Astrophotography Processing Tool

Astrophotography Image Enhancer

Upload a JPG or PNG and apply a browser-based enhancement workflow inspired by your Python post-processing script. This tool performs percentile stretching, star softening, large-scale structure enhancement, and sharpening.

100% Browser-based

JPG/PNG Input formats

Live Adjustable controls

PNG Download output

Controls

Choose an image, adjust the enhancement settings, then process and download the result.

Upload image

No image loaded yet.

Presets

Use one of these beginner-friendly starting points, then fine-tune the sliders if needed.

Stretch

Low percentile 1.5 High percentile 99.6

Background Reduction

Reduction amount 0

Noise Reduction

Reduction amount 0

Star Reduction Approximation

Small blur radius 0.8 Blur blend 0.2

Galaxy / Nebula Structure

Large blur radius 14 Enhancement strength 0.85

Tone Mapping

Highlight compression 0.25

Sharpen

Sharpen radius 1 Sharpen amount 0.6 Threshold 0.03

Finishing

Brightness 0 Contrast 1 Saturation 1

Preview

Load an image to begin.

Original

Enhanced

What this tool does

Stretches faint detail using low/high percentile clipping.
Softens stars slightly by blending the image with a small blur.
Boosts larger structures by subtracting a large-scale blur.
Applies thresholded sharpening to bring back local detail.

This version is optimized for web-friendly preview workflows. It works best on exported astrophotography images rather than raw FITS or stacked calibration files.