Apply atmosphere overlay ON TOP of moon, add overcast fallback
The core mental model was wrong: clouds are between the observer and
the moon, so they occlude the disk — they don't sit behind it.
moon_composite.py:
_make_east_sky_backdrop() → _make_atmosphere_layer()
render_phase_closeup() pipeline is now:
1. Black background
2. NASA moon disk centred (correct phase / libration / shadows)
3. East frame scaled + blurred → composited OVER the disk at
atmosphere_opacity (0.0 = clear, 0.68 = heavy overcast)
Parameters: east_sky_enabled/blur → atmosphere_opacity/blur
moon_phase_monthly.py:
_atmosphere_opacity_from_quality() maps detection quality to opacity:
quality >= 0.85 → 0.00 (clear)
quality 0.70 → 0.20 (light haze)
quality 0.55 → 0.40 (notable cloud, still detected)
quality None → 0.68 (no detection, heavy overcast)
Frame scan now tracks two lists:
qualifying — frames passing quality + illumination (existing)
above_horizon — frames where moon is up but detection failed
When qualifying is empty and MOON_CLOUDY_POST_ENABLED=true, the
above-horizon frame closest to the exact phase moment is used with
opacity 0.45–0.68. The month is always represented — full moon,
first quarter, and third quarter each get a post even in cloudy
months, showing the moon as a faint glow behind cloud.
sky-cam.conf:
MOON_EAST_SKY_ENABLED/BLUR → MOON_ATMOSPHERE_BLUR (opacity is
computed automatically from quality, not configured directly)
New: MOON_CLOUDY_POST_ENABLED=true
test_moon_composite.py:
Generates three outputs at opacity 0.00 / 0.20 / 0.65 so the
full opacity range is visible in one test run.
https://claude.ai/code/session_01HkTxpNSTWtViZzxbrbKytR
This commit is contained in:
Claude
+62
-74
@@ -1,72 +1,64 @@
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#!/usr/bin/env python3
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"""test_moon_composite.py — smoke-test the east-sky-backdrop composite.
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"""test_moon_composite.py — smoke-test atmospheric overlay at three opacity levels.
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Uses the sample east frame (21-07-00.jpg) already in the repo and a
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procedurally generated moon disc (no camera timestamp, no copyright) to
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demonstrate the east-sky backdrop without needing a live NASA API call.
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Generates three output images from the same east camera frame (21-07-00.jpg)
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to show how the atmospheric overlay looks across the quality spectrum:
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test_composite_clear.jpg — opacity 0.00 (quality ≥ 0.85, clear sky)
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test_composite_hazy.jpg — opacity 0.20 (quality ~ 0.70, light haze)
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test_composite_cloudy.jpg — opacity 0.65 (overcast fallback)
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The moon disk in each image is procedurally generated (clean grey sphere,
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no camera timestamp). In production it is replaced by the NASA SVS
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Dial-a-Moon render for the exact UTC hour east captured the moon.
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Run from the sky-cam directory:
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python3 test_moon_composite.py
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Output: test_composite_out.jpg
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The east frame (2026-04-29 21:06:45) shows the moon through visible thin
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cloud cover; that sky — blurred to atmospheric haze — becomes the backdrop
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behind the procedural moon disc. In production the disc is replaced by the
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NASA SVS Dial-a-Moon render for the exact UTC hour east captured the moon.
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"""
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import os
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import pathlib
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import sys
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from datetime import datetime, timezone
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import tempfile
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HERE = pathlib.Path(__file__).resolve().parent
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sys.path.insert(0, str(HERE))
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EAST_FRAME = HERE / '21-07-00.jpg'
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OUT_PATH = HERE / 'test_composite_out.jpg'
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CASES = [
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('test_composite_clear.jpg', 0.00, 'clear sky (quality >= 0.85)'),
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('test_composite_hazy.jpg', 0.20, 'light haze (quality ~ 0.70)'),
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('test_composite_cloudy.jpg', 0.65, 'heavy overcast fallback'),
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]
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def _make_procedural_moon(size: int = 2048) -> 'Image':
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"""Generate a clean grey disc that stands in for a NASA Dial-a-Moon render.
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Draws a base disc, a few darker ellipses for lunar maria, and a subtle
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limb-darkening gradient. No timestamp, no copyright, no camera artefacts.
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"""
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"""Clean grey disc with simplified lunar maria and limb darkening."""
