Image generation pillow

Skill cxcscmu/SkillLearnBench/skills/b1-one-shot-gemini-3-flash-preview/anthropic-poster-design/image-generation-pillow

[COLM'26] SkillLearnBench is the first benchmark for evaluating continual learning methods that automatically generate agent skills.

Install

npx -y skills add cxcscmu/SkillLearnBench --skill image-generation-pillow

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Technical image generation using Python's Pillow library. Use this when you need to programmatically create diagrams, posters, or technical drawings.

SKILL.md

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Overview

Pillow (PIL) is a robust library for image processing and creation in Python. It's ideal for generating technical diagrams, exploded views, and annotated posters.

Installation

Ensure Pillow is installed in your environment:

pip install Pillow

Usage Patterns

Basic Canvas Setup

from PIL import Image, ImageDraw, ImageFont

# Create a blank canvas
width, height = 1200, 1600
background_color = (250, 249, 245)  # Anthropic Identity Light
image = Image.new('RGB', (width, height), background_color)
draw = ImageDraw.Draw(image)

Drawing Technical Shapes

Use draw.polygon, draw.rectangle, and draw.line to create exploded views. Parallelograms can represent layered hardware components.

def draw_hardware_layer(draw, top_left, size, color, offset=20):
    # top_left: (x, y)
    # size: (w, h)
    # color: (r, g, b)
    # Draw a 3D-like box
    x, y = top_left
    w, h = size
    # Base rectangle
    draw.rectangle([x, y, x + w, y + h], fill=color, outline=(20, 20, 19), width=2)

Exploded View Strategy

To create an exploded view, stack layers vertically with a consistent Y-offset and use leader lines for annotations.

layers = [
    {"name": "Casing", "color": (20, 20, 19)},
    {"name": "Thermal Unit", "color": (106, 155, 204)},
    {"name": "PCB", "color": (120, 140, 93)},
    {"name": "Battery", "color": (176, 174, 165)},
    {"name": "Interface", "color": (217, 119, 87)}
]

for i, layer in enumerate(layers):
    draw_hardware_layer(draw, (300, 200 + i * 200), (600, 100), layer['color'])

Annotations and Typography

# Load a font (ensure the font file exists or use a default)
try:
    font_heading = ImageFont.truetype("Poppins-Bold.ttf", 48)
except:
    font_heading = ImageFont.load_default()

draw.text((50, 50), "NOVA", fill=(20, 20, 19), font=font_heading)

Best Practices

Use high DPI (e.g., 300) for print-quality posters (multiply width/height accordingly).
Use ImageDraw.line with specific widths for leader lines.
Antialias lines by drawing at 2x size and resizing down.