Beyond the Catalog: Gloomia's Scheduler, Filters, and Photo Wallpaper Mode
Most of what gets written about Gloomia, including a fair amount of what has run on this blog, is about the wallpaper catalog itself: which of the twenty scenes is calmest to work in front of, which one reacts to music, which one is pulling real data from NASA. That focus makes sense, the catalog is the part of Gloomia most people open the app to see. But it is not the only thing sitting inside the settings, and three features that live underneath the catalog rarely come up at all: a Scheduler that rotates which wallpaper shows across the day, visual filters that layer over any scene you already have assigned, and a Photo Wallpaper mode that turns your own photos into a slow, gentle slideshow instead of running one of Gloomia's animated scenes at all.
None of these three depend on any single wallpaper. They sit alongside the catalog rather than inside it, which is probably exactly why they are easy to miss the first time you install the app and go straight to picking a scene. This post walks through what each one actually does, grounded only in what is confirmed about Gloomia, plus the general background you need to understand two of the more specific terms involved: the Ken Burns effect and DLNA.
The Scheduler: one wallpaper for morning, a different one for night
The core idea behind the Scheduler is simple to state: it lets you pick which wallpaper shows across the day, so your desktop is not locked to a single scene from the moment you log in until the moment you shut the machine down. Instead of choosing one wallpaper and living with it around the clock, the Scheduler is the feature that lets the choice change on its own as the day moves along.
This matters most for anyone who has ever wanted two different things out of a desktop depending on the hour. A wallpaper that feels right at nine in the morning, something calm and unobtrusive while you are trying to focus, is not necessarily the one you want running at eleven at night when the point of your desktop has shifted from "stay out of the way" to "actually look at something nice for a minute." Rather than manually swapping wallpapers by hand every time that shift happens, the Scheduler is built to handle that rotation for you.
If you have already read about running which Gloomia wallpapers actually stay out of your way while you work, the Scheduler is the feature that turns that idea from a single fixed choice into something that can change shape across the day without you doing anything after the initial setup. A calm wallpaper for work hours and a livelier one for evenings are no longer a tradeoff you have to pick between, they can both be true on the same desktop at different times.
Filters: changing the look without changing the wallpaper
Visual filters are a separate feature from the Scheduler, and a separate feature from the wallpapers themselves. Where the Scheduler decides which wallpaper is running, filters change what that wallpaper looks like once it is running, and they can be layered over any wallpaper in the catalog rather than being tied to one specific scene.
The practical effect is that a filter is not a new wallpaper, it is a treatment applied on top of whichever one you already have. That distinction is worth being precise about, because it means the same underlying scene, the same animation, the same behavior, can end up looking noticeably different depending on whether a filter is layered over it, without Gloomia having built a second version of that wallpaper to get there. It is the same relationship a photo filter has to the photo underneath it: the picture has not changed, only how it reads has.
Because filters sit on top of any wallpaper rather than replacing it, they pair naturally with the Scheduler too. A rotation that moves between two or three different wallpapers across the day does not have to give up a consistent look in the process, since whatever filter you have chosen can carry across each of those scenes rather than being a setting you have to reapply every time the Scheduler switches to something new.
Photo Wallpaper mode: your own photos, not a built-in scene
Photo Wallpaper mode is the most different of the three, because it is the one feature here that steps outside the wallpaper catalog entirely. Instead of running one of Gloomia's twenty designed scenes, it turns your own photos into a gentle Ken Burns-style slideshow, and it supports two confirmed sources for pulling those photos in: Synology Photos and DLNA.
That puts Photo Wallpaper mode in the same category as Model Viewer in one important respect: both are features where the content is not something Gloomia built, it is something you bring. The Model Viewer wallpaper loads a 3D file you point it at; Photo Wallpaper mode loads photos you point it at instead. Neither one has a fixed visual identity the way Starfield or Command Center does, because the actual content is supplied by you rather than designed in advance.
What the Ken Burns effect actually is
"Ken Burns-style slideshow" is a specific enough term that it is worth being precise about where it comes from. The Ken Burns effect is a slow pan-and-zoom technique for animating still photographs, named after documentary filmmaker Ken Burns, who used gentle zooms and pans across archival photographs in his 1990 documentary series The Civil War to give static images a sense of motion and draw attention to specific details within a frame. The technique spread well beyond documentary filmmaking afterward, Apple built it directly into consumer software like iPhoto and iMovie, and it has since become the default way a huge number of slideshow and video tools animate still photos rather than just cutting between them.
Applied to a desktop wallpaper, the same idea holds: instead of a photo appearing on screen and sitting there completely static until the next one replaces it, the image slowly zooms and pans, then eases into the next photo the same way. That is a meaningfully different feeling from a plain slideshow that just swaps one still frame for the next, and it is the specific treatment Photo Wallpaper mode applies to whatever photos it is pulling from.
