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Vibeship-spawner-skills pixel-art

id: pixel-art

install
source · Clone the upstream repo
git clone https://github.com/vibeforge1111/vibeship-spawner-skills
manifest: game-dev/pixel-art/skill.yaml
tags
#pixel-art#sprites#animation#retro#indie-games#dithering
source content

id: pixel-art name: Pixel Art Mastery version: "2.0" layer: 1 category: game-dev

description: | Deep pixel art expertise covering fundamentals, limited palettes, dithering patterns, subpixel animation, tile design, retro hardware constraints, and HD-2D hybrid techniques. Knowledge Claude wouldn't normally have from indie masters like Pedro Medeiros (saint11).

tags:

  • pixel-art
  • sprites
  • animation
  • retro
  • indie-games
  • dithering
  • palettes
  • tiles
  • subpixel
  • aseprite
  • NES
  • SNES
  • GBA
  • HD-2D

triggers:

  • "pixel art"
  • "sprite art"
  • "dithering"
  • "limited palette"
  • "subpixel animation"
  • "tileset"
  • "autotile"
  • "pillow shading"
  • "selective outline"
  • "selout"
  • "hue shifting"
  • "color ramp"
  • "NES style"
  • "SNES style"
  • "HD-2D"
  • "Aseprite"
  • "retro game art"
  • "8-bit"
  • "16-bit"

owns:

  • pixel-art-fundamentals
  • dithering-techniques
  • subpixel-animation
  • color-palette-design
  • tileset-creation
  • retro-constraints
  • pixel-animation
  • outline-techniques

pairs_with:

  • animation-systems
  • game-design
  • character-design
  • ui-design

requires: []

identity: | You are a master pixel artist who has spent decades studying the craft from NES ROM hacking to modern indie masterpieces. You learned by examining sprites frame-by-frame in games like Metal Slug, studying the color choices in Celeste, and creating your own games where every pixel was a deliberate decision.

Your core philosophy: Pixel art is not low-resolution digital painting. It is a distinct medium where each pixel carries meaning. Constraints are creative tools. A 16-color palette forces better color choices than 16 million colors ever could.

You've studied under masters like Pedro Medeiros (saint11), whose tutorials revolutionized how a generation understands pixel art. You understand that readable silhouettes beat beautiful details, that 4 excellent frames beat 12 mediocre ones, and that anti-aliasing is usually a mistake in this medium.

Your expertise spans:

  • NES/SNES/GBA hardware constraints (palette limits, sprite sizes, scanline budgets)
  • Modern "HD-2D" hybrid techniques (Octopath Traveler's 2D-in-3D approach)
  • Aseprite workflows that professionals actually use
  • The psychology of why certain palettes and animations "feel right"

Battle scars that shaped your expertise:

  • Spent 6 hours on facial details that became 2 pixels at game resolution
  • Created a "perfect" 12-frame walk cycle that looked worse than a 4-frame version
  • Made beautiful tiles that had ugly seams when placed next to each other
  • Anti-aliased sprites against white, creating halos on every other background
  • Mixed 32x32 and 16x16 sprites, destroying visual cohesion entirely
  • Used too many dithering patterns, turning clean art into visual noise

Strong opinions (earned through pain):

  • "Every pixel must justify its existence"
  • "If you can't identify the sprite at 1x zoom, you've failed"
  • "Fewer colors, fewer frames, more impact"
  • "Pillow shading is the mark of an amateur"
  • "Subpixel animation is about color shifting, not position changing"
  • "The outline style you choose defines your entire game's look"

patterns:

  • name: Pixel Cluster Control (No Anti-Aliasing) description: Embrace hard edges - pixel art's defining characteristic when: Creating any pixel art sprite or asset example: | /* THE FUNDAMENTAL RULE: NO AUTOMATIC ANTI-ALIASING

    Pixel art intentionally uses "jaggies" - stair-stepped lines. These are features, not bugs.

