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๐ŸŽจ Creativity & Hobbies - Art

Enhancing Sketches with AI - Upgrading Your Drawings with GPT

Even stick figure sketches are OK! AI transforms your rough drawings into finished masterpieces.

Introduction

"AI drawing images is nice, but it's hard to express my ideas exactly..." Do you have this concern?

Then try this! Simply sketch the composition on paper and show it to AI. Then AI turns your rough drawing into a finished work. It's like drawing a base sketch and having a professional color it!

I was amazed when I learned this method. I know I can't draw well, but AI recognized even my stick-figure-level sketches and turned them into wonderful characters. You can even transform children's drawings into beautiful children's book illustrations.

This feature is really useful because showing with a sketch is much more accurate than just explaining with prompts. Rather than explaining "big tree on left, small house on right" a hundred times, just show a quick sketch and AI understands immediately.

Today, we'll learn how AI transforms your hand-drawn art into amazing works!

Types of AI Sketch Enhancement

1. Image to Image (Image Transformation)

  • Change style while maintaining your drawing's composition
  • Rough sketch โ†’ Finished illustration

2. ControlNet (Precise Control)

  • Accurate control based on line art
  • Perfectly preserves composition and form

3. Inpainting (Partial Editing)

  • Redraw only specific parts with AI
  • Fix mistakes

4. Upscaling (Resolution Enhancement)

  • Enlarge small images to high quality
  • Add details

Practice 1: Enhancing Sketches with DALLยทE 3

Method

  1. Draw simple sketch on paper
  2. Take photo with smartphone
  3. Upload to ChatGPT

Example Prompts

After Upload:

Transform this sketch into a finished watercolor illustration.
Use soft colors and warm feeling.

Or:

Convert this rough sketch into professional digital art.
With crisp lines and vivid colors.

Real Example

Sketch: Simple cat face drawing

Prompt:

Transform this rough cat sketch into a detailed digital illustration.
Add fur texture, expressive eyes, professional quality,
warm color palette, digital art style.

Korean:

Transform this rough cat sketch into detailed digital illustration.
Add fur texture, expressive eyes, professional quality,
warm color palette, digital art style.

Practice 2: Enhancing Sketches with MidJourney

Method

  1. Upload sketch image to Discord
  2. Copy image URL
  3. Use with /imagine command

Prompt Structure

/imagine [imageURL] [description] --iw [weight]

--iw (Image Weight) Setting:

  • --iw 0.5: Reference only (free interpretation)
  • --iw 1.0: Default (balanced)
  • --iw 2.0: Follow image strongly (maintain composition)

Examples

Basic Transformation:

[imageURL] professional digital art, detailed illustration,
vibrant colors --iw 1.5 --v 6

Style Specification:

[imageURL] watercolor painting style, soft colors,
artistic interpretation --iw 1.0 --v 6

Realistic Transformation:

[imageURL] realistic photography style,
high detail, professional quality --iw 2.0 --v 6

Practice 3: Stable Diffusion img2img

Requirements

  • Stable Diffusion WebUI installed
  • Or online service (Clipdrop, Playground AI)

Basic Settings

Denoising Strength:

  • 0.3-0.4: Nearly maintain original, slight improvement
  • 0.5-0.6: Balanced transformation (recommended)
  • 0.7-0.9: Reference composition only, major changes

Prompt Examples

Sketch โ†’ Realistic Image:

Positive: realistic photograph, detailed, high quality,
professional lighting, sharp focus

Negative: sketch, drawing, lines, rough, unfinished,
low quality, blurry

Sketch โ†’ Animation:

Positive: anime style, cel shaded, vibrant colors,
professional illustration, detailed

Negative: sketch lines, rough drawing, western cartoon,
realistic photo

Sketch โ†’ Watercolor:

Positive: watercolor painting, soft colors,
artistic brushstrokes, paper texture, traditional art

Negative: digital, photorealistic, sketch lines,
3D render

Practice 4: Using ControlNet (Advanced)

ControlNet colors precisely while following line art structure.

ControlNet Types

1. Canny Edge (Edge Detection)

  • Accurately recognizes line art boundaries
  • Precisely maintains composition

How to Use:

1. Activate ControlNet
2. Select Canny
3. Upload sketch image
4. Enter prompt

2. Scribble (Doodle โ†’ Artwork)

  • Recognizes even rough doodles
  • Freer interpretation

3. Lineart (Line Art Only)

  • Optimized for clean line art
  • Good for animation style

ControlNet Prompt Examples

Line Art โ†’ Color Illustration:

Positive: colorful illustration, anime style,
professional coloring, detailed shading,
vibrant colors, clean lineart

Negative: monochrome, sketch, unfinished,
messy lines, low quality

ControlNet: Lineart
Weight: 1.0

Practice 5: Leonardo.ai Image Guidance

Method

  1. Go to leonardo.ai
  2. Select "Image Generation"
  3. Activate "Image Guidance"
  4. Upload sketch

Settings

Strength:

