Check the file actually loaded on the screen before changing settings. Confirm the intended playlist entry, then compare a reduced copy of the same image while keeping its format and other settings unchanged.
Start with the image that actually reached the screen, not the preview on your computer. Confirm that the intended file is in the loaded playlist, then try a reduced-dimension copy without changing its format or the playback settings. A smaller image appearing in the same position narrows the investigation, but it does not establish a maximum supported size.
Keep the original artwork and a copy of the current playlist before making changes. Change one variable at a time so that each result tells you something useful.
Match the symptom to the right check
Watch the playlist through a complete cycle. Record whether the missing image leaves a blank interval, appears incorrectly, or never seems to be selected.
- Other images appear, but one item is blank: Check that item's deployed file, format and pixel dimensions first.
- An older version of the artwork appears: Check the source media and reload process before editing the picture again.
- The intended item never appears in the sequence: Check whether it is included in the loaded playlist and whether you have watched its full cycle.
- A reduced copy appears where the original did not: Investigate dimensions and encoding. Do not change unrelated playback settings yet.
- Every image is missing: Broaden the investigation to the loaded show and app startup rather than treating this as a single-image fault.
If the show does not start at all, use the separate checks for offline playlist autostart. That is a different fault from one missing picture inside an otherwise visible sequence.
Check the file that reached the screen
A successful preview proves that your computer can open its copy. It does not prove that the same file reached the display or that the signage app can render that export.
The IMD Signage Player accepts JPG, PNG and WebP images. PowerPoint, PDF, HEIC and GIF do not play. Renaming an unsupported file with a supported extension does not convert it; export a new image from the application that created it.
Check the deployment path in this order:
- Open the actual image on the microSD card or USB stick, rather than the original in your artwork folder.
- Confirm its filename, extension, pixel dimensions and file size.
- Check that it contains the latest artwork. A temporary, visible revision label can distinguish two otherwise similar exports.
- Confirm that this is the source used for the display's reload.
- Use the player's PIN-protected menu to reload the card, then watch for the revised artwork.
The player is designed to play from an internal copy of the show. Editing a file on removable media alone is therefore not proof that the loaded show has changed. For this check, power the display down before inserting or removing media rather than relying on card changes during playback.
The broader digital signage player guide explains player choices. Keep this investigation focused on the particular file and playlist you are using.
Confirm that the intended image is selected
Before resizing anything, establish whether the picture is actually part of the loaded sequence. A file sitting beside the playlist is not sufficient evidence that it will appear.
Write down the expected order of the images. Watch the screen and compare that order with what appears. If several exports look alike, add a short revision label to a diagnostic copy so you can identify it without guessing.
Where your signage app provides playlist entries or image regions, inspect the entry or region that should use the picture. Confirm that it references the intended file. Do not assume that an editor preview and a deployed playlist have identical references.
For a controlled comparison, use a copy of the show containing the suspect image and one image that already displays correctly. Keep the playback settings unchanged. This separates a missing or incorrectly selected entry from an image that is selected but does not render.
Separate pixel dimensions from file size
“Smaller” can mean fewer pixels or fewer encoded bytes. Record both before drawing a conclusion.
A compressed image must be decoded for display. For a four-byte-per-pixel decoded buffer, a 6000 × 4000 image requires about 96 MB for that buffer alone. This is a general memory calculation, not a specification or limit for our displays. The stored JPG could be much smaller than its decoded representation, and additional processing may require more memory.
That is why reducing compression quality is not the same test as reducing pixel dimensions. Lower quality can reduce the stored file size while leaving the decoded pixel count unchanged.
Prepare a copy sized for its actual visible area. Check the installed screen's resolution and the space occupied by the artwork rather than assuming that print-resolution artwork is useful. Keep the aspect ratio unchanged. The guidance on preparing portrait signage images covers orientation and layout when the mounted screen is vertical.
Fix the image with a controlled export
Use this sequence to preserve the diagnostic value of each change:
- Save the original image and record its format, width, height and file size.
- Export a reduced-dimension copy in the same format where practical. Keep the artwork and aspect ratio unchanged.
- Replace only the suspect image in your diagnostic show. Leave its position and playback settings alone.
- Reload the revised show and observe the affected item on the physical screen.
- If the reduced copy remains blank, make a separate JPG or PNG export and repeat the comparison. Record that the format changed this time.
For artwork that depends on transparency, check the result against the intended background. An opaque diagnostic copy can help distinguish missing artwork from artwork that blends into its background. Treat that as a separate test, not another simultaneous change.
If the reduced copy appears, keep a screen-sized export as the delivery file and retain the larger original for future editing. Do not turn one successful comparison into a claimed player limit.
Check the final show and keep the evidence
Restore the full intended sequence and remove temporary revision labels. Reload the final files, then watch a complete cycle on the installed screen. Check that the image appears in the correct position, has the right proportions and remains readable from the normal viewing location.
If the image remains blank, keep the original and reduced exports together. Record their dimensions, formats and file sizes, the app being used, the reload method, and which comparison image appeared successfully. Send those details through the contact page so the next check starts with a reproducible result rather than another round of unrelated setting changes.
Questions
Why does an image open on my computer but not appear on the signage screen?
Your computer preview and the deployed show are separate checks. The screen may have an older copy, the intended image may not be selected, or the export may need different dimensions or encoding. Confirm the loaded file first, then compare a reduced copy without changing unrelated settings.
Is reducing JPG quality the same as resizing the image?
No. Lower export quality can reduce the stored file size without changing its pixel dimensions. Decoding still requires memory for those pixels. To isolate a dimension-related problem, reduce the width and height while keeping the format and artwork unchanged where practical.
Which image formats can I try with IMD Signage Player?
The player accepts JPG, PNG and WebP images. If you need a format comparison, export a separate JPG or PNG copy and test it after the dimension comparison. Do not simply rename the extension, and check the background if the original artwork uses transparency.
Planning information, not legal or engineering advice. Rules differ by place: check codes and permits with your local authority and your licensed trades.