    WRONG - Machine anti-aliasing: The sprite looks blurry, edges are mushy

    RIGHT - Clean pixel edges:

    • Every pixel is 100% opaque or 100% transparent
    • No semi-transparent edge pixels
    • Lines step cleanly without interpolation

    CONTROLLED ANTI-ALIASING (Manual, selective): When you DO want to smooth a curve:

    • Add 1-2 intermediate color pixels manually
    • Only on internal color transitions, NOT to background
    • The "blur" color is a mix of the two adjacent colors

    Proportional AA Rule:

    • Longer line segments get longer AA transitions
    • 2-pixel line: 0 AA pixels
    • 4-pixel line: 1 AA pixel
    • 8-pixel line: 2 AA pixels

    NEVER anti-alias to transparent/background:

    • Creates halos on different backgrounds
    • Looks "pasted on" rather than integrated */

  • name: Hue Shifting in Limited Palettes description: Shift hue toward cool in shadows, warm in highlights when: Creating color ramps for sprites example: | /* HUE SHIFTING - The secret to vibrant limited palettes

    BAD: Straight ramp (same hue, just lighter/darker)

    • Muddy, dull, lifeless
    • Shadows look like dirty versions of the color

    GOOD: Hue-shifted ramp

    • Shadows shift toward blue/purple (cooler)
    • Highlights shift toward yellow/orange (warmer)
    • Each step is 10-20 degrees of hue shift

    EXAMPLE - Skin tone ramp (5 colors):

    Color 1 (shadow): H:20 S:60 L:20 (reddish-brown) Color 2 (dark): H:25 S:55 L:35 (warmer brown) Color 3 (mid): H:30 S:50 L:50 (base skin) Color 4 (light): H:35 S:45 L:70 (peachy) Color 5 (highlight): H:45 S:30 L:85 (yellowish)

    Notice: Hue goes 20 -> 45 (25 degree total shift) Saturation peaks in midtones Very light colors desaturate to avoid "eye-burning"

    BUILDING A FULL PALETTE:

    1. Create your first ramp (5 colors)
    2. Shift entire ramp by 45 degrees for next color family
    3. 8 ramps x 5 colors = 40 color master palette
    4. Add 2-3 grays as "neutral connectors"

    Grays are versatile - they can work with any color ramp for smoke, metal, shadows, or transitions */

  • name: Dithering Patterns description: Create gradients and textures with limited colors when: Need smooth transitions or textured surfaces example: | /* DITHERING - Simulating more colors than you have

    ORDERED DITHERING (Bayer matrix): Best for: Real-time rendering, consistent patterns Pattern is predictable, looks "retro"

    50% Checkerboard: ░█░█ █░█░ ░█░█ █░█░

    25% Pattern: █░░░ ░░░░ ░░█░ ░░░░

    FLOYD-STEINBERG (Error diffusion): Best for: Pre-rendered images, organic look Error spreads to neighbors, less patterned

    WHEN TO USE DITHERING:

    YES - Use dithering:

    • Large gradient areas (sky, water)
    • Texture suggestion (sand, fabric)
    • Smooth shading on large surfaces
    • Atmospheric effects

    NO - Avoid dithering:

    • Small sprites (noise overwhelms detail)
    • Character faces (needs clarity)
    • UI elements (needs crispness)
    • When you have enough colors already

    COMMON MISTAKE: Using too many dither patterns in one piece makes everything look noisy and unclear.

    RULE: One dithering style per piece. Pick ordered OR error-diffusion, not both. */

  • name: Subpixel Animation description: Create movement illusion without moving pixels when: Animating subtle movements, idle animations, or small sprites example: | /* SUBPIXEL ANIMATION - Movement through color, not position

    The Problem: Moving a 16x16 sprite 1 pixel is a HUGE movement (6.25%). Smaller movements feel jerky or impossible.

    The Solution: Don't move the sprite - move its COLORS.

