What this skill does

# design-assets Create and edit graphic design assets: icons, favicons, images, and color systems. ## Tool Selection | Task | Tool | Why | |------|------|-----| | AI image generation | nano-banana-pro | Generate images from text prompts | | Image resize/convert | sips | macOS native, fast, no deps | | Advanced manipulation | ImageMagick | Compositing, effects, batch processing | | Icons & logos | SVG | Scalable, small file size, editable | | Screenshots | screencapture | macOS native | ## App Icon Generation Generate all required sizes from a single 1024x1024 source icon. ### iOS / macOS Icon Sizes ```bash #!/bin/bash # generate-app-icons.sh <source-1024.png> <output-dir> SOURCE="$1" OUTDIR="${2:-.}" mkdir -p "$OUTDIR" SIZES=(16 20 29 32 40 48 58 60 64 76 80 87 120 128 152 167 180 256 512 1024) for SIZE in "${SIZES[@]}"; do sips -z $SIZE $SIZE "$SOURCE" --out "$OUTDIR/icon-${SIZE}x${SIZE}.png" 2>/dev/null done echo "Generated ${#SIZES[@]} icon sizes in $OUTDIR" ``` ### Android Icon Sizes ```bash # Android adaptive icon sizes declare -A ANDROID_SIZES=( ["mdpi"]=48 ["hdpi"]=72 ["xhdpi"]=96 ["xxhdpi"]=144 ["xxxhdpi"]=192 ) for DENSITY in "${!ANDROID_SIZES[@]}"; do SIZE=${ANDROID_SIZES[$DENSITY]} mkdir -p "res/mipmap-$DENSITY" sips -z $SIZE $SIZE "$SOURCE" --out "res/mipmap-$DENSITY/ic_launcher.png" done ``` ## Favicon Generation ```bash #!/bin/bash # generate-favicons.sh <source.png> <output-dir> SOURCE="$1" OUTDIR="${2:-.}" mkdir -p "$OUTDIR" # Standard web favicons sips -z 16 16 "$SOURCE" --out "$OUTDIR/favicon-16x16.png" sips -z 32 32 "$SOURCE" --out "$OUTDIR/favicon-32x32.png" sips -z 180 180 "$SOURCE" --out "$OUTDIR/apple-touch-icon.png" sips -z 192 192 "$SOURCE" --out "$OUTDIR/android-chrome-192x192.png" sips -z 512 512 "$SOURCE" --out "$OUTDIR/android-chrome-512x512.png" # ICO file (requires ImageMagick) magick "$OUTDIR/favicon-16x16.png" "$OUTDIR/favicon-32x32.png" "$OUTDIR/favicon.ico" echo "Favicons generated in $OUTDIR" ``` ### HTML Meta Tags ```html <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png"> <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"> <link rel="manifest" href="/site.webmanifest"> ``` ### site.webmanifest ```json { "name": "My App", "short_name": "App", "icons": [ { "src": "/android-chrome-192x192.png", "sizes": "192x192", "type": "image/png" }, { "src": "/android-chrome-512x512.png", "sizes": "512x512", "type": "image/png" } ], "theme_color": "#ffffff", "background_color": "#ffffff", "display": "standalone" } ``` ## Color Palette Generator Given a primary color, generate a full palette: ```javascript // HSL-based palette generation function generatePalette(hue, saturation = 70) { return { 50: `hsl(${hue}, ${saturation}%, 97%)`, 100: `hsl(${hue}, ${saturation}%, 94%)`, 200: `hsl(${hue}, ${saturation}%, 86%)`, 300: `hsl(${hue}, ${saturation}%, 74%)`, 400: `hsl(${hue}, ${saturation}%, 62%)`, 500: `hsl(${hue}, ${saturation}%, 50%)`, // Primary 600: `hsl(${hue}, ${saturation}%, 42%)`, 700: `hsl(${hue}, ${saturation}%, 34%)`, 800: `hsl(${hue}, ${saturation}%, 26%)`, 900: `hsl(${hue}, ${saturation}%, 18%)`, 950: `hsl(${hue}, ${saturation}%, 10%)`, }; } ``` ## ImageMagick Quick Reference ```bash # Resize magick input.png -resize 800x600 output.png # Convert format magick input.png output.webp # Add border magick input.png -border 10 -bordercolor "#333" output.png # Round corners (with transparency) magick input.png \( +clone -alpha extract -draw "roundrectangle 0,0,%[w],%[h],20,20" \) -alpha off -compose CopyOpacity -composite output.png # Composite / overlay magick base.png overlay.png -gravity center -composite output.png # Batch resize all PNGs magick mogrify -resize 50% *.png # Create solid color image magick -size 1200x630 xc:"#1a1a2e" output.png # Add text to image magick input.png -gravity south -pointsize 24 -fill white -annotate +0+20 "Caption" output.png ``` ## sips Quick Reference (macOS) ```bash # Resize (maintain aspect ratio) sips --resampleWidth 800 input.png --out output.png # Exact resize sips -z 600 800 input.png --out output.png # Convert format sips -s format jpeg input.png --out output.jpg # Get image info sips -g all input.png # Rotate sips --rotate 90 input.png --out output.png ```