Loss of colour detail for downscaled images

[plaes]

Bug report

Upload an image and observe colours for downscaled images.

Steps to reproduce

1. Upload Image
2. View image in browser
3. Compare colours with downloaded original

Expected behaviour

Both images look the same.

Actual behaviour

Some of the colour detail seems to be lost for downscaled images (left side: original downloaded image, right side: downscaled image)

Apparently the jpg files contain a color profile (converted from Canon Raw image using Adobe Lightning (CS?)): http://www.exiv2.org/tags-xmp-crs.html

Server configuration

Server configuration detail

Operating system: Linux 4.13.0-0.bpo.1-amd64 #1 SMP Debian 4.13.13-1~bpo9+1 (2017-11-22) x86_64

Webserver: nginx/1.10.3 (fpm-fcgi)

Database: sqlite3 3.16.2

PHP version: 7.0.19-1
Modules loaded: Core, date, libxml, openssl, pcre, zlib, filter, hash, Reflection, SPL, session, standard, cgi-fcgi, PDO, xml, calendar, ctype, curl, dom, mbstring, fileinfo, ftp, gd, gettext, iconv, igbinary, json, exif, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, readline, redis, shmop, SimpleXML, sockets, sqlite3, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xmlreader, xmlwriter, xsl, zip, Zend OPcache

Nextcloud version: 12.0.4 - 12.0.4.3

Updated from an older Nextcloud/ownCloud or fresh install: updated from older 12.0.x

Where did you install Nextcloud from: manual install

Signing status

Array

List of activated apps

Enabled:
 - activity: 2.5.2
 - bruteforcesettings: 1.0.3
 - calendar: 1.5.7
 - comments: 1.2.0
 - dav: 1.3.0
 - deck: 0.2.8
 - federatedfilesharing: 1.2.0
 - federation: 1.2.0
 - files: 1.7.2
 - files_pdfviewer: 1.1.1
 - files_sharing: 1.4.0
 - files_texteditor: 2.4.1
 - files_trashbin: 1.2.0
 - files_versions: 1.5.0
 - files_videoplayer: 1.1.0
 - firstrunwizard: 2.1
 - gallery: 17.0.0
 - issuetemplate: 0.3.0
 - logreader: 2.0.0
 - lookup_server_connector: 1.0.0
 - metadata: 0.6.0
 - nextcloud_announcements: 1.1
 - notifications: 2.0.0
 - oauth2: 1.0.5
 - password_policy: 1.2.2
 - provisioning_api: 1.2.0
 - serverinfo: 1.2.0
 - sharebymail: 1.2.0
 - survey_client: 1.0.0
 - systemtags: 1.2.0
 - theming: 1.3.0
 - twofactor_backupcodes: 1.1.1
 - twofactor_u2f: 1.4.0
 - updatenotification: 1.2.0
 - workflowengine: 1.2.0
Disabled:
 - admin_audit
 - encryption
 - files_external
 - user_external
 - user_ldap

Configuration (config/config.php)

{
    "instanceid": "oc5b2vj7qs8s",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "XXX",
        "qnap.local"
    ],
    "datadirectory": "\/srv\/nextcloud\/data",
    "overwrite.cli.url": "XXX",
    "dbtype": "sqlite3",
    "version": "12.0.4.3",
    "installed": true,
    "maintenance": false,
    "theme": "",
    "loglevel": 2,
    "updater.release.channel": "stable",
    "memcache.local": "\\OC\\Memcache\\Redis",
    "memcache.locking": "\\OC\\Memcache\\Redis",
    "redis": {
        "host": "\/var\/run\/redis\/redis.sock",
        "port": 0
    }
}

Are you using encryption: no

Client configuration

Browser: Firefox/Chrome/Safari

Operating system: Fedora 27 / Mac OS X High Sierra / Android 7

[JimboJoe]

I confirm I have the same issue on NextCloud 13.0.2.
Switching the color profile (when exporting from LightRoom) from ProPhoto RGB to sRGB fixed the rendering problem for me.

[plaes]

Confirming that sRGB works better :)

[lazka]

Still the same problem with nextcloud 17. Does anyone know a workaround (that doesn't involve changing the images)?