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{
"source": "github.com/fal-ai-community/skills/tree/main/skills/claude.ai/fal-upscale",
"type": "github-subdir",
"installed_at": "2026-01-30T02:27:22.240860959Z",
"repo_url": "https://github.com/fal-ai-community/skills.git",
"subdir": "skills/claude.ai/fal-upscale",
"version": "69efe6e"
}

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fal-upscale/SKILL.md Normal file
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---
name: fal-upscale
description: Upscale and enhance image resolution using AI. Use when the user requests "Upscale image", "Enhance resolution", "Make image bigger", "Increase quality", or similar upscaling tasks.
metadata:
author: fal-ai
version: "1.0.0"
---
# 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
| Model | Scale | Best For |
|-------|-------|----------|
| `fal-ai/aura-sr` | 4x | General upscaling, fast |
| `fal-ai/clarity-upscaler` | 2-4x | Detail preservation |
| `fal-ai/creative-upscaler` | 2-4x | Creative enhancement |
## Video Upscale Models
| Model | Notes |
|-------|-------|
| `fal-ai/video-upscaler` | General purpose |
| `fal-ai/topaz/upscale/video` | **Premium quality** |
| `fal-ai/bria/video/increase-resolution` | Fast |
| `fal-ai/flashvsr` | Real-time |
| `fal-ai/seedvr/upscale/video` | High fidelity |
| `fal-ai/bytedance-upscaler` | Good balance |
| `fal-ai/simalabs/sima-video-upscaler-lite` | Lightweight |
## Usage
```bash
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:**
```bash
# 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:
```json
{
"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
```

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fal-upscale/scripts/upscale.sh Executable file
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#!/bin/bash
# fal.ai Upscale Script
# Usage: ./upscale.sh --image-url URL [--model MODEL] [--scale SCALE]
# Returns: JSON with upscaled image URL
set -e
FAL_API_ENDPOINT="https://fal.run"
# Default values
MODEL="fal-ai/aura-sr"
IMAGE_URL=""
SCALE=4
# Check for --add-fal-key first
for arg in "$@"; do
if [ "$arg" = "--add-fal-key" ]; then
shift
KEY_VALUE=""
if [[ -n "$1" && ! "$1" =~ ^-- ]]; then
KEY_VALUE="$1"
fi
if [ -z "$KEY_VALUE" ]; then
echo "Enter your fal.ai API key:" >&2
read -r KEY_VALUE
fi
if [ -n "$KEY_VALUE" ]; then
grep -v "^FAL_KEY=" .env > .env.tmp 2>/dev/null || true
mv .env.tmp .env 2>/dev/null || true
echo "FAL_KEY=$KEY_VALUE" >> .env
echo "FAL_KEY saved to .env" >&2
fi
exit 0
fi
done
# Load .env if exists
if [ -f ".env" ]; then
source .env 2>/dev/null || true
fi
# Parse arguments
while [[ $# -gt 0 ]]; do
case $1 in
--image-url)
IMAGE_URL="$2"
shift 2
;;
--model)
MODEL="$2"
shift 2
;;
--scale)
SCALE="$2"
shift 2
;;
--help|-h)
echo "fal.ai Upscale Script" >&2
echo "" >&2
echo "Usage:" >&2
echo " ./upscale.sh --image-url URL [options]" >&2
echo "" >&2
echo "Options:" >&2
echo " --image-url Image URL to upscale (required)" >&2
echo " --model Model ID (default: fal-ai/aura-sr)" >&2
echo " --scale Scale factor (default: 4)" >&2
echo " --add-fal-key Setup FAL_KEY in .env" >&2
exit 0
;;
*)
shift
;;
esac
done
# Validate required inputs
if [ -z "$FAL_KEY" ]; then
echo "Error: FAL_KEY not set" >&2
echo "" >&2
echo "Run: ./upscale.sh --add-fal-key" >&2
echo "Or: export FAL_KEY=your_key_here" >&2
exit 1
fi
if [ -z "$IMAGE_URL" ]; then
echo "Error: --image-url is required" >&2
exit 1
fi
# Create temp directory
TEMP_DIR=$(mktemp -d)
trap 'rm -rf "$TEMP_DIR"' EXIT
echo "Upscaling with $MODEL..." >&2
# Build payload based on model
if [[ "$MODEL" == *"aura-sr"* ]]; then
# AuraSR has fixed 4x scale
PAYLOAD=$(cat <<EOF
{
"image_url": "$IMAGE_URL"
}
EOF
)
else
# Other models support scale parameter
PAYLOAD=$(cat <<EOF
{
"image_url": "$IMAGE_URL",
"scale": $SCALE
}
EOF
)
fi
# Make API request
RESPONSE=$(curl -s -X POST "$FAL_API_ENDPOINT/$MODEL" \
-H "Authorization: Key $FAL_KEY" \
-H "Content-Type: application/json" \
-d "$PAYLOAD")
# Check for errors
if echo "$RESPONSE" | grep -q '"error"'; then
ERROR_MSG=$(echo "$RESPONSE" | grep -o '"message":"[^"]*"' | head -1 | cut -d'"' -f4)
if [ -z "$ERROR_MSG" ]; then
ERROR_MSG=$(echo "$RESPONSE" | grep -o '"error":"[^"]*"' | cut -d'"' -f4)
fi
echo "Error: $ERROR_MSG" >&2
exit 1
fi
echo "Upscale complete!" >&2
echo "" >&2
# Extract and display result
OUTPUT_URL=$(echo "$RESPONSE" | grep -o '"url":"[^"]*"' | head -1 | cut -d'"' -f4)
echo "Image URL: $OUTPUT_URL" >&2
# Output JSON for programmatic use
echo "$RESPONSE"