====== Gimp - Make a transparent background/selection on an image ======

  - Open your image.
  - Select the area you want to make transparent.
  - Select the appropriate selection tool from the Tool window or the Tools – Selection Tools menu on the Layer window. I usually use the magic wand/fuzzy select (Select contiguous region) tool or the Select regions by color tool.
  - Click in the region you want selected. Use shift-click to add more regions/colors.Tip: It’s easier if you zoom in (View – Zoom menu) to see finer details of exactly what you’re selecting.
  - In the Layer window (the one showing your image), select Layer – Transparency – Add Alpha Channel.If this is blanked out then it’s already done. This makes sure your image can store transparency data
  - Select Edit – Clear. This makes the selection transparent.
  - Save the file. Note: If you save it as a PNG file, be sure to select the ‘Save colour values from transparent pixels’ option in the Save as PNG dialog box.