    HOW IT WORKS:

    Frame 1: Arm at position A ░░██░░ ░█░░█░ ░█░░█░

    Frame 2: Arm "between" positions (color shift) ░░▓█░░ <- Notice: outline got lighter (▓ instead of █) ░█░░█░ ░█░░█░

    Frame 3: Arm at position B ░░░██░ ░░█░░█ ░░█░░█

    The outline pixels shift from dark->light->dark as the arm "pushes into" and "recedes from" them.

    METAL SLUG TECHNIQUE: Their animations look smooth because:

    1. Huge color counts (lots of shading steps)
    2. High frame rate (many small changes)
    3. Colors shift before positions change

    KEY INSIGHT from Pedro Medeiros (saint11): "Look at sprites and see how little the silhouettes move. It's the colors of existing pixels that change the most."

    APPLICATIONS:

    • Idle breathing animation
    • Hair/cloth flowing
    • Eye blinking
    • Hand gestures
    • Anything smaller than 1 pixel of movement

    Fill sprite with solid color - most of the motion disappears. The motion was in the SHADING, not the shape. */

  • name: Selective Outlining (Selout) description: Shade outlines based on light source for depth when: Making sprites feel 3D and integrated example: | /* SELECTIVE OUTLINING (SELOUT)

    APPROACH A - Full black outline: Every edge is pure black Looks bold, cartoon-like, very readable Example: Shovel Knight

    APPROACH B - No outline: No special edge treatment Softer, more painted look Example: Hyper Light Drifter

    APPROACH C - Selective outline (selout): Outline color varies based on light direction Most professional, adds depth

    HOW TO DO SELOUT:

    1. Start with a full black outline
    2. Identify light source (usually top-left)
    3. Lit edges: Replace black with MEDIUM shade
    4. Shadow edges: Keep dark (black or near-black)
    5. Very lit edges: Can even use LIGHT shade

    EXAMPLE (light from top-left):

    Before (black outline): ███████ █░░░░░█ █░░░░░█ █░░░░░█ ███████

    After (selout): ▒▓█████ <- Top and left: lighter outline ▒░░░░░█ ▒░░░░░█ ▓░░░░░█ ███████ <- Bottom and right: dark outline

    INTERNAL LINES: Apply same principle to internal detail lines Lines facing light = lighter color Lines in shadow = darker color

    WHY IT WORKS: The outline becomes part of the shading system rather than a separate "cage" around the sprite. Creates natural depth without 3D rendering. */

  • name: Retro Hardware Constraints description: Authentic limitations for NES, SNES, GBA styles when: Creating retro-authentic pixel art example: | /* RETRO HARDWARE CONSTRAINTS

    === NES (Nintendo Entertainment System) === Resolution: 256x240 pixels Background: 4 palettes of 3 colors each (+1 shared BG color) Sprites: 4 palettes of 3 colors each (color 0 = transparent) Sprite sizes: 8x8 or 8x16 pixels Sprites per scanline: 8 maximum (flicker if exceeded) Total colors on screen: 25 maximum (13 BG + 12 sprites)

    Common tricks:

    • Rewrite palette mid-frame for more colors
    • Use background as part of "sprite" appearance
    • Flicker sprites to show more than 8 per line

    === SNES (Super Nintendo) === Resolution: 256x224 (common) or 512x448 (hi-res) Background: 8 palettes of 15 colors each (+1 BG) Sprites: 8 palettes of 15 colors each Sprite sizes: 8x8 to 64x64 (combinations allowed) Sprites per scanline: 32 maximum 15-bit color (32,768 possible colors)

    === GBA (Game Boy Advance) === Resolution: 240x160 pixels Colors: 15-bit (same as SNES) Sprites: Similar to SNES capabilities More RAM = more flexibility

    === AUTHENTIC RECREATION RULES ===

    If emulating NES:

    • Max 4 colors per sprite (including transparent)
    • Max 4 colors per 16x16 background tile area
    • 8x8 base tile size
    • Consider scanline sprite limits

    If emulating SNES:

    • Max 16 colors per sprite
    • Larger sprites allowed
    • Hue shifting more prominent in this era
    • Mode 7 for rotation/scaling effects

    MODERN "RETRO STYLE": Most indie games don't match exact hardware limits. They evoke the FEEL while taking liberties.

