A camera-like response for telescope fields: Neutral's toe crushes faint values next to bright ones
Maintainers usually reply within 1 day
Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 45/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- javascript
- Domain
- computer-graphics
Research direction
Start with the linked js/scene/HDR.md section, then inspect the scene’s linear-HDR compositing and Neutral tone-mapping path; the issue does not name the implementation files or tests. Compare the #192 views with the proposed camera response enabled and disabled, and verify the crescent, earthlit Moon and HIP 46635 ratios while the existing star-calibration probe remains unchanged.
Written by the indexing model from the issue text.
Description
Follow-up of #192, recorded in HDR.md, a star beside the Moon.
Problem
The scene buffer is linear HDR and ends in one tone map, PBR Neutral, whose quadratic toe is calibrated to the eye (the limit star sits at 12 of 255). For a telescope's field of a bright source and faint ones together, the toe takes the faint values far below where a camera's response puts them. At the occultation view (#192, ev=10): the earthlit side of the Moon against HIP 46635 is about 1:3 in light, and on screen 20 against 175. With the lit edge in the frame the Moon holds the meter and the star, 1/274 of a lit pixel at #198's 1.8″ pixels, is under the toe. The photographs show both.
Proposal
A camera response beside the eye's, not a change to it: composite in linear light and end in a camera's curve (a filmic/sRGB-like response with a linear toe) rather than Neutral's toe, for a telescope's field or as a switch (a letter in s= and a Settings entry, like the other view switches). The eye's calibration of the star field (the limit star at 12 of 255) is the toe's, so the eye stays the default.
Done when
At #192's views the crescent, the earthlit side and HIP 46635 keep their ratios on screen as a camera records them, with the switch on; with it off, nothing changes (the star calibration probe of #153 is unchanged).
Related: #192, #109, #155 (telescope mode), #163 (the moonlit sky), veiling glare (HDR.md, pre-exposure).
- Dominant language
- JavaScript
- Stars
- 55
- Forks
- 4
- Avg merge
- 9h 32m
- Merged PRs (30d)
- 136
Getting set up
This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
More from celestiary/web
-
Difficulty 1/5 Under an hour Newbie friendliness 88/100
celestiary/web#345 ·
Maintainers usually reply within 1 day
-
Cesium guest (?cesium=iframe): white flicker near Mars's and Earth's surface remains after #335Open
Difficulty 4/5 3-5 days Newbie friendliness 35/100
celestiary/web#344 ·
Maintainers usually reply within 1 day
-
Difficulty 5/5 Over a week Newbie friendliness 25/100
celestiary/web#340 ·
Maintainers usually reply within 1 day
-
Show the instrument's pixel on the sky: a marker at Rubin's resolution beside the targetPossibly taken @pablo-mayrgundter claimed this 1 day ago. Open
Difficulty 4/5 3-5 days Newbie friendliness 35/100
celestiary/web#339 ·
Maintainers usually reply within 1 day
-
Difficulty 4/5 1-2 days Newbie friendliness 48/100
celestiary/web#336 ·
Maintainers usually reply within 1 day
Similar issues
-
Difficulty 1/5 Under an hour Newbie friendliness 88/100
Maintainers usually reply within 1 day
-
help wanted
Difficulty 2/5 1-3 hours Newbie friendliness 77/100
Aethelgard-Systems/agent-postbox#32 ·
Maintainers usually reply within 1 day
-
Difficulty 2/5 1-3 hours Newbie friendliness 76/100
Maintainers usually reply within 1 day
-
Difficulty 2/5 1-3 hours Newbie friendliness 78/100
SamuelNDCE/plume#42 ·
Maintainers usually reply within 1 day
-
[UI] Theme Provider Props table overflows on mobile viewportsPossibly taken @SajanBisht claimed this today. Openframework/gatsby help wanted kind/bug
Difficulty 2/5 1-3 hours Newbie friendliness 78/100
layer5io/layer5#8264 · 1 comment ·
Maintainers usually reply within 3 days