Gimp: Advanced Operations

[last updated: 2023-03-03]
Gimp home page
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• On this page:
  • color gradient:
  • make a transparent background
  • make a mirror image

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• Color Gradient:
  • Select an area
  • Define desired foreground and background colors.
    This operation will create a gradient of color inside the selected area
    that ranges from the foreground to the background colors
  • Tools --> Paint Tools --> Gradient
  • Click and hold inside your selected area,
    at the end where you want your foreground color to start
  • Hold and drag cursor towards the other end of your selected area.
  • Release click when desired gradient is achieved.
  • Clear selection

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• Make transparent background:
  https://itsfoss.com/remove-image-background-gimp/
  • File ->> Open as Layers
    select desired .jpg or .png file
  • Click fuzzy select tool icon
    -or- Tools --> Selection Tools --> Fuzzy Select
  • Click in the background you want to remove
  • Layers --> Transparency --> Add Alpha Channel
    (not sure about this. it's apparently necessary if your orig drawing only has one layer...)
  • Press the delete key
  • Export as .png
    (also save as .xcf...)

• Insert object with transparent background
  into another drawing:
  • File --> Open as layers
    select base drawing .jpg or .png
  • File --> Open as layers
    select .jpg or .png that has transparent background
  • Adjust size/position of transparent layer to align as desired with base layer.
    (toggle base layer visibility to allow manipulating the transparent layer)
  • Export as .png
    (also save as .xcf...)

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• Make a Mirror image:
  • Tools --> Transform --> Flip

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