nextcloud/server

Color management support

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#22,951 opened on Sep 18, 2020

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 (19 comments) (24 reactions) (0 assignees)PHP (4,865 forks)batch import
0. Needs triageenhancementfeature: previews and thumbnailshelp wanted

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Description

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ICC profiles of photos are ignored. If photos have an Adobe RGB profile, they are displayed too pale. All previews are displayed incorrectly: in Files, Photos and Viewer. The previews/thumbnails should have the same ICC profile as the original photos. Until now, the preview images lose their ICC profile.

Here is an example in Viewer. The first photo has an sRGB profile. For the second photo, the profile of the photo was converted to an Adobe RGB profile.

srgb argb

Background: More and more cameras are recording with the Adobe RGB profile, which is significantly larger in terms of color gamut. If photos with an Adobe RGB profile are used in Nextcloud, they are displayed incorrectly.

Contributor guide

Research direction
Investigate how Nextcloud generates thumbnails and previews; inspect the image processing pipeline to identify where ICC profiles are dropped. Implement reading and applying ICC profiles during thumbnail generation.
Tech stack
php
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
PHP
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40