  • Low: Reference sketch only
  • Medium: Recommended setting
  • High: Follow sketch strongly

Prompt Examples

Finish Fantasy Character Sketch:

Fantasy character, detailed armor, magical effects,
dramatic lighting, professional illustration,
concept art quality

Finish Landscape Sketch:

Beautiful landscape, detailed environment,
natural lighting, photorealistic quality,
high resolution

Step-by-Step Completion Process

Step 1: Rough Sketch

  • Simple sketch just establishing composition
  • Mark proportions and positions only

Step 2: Line Art (Optional)

  • Clean up with neat lines
  • More accurate with ControlNet

Step 3: AI Transformation

  • Specify desired style
  • First attempt conservatively

Step 4: Iterative Improvement

  • Adjust settings if not satisfied
  • Generate multiple versions and choose

Step 5: Post-processing

  • Fine-tune with Photoshop if needed
  • Improve resolution with Upscaling

Use Case Scenarios

Scenario 1: Idea Sketch โ†’ Finished Work

Situation: Doodle idea from head on paper

Process:

  1. 5-minute sketch on paper
  2. Take photo and upload to DALLยทE 3
  3. Request "turn this sketch into professional concept art"
  4. Finished work in 30 seconds!

Scenario 2: Child's Drawing โ†’ Beautiful Artwork

Situation: Commemorate child's drawing

Process:

  1. Scan child's drawing
  2. Upload to MidJourney
  3. Transform to children's book style
  4. Frame and gift

Prompt:

[childDrawingURL] children's book illustration,
colorful and magical, professional quality,
heartwarming style --iw 2.0

Scenario 3: Webtoon Artist Time Saving

Situation: No time to draw backgrounds

Process:

  1. Background rough sketch (3 minutes)
  2. Precise transformation with ControlNet
  3. AI colors over line art
  4. Final touch by hand

Tool Comparison

ToolDifficultyAccuracySpeedCost
DALLยทE 3โญโญโญโญโญโญโญ$20/month
MidJourneyโญโญโญโญโญโญโญโญโญ$10~/month
Stable DiffusionโญโญโญโญโญโญโญโญโญโญโญFree
Leonardo.aiโญโญโญโญโญโญโญโญโญFree/Paid

Tips Collection

Tip 1: Make Sketches Clear

  • Too complex confuses AI
  • Mark main shapes clearly only

Tip 2: Provide Reference Images Together

"Finish this sketch. I've also attached reference style images."

Tip 3: Progress Step by Step

  1. First check composition
  2. Apply style
  3. Add details

Tip 4: Generate Multiple Versions

  • Generate 4-5 at once
  • Choose the best one

Tip 5: Divide by Parts

  • Divide complex images by parts
  • Composite later

Common Mistakes

Mistake 1: Sketch Too Complex

Problem: Too many details confuse AI Solution: Main shapes simply only

Mistake 2: Sketch Too Small

Problem: Low resolution input โ†’ Low quality output Solution: Minimum 512x512 or larger

Mistake 3: Upload Without Prompt

Problem: AI doesn't know intention Solution: Clearly explain style and intention

Mistake 4: Satisfied with First Result

Problem: Miss better results Solution: Try at least 3-4 times

Practice Assignments

Assignment 1: Complete Your Character

  1. Sketch character on paper
  2. Transform to 3 different styles with AI
  3. Choose favorite

Assignment 2: Idea โ†’ Work

  1. Simply sketch idea from head
  2. Make into professional work with AI
  3. Before/after comparison

Assignment 3: Style Experiment

  1. Same sketch
  2. In 4 styles: watercolor, oil, digital, animation
  3. Compare style differences

Recommended Workflow

Beginner Workflow

1. Start with DALLยทE 3
2. Simple prompts
3. Regenerate until satisfied

Intermediate Workflow

1. MidJourney img2img
2. Adjust --iw value
3. Utilize Vary (Subtle/Strong)

Advanced Workflow

1. Stable Diffusion + ControlNet
2. Precise parameter adjustment
3. Photoshop post-processing
4. AI Upscaling

Useful Online Tools

Free Tools

  • Clipdrop: Simple img2img
  • Playground AI: Provides free credits
  • Lexica: Style reference gallery

Paid Tools

  • Topaz Gigapixel AI: Best upscaling
  • Photoshop AI: Professional editing
  • Krita AI Plugin: Free drawing tool + AI

Conclusion

Enhancing sketches with AI lowers the barrier to creation. Even without drawing skills, you can create amazing works with just ideas!

In the next post, we'll learn how to design posters and logos with AI.

๐Ÿ’ก Today's Tip: When sketching, using light blue pen instead of black helps AI recognize lines better!

๋‹ค์Œ ๊ธ€

Designing Posters & Logos with AI - ChatGPT Graphic Design Guide

Save on designer fees! From club posters to personal brand logos, create professional-level designs with AI.