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) –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

Some useful shortcuts [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

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

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

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

Dodge/Burn (D) Selectively lighten/darken with paintbrush –Different from painting Lighting effects –Similar to photography Useful for contrast, emphasis, highlighting

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

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

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

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

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

Paths (b) 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

Intelligent Scissors 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

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

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

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

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

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

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

Questions?