fal.ai Upscale

Upscale and enhance image resolution using state-of-the-art AI models.

How It Works

1. User provides image URL and optional scale factor
2. Script selects appropriate upscaling model
3. Sends request to fal.ai API
4. Returns upscaled image URL

Image Upscale Models

Video Upscale Models

Usage

bash /mnt/skills/user/fal-upscale/scripts/upscale.sh [options]

Arguments:

• --image-url – URL of image to upscale (required)
• --model – Model ID (defaults to fal-ai/aura-sr)
• --scale – Upscale factor: 2 or 4 (default: 4)

Examples:

# Image upscale with AuraSR (4x, fast)
bash /mnt/skills/user/fal-upscale/scripts/upscale.sh \
  --image-url "https://example.com/image.jpg"

# Image upscale with Clarity (detail preservation)
bash /mnt/skills/user/fal-upscale/scripts/upscale.sh \
  --image-url "https://example.com/image.jpg" \
  --model "fal-ai/clarity-upscaler" \
  --scale 2

# Video upscale (general purpose)
bash /mnt/skills/user/fal-upscale/scripts/upscale.sh \
  --video-url "https://example.com/video.mp4" \
  --model "fal-ai/video-upscaler"

# Video upscale (premium quality)
bash /mnt/skills/user/fal-upscale/scripts/upscale.sh \
  --video-url "https://example.com/video.mp4" \
  --model "fal-ai/topaz/upscale/video"

MCP Tool Alternative

If MCP tools are available, prefer using:

mcp__fal-ai__generate({
  modelId: "fal-ai/aura-sr",
  input: {
    image_url: "https://example.com/image.jpg"
  }
})

Output

Upscaling with fal-ai/aura-sr...
Upscale complete!

Image URL: https://v3.fal.media/files/abc123/upscaled.png
Original: 512x512
Upscaled: 2048x2048

JSON output:

{
  "image": {
    "url": "https://v3.fal.media/files/abc123/upscaled.png",
    "width": 2048,
    "height": 2048
  }
}

Present Results to User

Here's your upscaled image:

![Upscaled Image](https://v3.fal.media/files/...)

• 512×512 → 2048×2048 (4x)

Model Selection Guide

AuraSR (fal-ai/aura-sr)

• Best for: Quick upscaling, general images
• Speed: ~2 seconds
• Fixed 4x scale

Clarity Upscaler (fal-ai/clarity-upscaler)

• Best for: Preserving fine details
• Speed: ~5 seconds
• Configurable scale (2x or 4x)

Creative Upscaler (fal-ai/creative-upscaler)

• Best for: Adding artistic detail
• Speed: ~10 seconds
• Enhances while upscaling

Troubleshooting

API Key Error

Error: FAL_KEY environment variable not set

To fix:
1. Get your API key from https://fal.ai/dashboard/keys
2. Set: export FAL_KEY=your_key_here

Image URL Error

Error: Could not fetch image from URL

Make sure:
1. The image URL is publicly accessible
2. The URL points directly to an image file
3. The image format is supported (JPEG, PNG, WebP)

Network Error

Network error. To fix on claude.ai:

1. Go to https://claude.ai/settings/capabilities
2. Add *.fal.ai to the allowed domains
3. Try again