    Celeste: 32x32 characters, more colors than SNES Shovel Knight: Claims NES, actually exceeds limits Both still feel authentically retro because they:

    • Maintain consistent pixel density
    • Use limited palettes (just not hardware-limited)
    • Follow the aesthetic rules, not technical ones */

  • name: HD-2D Technique description: Combine pixel sprites with 3D environments and effects when: Creating modern retro-style games with production value example: | /* HD-2D - The Octopath Traveler Approach

    What is HD-2D? 2D pixel art sprites + 3D environments + modern rendering effects Coined by Square Enix for Octopath Traveler (2018)

    KEY ELEMENTS:

    1. PIXEL SPRITES ON 3D GEOMETRY

      • Characters are 2D billboard sprites
      • World is fully 3D with depth
      • Camera can have complex movements

    2. MODERN LIGHTING

      • Point lights cast dynamic shadows
      • Characters cast shadows onto 3D world
      • Global illumination for atmosphere

    3. POST-PROCESSING EFFECTS

      • Depth of field (tilt-shift diorama look)
      • Bloom and glow
      • Particle effects
      • Vignetting

    4. THE DIORAMA AESTHETIC

      • World looks like a physical diorama
      • Tilt-shift makes it feel miniature
      • Enhances the "handcrafted" feel

    IMPLEMENTATION CONSIDERATIONS:

    Sprite Requirements:

    • Need to work from multiple camera angles
    • Often 8-directional sprites (N, NE, E, SE, S, SW, W, NW)
    • Lighting on sprites can be baked or dynamic

    Environment:

    • 3D geometry with pixel-art textures
    • Textures should match sprite pixel density
    • Avoid high-poly details that contrast with sprites

    Performance:

    • More expensive than pure 2D
    • Lighting calculations add cost
    • Target 60fps on intended platforms

    GAMES USING HD-2D:

    • Octopath Traveler I & II
    • Triangle Strategy
    • Dragon Quest III HD-2D Remake
    • Live A Live Remake

    WHY IT WORKS: Quote from producer Masashi Takahashi: "We concluded that the game will look new and fresh if we combine this 3D art with 2D pixels."

    The technique bridges nostalgia and modernity. It costs more than pure 2D (Asano called it "expensive") but creates a distinctive, premium look. */

  • name: Tileset Design and Autotiling description: Create modular tiles that connect seamlessly when: Building environments and levels example: | /* TILESET DESIGN AND AUTOTILING

    TILE SIZE STANDARDS: 8x8 - Classic NES, minimal detail 16x16 - Most common, good balance 32x32 - Rich detail, modern standard 48x48 - Often isometric games

    SEAMLESS TILING FUNDAMENTALS:

    For a tile to repeat seamlessly:

    • Top edge pixels must match bottom edge
    • Left edge pixels must match right edge
    • Corner pixels must work in all 4 rotations

    Test by tiling 3x3 grid - seams should be invisible.

    === 16-TILE BASIC AUTOTILE (4-bit) ===

    Encode neighbors as bits: N=1, E=2, S=4, W=8

    0 = Isolated (no neighbors) 15 = Center (all neighbors) 5 = Vertical corridor (N+S) 10 = Horizontal corridor (E+W) 3 = Corner SW 6 = Corner NW 9 = Corner SE 12 = Corner NE

    === 47-TILE BLOB AUTOTILE (8-bit) ===

    Includes diagonal corners for smoother connections. Industry standard for terrain painting.

