "Brush dynamics":

enter image description here

Make sure it is set to "Dynamics off".

Otherwise, the paint brush interpolates pixels, so slight shakes may some edge pixels darker or lighter. If you want to draw a clean straight line:

  • click on the start point
  • depress the Shift key
  • move the mouse to the end point: Gimp will draw a tracker line
  • click again when on the end point: Gimp draws the line.

You can even ask Gimp to make sure that the line is exactly vertical, horizontal or set to 15-30-45-60-75 degrees (a.k.a. constrained angles)by also holding Ctrl while you move to the end point.

enter image description here

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  • The thing is that the line left by the mouse is different depending on the position its position. Despite I click just once while using brushtool, the number and brightness of the dots left by the mouse changes depending on where the mouse is located. I want to remain this constant.
    – boughboug
    Jun 6, 2021 at 17:25
  • Hard to compare a straigh line and a wobbly line. When you are dealing with pixel-sized object anti-aliasing can have side effects. Maybe you want to use the Pencil instead of the Brush. It is not anti-aliased so you should et a constant color.
    – xenoid
    Jun 6, 2021 at 18:58

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