Where the photos actually come from: Synology Photos and DLNA
Photo Wallpaper mode needs a source to pull images from, and the two confirmed sources are Synology Photos and DLNA. They solve a similar problem in different ways, and knowing the difference matters if you are deciding whether either one fits how your own photo library is set up.
Synology Photos is the photo management app built into Synology's own NAS devices, letting people who already store their library on a Synology NAS browse, organize, and share it directly from that box. If your photos already live on one, Synology Photos is the source that reaches straight into that existing library rather than asking you to move anything.
DLNA, short for Digital Living Network Alliance, is a broader and older idea: an industry-wide standard, originally developed by Sony and Intel, for how devices on the same home network discover each other and share media, including photos, music, and video, without needing everything to come from one specific brand of hardware. A DLNA-compatible NAS, media server, or even certain routers and PCs can act as a source under that standard, which makes DLNA support meaningfully broader than a single vendor's app: it is the option that covers whatever DLNA-compatible server you already have running on your network, Synology or otherwise.
Together, that gives Photo Wallpaper mode two realistic paths into an existing photo library rather than one narrow one: a dedicated app if you are already inside the Synology ecosystem, and a much wider standard if your setup involves anything else that speaks DLNA.
How these three features fit around the rest of Gloomia
None of the Scheduler, filters, or Photo Wallpaper mode replace anything else Gloomia already does. Multi-monitor support, including a shared scene centre setting on wallpapers that have one to keep a scene's focal point aligned across multiple displays, still works the way it always has, and all three of these features sit on top of that same per-display setup rather than overriding it. If you are running Gloomia across more than one monitor and have not set that up yet, the dual-monitor setup guide covers assigning wallpapers per display in more depth.
It is also worth being honest about what is not confirmed here rather than guessing. Whether the Scheduler, filters, and Photo Wallpaper mode are limited to specific platforms the way screen saver mode and the Windows lock-screen image feature are, or whether they behave identically on Windows, macOS, and Linux the way the rest of the catalog does, is not something this post is going to assert one way or the other, since the details available do not spell that out. The macOS and Linux differences post covers the platform gaps that are actually confirmed, which is the better place to check before assuming any specific feature works identically everywhere.
Why these three are worth turning on
None of the Scheduler, filters, or Photo Wallpaper mode are the reason most people first install Gloomia. That reason is almost always a specific wallpaper someone saw a screenshot of. But once the app is installed and a wallpaper is already running, these three features are the difference between a desktop that looks the same at every hour of every day and one that actually adapts, whether that means rotating scenes on a schedule, changing the mood of a scene with a filter, or replacing the catalog entirely with a slideshow of your own photos moving the way a documentary pans across an old photograph. They are quieter than the wallpaper catalog, and they are easy to never open, but they are also not hidden once you know to look for them, and for a lot of people they end up being the setting that makes the rest of the catalog feel like it was actually set up for their desktop rather than just switched on.
Frequently asked questions
What does Gloomia's Scheduler actually do?
The Scheduler lets you pick which wallpaper shows across the day, so your desktop can rotate from one scene to another at different times instead of staying fixed on a single wallpaper around the clock.
What do Gloomia's visual filters change about a wallpaper?
Filters layer over any wallpaper in the catalog, changing the look of the scene without changing the underlying animation. They are a separate feature from the wallpapers themselves, applied on top rather than baked into a specific scene.
What is Photo Wallpaper mode, and how is it different from Gloomia's animated wallpaper catalog?
Photo Wallpaper mode turns your own photos into a gentle Ken Burns-style slideshow instead of running one of Gloomia's built-in animated scenes. It draws from photos you point it at rather than a scene Gloomia designed, and it supports Synology Photos and DLNA as photo sources.
What is the Ken Burns effect, and why does Photo Wallpaper mode use it?
The Ken Burns effect is a slow pan-and-zoom technique, named for documentarian Ken Burns, that gives still photographs a sense of motion by gradually zooming and panning across them instead of holding them static. Gloomia's Photo Wallpaper mode applies that same gentle pan-and-zoom treatment to your own photos as it moves through them.
What is DLNA, and why does it matter for Photo Wallpaper mode?
DLNA is an industry standard for sharing media, including photos, between devices over a home network, originally developed by Sony and Intel. Because Photo Wallpaper mode supports DLNA as a source, it can pull photos from any DLNA-compatible server on your network rather than only from files stored locally on the machine running Gloomia.
Do I need a Synology NAS to use Photo Wallpaper mode?
No. Synology Photos is one of two confirmed supported sources for Photo Wallpaper mode, alongside DLNA, so it is an option if you already keep your library on a Synology NAS, not a requirement. If your photos live somewhere else, DLNA covers a much broader range of home media servers and devices.
Does the multi-monitor "scene centre" setting apply to the Scheduler and filters too?
Gloomia's multi-monitor support includes a shared scene centre setting on wallpapers that have one, which keeps a scene's focal point aligned across multiple displays. Since the Scheduler and filters both work on top of whichever wallpaper is currently assigned, they inherit that same per-display setup rather than replacing it.