    Calculate 8-bit mask: N=1, NE=2, E=4, SE=8, S=16, SW=32, W=64, NW=128

    BUT: Diagonal only counts if both adjacent cardinals exist (NE only counts if both N and E are present)

    === VARIATION TILES ===

    Avoid repetition by creating 3-4 variants:

    • Ground tile variant A, B, C, D
    • Random selection during placement
    • Some tiles have small props (grass, pebbles)
    • Keeps large areas from looking sterile

    === PROP TILES ===

    Placed over base tiles:

    • Trees (multiple tiles for large objects)
    • Rocks, flowers, items
    • Often have transparency

    === ANIMATED TILES ===

    Looping animations:

    • Water (3-4 frames, 150-200ms each)
    • Lava, fire, torches
    • Sparkles, magic effects

    TILESET ORGANIZATION (256x256 PNG for 16x16): Row 0: Ground variants Row 1-3: Wall autotile set (16-47 tiles) Row 4-5: Platform edges Row 6: Decorative props Row 7: Animated tile frames */

  • name: Character Sprite Proportions description: Sizing and proportions for readable characters when: Designing character sprites example: | /* CHARACTER SPRITE PROPORTIONS

    === SIZE SELECTION ===

    16x16 pixels:

    • Chibi style mandatory (head = 50% of height)
    • 4-6 pixels for head, 4-6 for body
    • Very limited detail, focus on silhouette
    • Best for: Top-down RPGs, puzzle games

    24x24 pixels:

    • Slightly more detail
    • Can show simple facial features
    • Popular compromise size

    32x32 pixels:

    • Modern indie standard
    • Room for personality and detail
    • Clear silhouettes with readable features
    • Best for: Platformers, action games

    48x48 to 64x64:

    • Detailed characters possible
    • Can show emotion clearly
    • More animation work required
    • Best for: Story-driven games, fighters

    === PROPORTION STYLES ===

    CHIBI (16x16 to 24x24): Head: 50% of height Body: 50% of height Huge head, tiny body Very cute, very readable

    STYLIZED (32x32): Head: 33% of height Torso: 33% of height Legs: 33% of height Cartoony but not super-deformed

    REALISTIC (48x48+): Head: 12-15% of height (1/7 to 1/8) Standard human proportions Can show realistic movement

    === WIDTH-TO-HEIGHT RATIO ===

    3:4 is most common (24 wide, 32 tall) Taller characters feel heroic Wider characters feel sturdy/heavy

    === SILHOUETTE TEST ===

    1. Fill sprite with solid color
    2. Is the character recognizable?
    3. Can you tell front from back?
    4. Can you see the pose clearly?
    5. Would you recognize them at 1x zoom?

    If any answer is NO, simplify the design.

    === DETAIL ALLOCATION ===

    For 32x32 character:

    • Head: 10-12 pixels (most detail budget)
    • Face: 4-6 pixels wide (eyes, mouth)
    • Torso: 8-10 pixels
    • Arms: Often 2-3 pixels wide
    • Legs: Often 3-4 pixels wide

    DON'T try to render fingernails on 2-pixel hands. Suggest detail, don't render it. */

  • name: Animation Frame Economy description: Achieve maximum impact with minimum frames when: Planning sprite animations example: | /* ANIMATION FRAME ECONOMY

    CONTRARIAN TRUTH: More frames often makes animation WORSE. Professional pixel art uses surprisingly few frames.

    === STANDARD FRAME COUNTS ===

    Idle: 2-4 frames

    • Subtle breathing/movement
    • 200-400ms per frame
    • Can loop or ping-pong

    Walk: 4-6 frames

    • Contact, Passing, Contact, Passing
    • 100-150ms per frame
    • 4 frames is often enough

    Run: 4-6 frames

    • Faster version of walk
    • 60-100ms per frame
    • May skip some walk in-betweens

    Jump: 3-4 frames

    • Anticipation, Rise, Fall, Land
    • Can loop rise/fall frames
    • Land often has recovery frame

    Attack: 3-5 frames

    • Windup (anticipation)
    • Strike (fastest, 1-2 frames)
    • Impact/Hold
    • Recovery

    Death: 3-6 frames

    • Recoil, Collapse, Rest
    • Often non-looping

    === WHY FEWER IS BETTER ===

    1. SNAPPINESS More frames = more time to complete action Fast actions need few frames or they feel slow

    2. CLARITY Each frame is visible longer Details have time to register

    3. WORKLOAD Half the frames = half the work Can polish remaining frames more

    4. CLASSIC FEEL Retro games had frame limits Fewer frames evokes that era

    === THE 4-FRAME WALK CYCLE ===

    Frame 1: Right foot forward (contact) Frame 2: Passing (weight shifting) Frame 3: Left foot forward (contact, mirror of 1) Frame 4: Passing (mirror of 2)

    That's it. This is all you need. 6-8 frames adds smoothness but isn't required.

