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GIMP Image Editing

GIMP Image Editing. Basic Edits. Cropping (cut out region) File format conversion JPEG/PNG/GIF Native XCF format Supports .psd (Adobe) Others… Rescale/Rotate (layers) Add caption (see text) Remove ex-girlfriend?. Starting up the GIMP. Toolbox (extra by default)

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GIMP Image Editing

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  1. GIMP Image Editing

  2. Basic Edits • Cropping (cut out region) • File format conversion • JPEG/PNG/GIF • Native XCF format • Supports .psd (Adobe) • Others… • Rescale/Rotate (layers) • Add caption (see text) • Remove ex-girlfriend?

  3. Starting up the GIMP • Toolbox (extra by default) • Basic tools found here • Image pane • Advanced tools in menus • New/Save • Set dimensions, mode, etc. • Export in 2.8 • Single-window option in 2.8 • Layers, Channels, Paths, Undo

  4. [CTRL] + Scroll Zoom [SHIFT] + Scroll Side scroll [CTRL] + Click Toggle tool’s settings (varies) [SHIFT] + Click Paint in straight line Hover + [F1] GIMP Help Browser [SHIFT] + Select Add to selection [CTRL] + Select Subtract from selection [CTRL] + [SHIFT] + Select Select intersection Standard Windozey bindings Some useful shortcuts

  5. Text (Type) Tool

  6. Text (Type) Tool • Click to type • Set font/style in toolbar • Either highlight to change, or set font/size/style before typing • Editor opens in new window • This is fixed in 2.7/2.8 • Outline a bit more involved • Path from text, stroke path

  7. Painting • Not MS Paint… • But it can compete • Paintbrush/Pencil/Airbrush • Brush types • Fuzzy/Fine • Custom brushes • Rotating in 2.8 • Fore/Background color • Bucket fill

  8. Patterns & Gradients (l) • Fuzzy vs. Fine brushes • Custom brushes • Paint with pattern/gradient • Gradient tool • Fill entire selected region • MANY advanced tricks use this • Think mathematically

  9. Dodge/Burn (D) • Selectively lighten/darken with paintbrush • Different from painting • Lighting effects • Similar to photography • Useful for contrast, emphasis, highlighting https://en.wikipedia.org/wiki/File:DodgeBurn.png

  10. Smudge/Blur (s/U) • Selectively blur or rub as oil painting • Similar to smearing paint with finger • Useful for censorship, emphasis, painting-like effect • [CTRL] + click for opposite effect • Useful for texture, esp. faces

  11. Cloning/Healing Comparison • Clone Stamp is most common • Duplicating patterns • Paint from clone source • Removing sections • Healing (Brush) more specialized • More gradual • Takes surrounding region into account • Removing blemishes • Smoothing small regions

  12. Select clone source [CTRL] + click (origin) Paint anywhere using origin as palate Origin moves with brush as you paint ??? PROFIT!!! Guide to Cloning/Healing

  13. Just like cloning but with perspective Set perspective Switch to cloning mode Select clone source Paint in new perspective ??? Meh, whatever Perspective Cloning (?)

  14. Fine selection • Paths tool (?) • “Intelligent” Scissors (magnetic lasso) • Fuzzy Select (magic wand) • Quick Mask (?) • Grow/Shrink/Feather

  15. Useful for curved but continuous selection Also curves in general Select multiple points Move/Resize vectors to adjust curves Create near full circle (no intersections) Select  From Path GIMP is not a vector program But it can use vectors Paths (b)

  16. Easier, faster, more robust, dynamic Not always better (see Rainbow Dash) Select key points More the merrier Linear path finding w/ graph theory Close loop, then adjust To finalize, click inside selection Intelligent Scissors

  17. Fuzzy Select (u) (Magic Wand) • Similar-colored surrounding regions • Only contiguous • Move mouse up/down to adjust sensitivity • Set default threshold • Ideal for selecting multiple regions

  18. COlor Select • Similar-colored regions • Entire image • Move mouse up/down to adjust sensitivity • Set default threshold • Also ideal for selecting multiple regions • Preferable for distinctive-colored parts

  19. Refining your selection • Quick Mask ([SHIFT] + Q) • Red overlay not selected • Paint/Erase selection • Select  Grow/Shrink • Select  Feather (blur) • Shapes (rectangle, elipse, freehand) • Rounded corners • Feathered edges • Guides

  20. Layers • Stacked in one image • Opacity & sizes • Edit one at a time • Preserve others • Copy/Delete/Create, Insert • Used for animated GIFs • Layer grouping in 2.8

  21. Modes, Masks, Transparency • RGB, greyscale, indexed (image as a whole) • Alpha channel • 24-bit vs. 32-bit • Layer mask • Black = 0 = transparentWhite = 255 = opaque • Black background and colorful foreground gives…

  22. Move/Resize/Transform • Layers as their own independent images • Perspective ([SHIFT] + P) • Filter  Distort  iWarp • Cage transform in 2.8, improved in 2.10 • Rotate/Resize/Flip ([SHIFT] + R/T/F) • Move layer or selection • Liquid Rescale (Content-Aware Resize) • Requires plug-in

  23. Questions?

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