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from PIL import Image, ImageDraw, ImageFilter
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import numpy as np
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img = Image.new('RGB', (size, size), (0, 0, 0))
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draw = ImageDraw.Draw(img)
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cx = cy = size // 2
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r = int(size * 0.47)
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# Base disc — warm grey, slightly off-white like a real moon
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draw.ellipse([cx - r, cy - r, cx + r, cy + r], fill=(218, 214, 200))
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# A few darker patches suggesting the major maria
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draw.ellipse([cx - r//3, cy - r//3, cx + r//6, cy + r//5], fill=(170, 167, 154))
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draw.ellipse([cx + r//8, cy - r//5, cx + r//3, cy + r//8], fill=(182, 179, 166))
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draw.ellipse([cx - r//4, cy + r//6, cx + r//8, cy + r//3], fill=(175, 172, 159))
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draw.ellipse([cx - r//2, cy - r//10, cx - r//5, cy + r//4], fill=(185, 182, 169))
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# Smooth the hard edges so it blends naturally
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img = img.filter(ImageFilter.GaussianBlur(radius=size // 80))
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# Subtle limb darkening: blend a radial dark vignette at the disc edge
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vignette = Image.new('L', (size, size), 0)
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vd = ImageDraw.Draw(vignette)
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vd.ellipse([cx - r, cy - r, cx + r, cy + r], fill=255)
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vignette = vignette.filter(ImageFilter.GaussianBlur(radius=size // 30))
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import numpy as np
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arr = np.asarray(img).astype(float)
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vig = np.asarray(vignette).astype(float) / 255.0
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# Darken towards the limb (where vig is small → near edge)
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darken = 0.75 + 0.25 * vig # 0.75 at edge, 1.0 at centre
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arr = np.clip(arr * darken[..., None], 0, 255).astype('uint8')
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img = Image.fromarray(arr)
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return img
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arr = np.asarray(img).astype(float)
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vig = np.asarray(vignette).astype(float) / 255.0
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arr = np.clip(arr * (0.75 + 0.25 * vig)[..., None], 0, 255).astype('uint8')
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return Image.fromarray(arr)
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def main():
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@@ -74,53 +66,49 @@ def main():
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print(f'ERROR: missing {EAST_FRAME}', file=sys.stderr)
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sys.exit(1)
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# Save the procedural disc to a temp file so render_phase_closeup can open it
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import tempfile, os
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with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as tf:
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tmp_moon = tf.name
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print('generating procedural moon disc …')
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moon_img = _make_procedural_moon(2048)
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tmp = tempfile.NamedTemporaryFile(suffix='.png', delete=False)
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tmp_moon = tmp.name
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tmp.close()
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moon_img.save(tmp_moon)
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from moon_composite import render_phase_closeup
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try:
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print('=== moon composite smoke-test ===')
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print(f'east frame : {EAST_FRAME.name}')
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print(f'moon disc : procedural (NASA Dial-a-Moon stand-in)')
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print(f'output : {OUT_PATH.name}')
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print()
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print('generating procedural moon disc …')
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moon_img = _make_procedural_moon(2048)
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moon_img.save(tmp_moon)
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from moon_composite import render_phase_closeup
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caption = (
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'Full Moon — April 2026 — '
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'sky-cam east witnessed at 2026-04-29 21:07:00 UTC '
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'(+7 min from exact full) — render: NASA SVS Dial-a-Moon'
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)
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print('rendering composite with east sky backdrop …')
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render_phase_closeup(
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nasa_render_path=tmp_moon,
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out_path=str(OUT_PATH),
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output_size=(1920, 1080),
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moon_height_pct=0.88,
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caption=caption,
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east_frame_path=str(EAST_FRAME),
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east_sky_enabled=True,
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east_sky_blur=0, # auto: output_width / 6 = 320 px
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)
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for filename, opacity, label in CASES:
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out = HERE / filename
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caption = (
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f'Full Moon — April 2026 — '
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f'sky-cam east 2026-04-29 21:07 UTC — '
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f'NASA SVS Dial-a-Moon [{label}]'
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)
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print(f'rendering {filename} (opacity={opacity:.2f}) {label} …')
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render_phase_closeup(
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nasa_render_path=tmp_moon,
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out_path=str(out),
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output_size=(1920, 1080),
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moon_height_pct=0.88,
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caption=caption,
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east_frame_path=str(EAST_FRAME),
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atmosphere_opacity=opacity,
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atmosphere_blur=0,
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)
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print(f' -> {out}')
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finally:
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os.unlink(tmp_moon)
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print(f'\ndone → {OUT_PATH}')
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print()
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print('What you should see:')
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print(' • Background: east’s April 29 night sky, blurred to soft atmospheric haze')
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print(' (thin cloud cover visible as a grey-blue gradient, treeline at bottom)')
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print(' • Moon disc filling ~88% of the 1920×1080 frame, pasted sharp on top')
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print(' • Caption at bottom-left with phase / date / witness text')
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print('done. Three outputs:')
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for filename, opacity, label in CASES:
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print(f' {filename:35s} opacity={opacity:.2f} {label}')
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print()
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print('In production the procedural disc is replaced by the NASA SVS Dial-a-Moon')
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print('render for that exact UTC hour — same layout, real crater detail.')
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print('What you should see in each:')
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print(' clear — NASA moon disk sharp and unobscured on black background')
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print(' hazy — same moon but with a soft grey-blue veil over the disk')
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print(' (from the thin cloud visible in 21-07-00.jpg)')
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print(' cloudy — moon mostly hidden; visible as a bright glow through')
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print(' the cloud texture from east\'s April 29 frame')
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if __name__ == '__main__':
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