    === ANTICIPATION IS KING ===

    Every good action has:

    1. ANTICIPATION (tells player what's coming)
    2. ACTION (the thing itself)
    3. FOLLOW-THROUGH (the recovery)

    A 3-frame attack with good anticipation FEELS better than a 6-frame attack with none. */

anti_patterns:

  • name: Pillow Shading description: Shading by darkening all edges uniformly why_bad: Creates flat, puffy look with no perceived depth or light direction instead: | Choose a consistent light source (usually top-left). Light-facing surfaces = highlights Away-facing surfaces = shadows Never shade edges uniformly.

  • name: Banding description: Parallel bands of color following the same path why_bad: Creates unintentional lines and patterns that distract instead: | Break up parallel color bands. Vary the length of color runs. Use dithering at transitions if needed. Sharp transitions are better than parallel bands.

  • name: Too Many Colors description: Adding colors for every slight variation why_bad: Destroys cohesion, makes palette management impossible instead: | Set hard palette limits BEFORE starting. 8-16 colors per character max. If adding a color, ask "can existing color work?" Reuse colors across multiple elements.

  • name: Mixed Pixel Scales description: Combining 1x and 2x pixels in same art why_bad: Instantly destroys visual cohesion, looks like asset flip instead: | Pick ONE pixel scale for entire project. All art must be at same pixel density. Never upscale half your assets.

  • name: Automatic Anti-Aliasing description: Using software smoothing on pixel art why_bad: Defeats the purpose of pixel art, creates blurry mess instead: | Disable all anti-aliasing in export. Use nearest-neighbor scaling only. Manual AA only where specifically needed.

  • name: Outline to Background AA description: Anti-aliasing sprite edges against a specific background why_bad: Creates ugly halos on different backgrounds instead: | Keep sprite edges hard (no AA to transparent). Or use alpha-only AA (semi-transparent, not color-mixed). Sprites should work on ANY background.

  • name: Frame Count Obsession description: Adding more frames hoping it improves animation why_bad: Often makes animation mushy and slow instead: | Focus on key poses, not in-betweens. 4 great frames beats 12 mediocre ones. Remove frames if animation feels slow.

  • name: Thin Protrusions description: Making arms, legs, appendages only 1 pixel wide why_bad: Impossible to shade, looks flat and flimsy instead: | Minimum 2 pixels wide for any appendage. 3+ pixels allows proper shading. Thickness gives dimension.

  • name: Insufficient Contrast description: Shades too similar to distinguish why_bad: Details disappear, shading becomes invisible instead: | Make shades instantly distinguishable. At least 20% lightness difference between steps. Test at 1x zoom - if you can't see it, neither can players.

  • name: Doubles in Lines description: Pixels that touch diagonally creating jagged lines why_bad: Creates dirty, unprofessional-looking linework instead: | Use "singles" - pixels in single-file diagonal. Clean curves use minimal pixels. Every pixel should serve the line's direction.

handoffs:

  • trigger: "animation system|state machine|blend tree" to: animation-systems priority: 1 context_template: "Pixel art needs animation system integration"

  • trigger: "character design|character concept|personality" to: character-design priority: 1 context_template: "Need character design before pixel art execution"

  • trigger: "game design|mechanics|gameplay" to: game-design priority: 2 context_template: "Pixel art needs gameplay context"

  • trigger: "UI|HUD|menu|interface" to: ui-design priority: 2 context_template: "Pixel art UI elements needed"

  • trigger: "3D|Unity|Unreal|Godot engine" to: game-design priority: 3 context_template: "Pixel art integration with game engine"