Troubleshooting

"No subscription found on this computer"

Open the Litesum Launcher and sign in. It activates the computer once, and every Litesum application shares that activation. Litesum Enhance cannot sign you in itself. That is the Launcher's job, and keeping it there is what makes the two-computer allowance count computers rather than installations.

Everything already enhanced can still be viewed and exported. Nothing is deleted, locked or watermarked.

"The subscription needs re-checking"

Your computer has been offline longer than the licence allows. Connect to the internet and open the Litesum Launcher, which renews the licence. Then press Check again in Litesum Enhance.

Setting the clock back does not extend the offline period, and will produce this message.

Enhance is greyed out

Four possible reasons, and the status bar always says which:

1. No image is open.
2. The job is too large. The Output section shows why and names a scale that will work.
3. There is no subscription on this computer, or it needs attention. See above.
4. A batch is running. Wait for it to finish, or stop it.

It says "CPU (Classical)" instead of a graphics card

Enhancement is running on the processor, which works but is roughly twenty times slower, and if it says Classical rather than CPU (ONNX Runtime), the AI models are not loading at all and you are getting a conventional resize.

This should now fix itself: at every start the application checks its AI models, rebuilds the record from files already on your computer when it can, and downloads only what no local file can supply, and you will see the progress in the status bar. Photographs keep working either way: the classical method stands in for their 2× and 4× networks until the model is restored, clearly labelled as such in the result.

If it still reports a problem, open About and press Check models. It will tell you whether a model file is missing or damaged and offer to repair it, trying the local rebuild first, downloading only if that cannot help.

If the models are fine and it still uses the processor, your graphics driver may not support DirectX 12. Updating the graphics driver is the usual fix.

The result looks worse than the original

Look at 100 %, not Fit. At Fit everything looks good.

Then check the photo type. The most common cause is a photograph being processed as Low Resolution, which is deliberately assertive, or artwork being processed as a photograph. Turn off Automatic and pick the type yourself.

If it is a photograph of dense foliage, fur or a clear sky, you may be running into a genuine weakness rather than a setting. See what Litesum Enhance can and cannot do.

Small text came out unreadable

Expected, and unavoidable. Letters are enlarged, not read. If the strokes are below about two pixels in the source there is nothing left to reconstruct from.

The enhanced image looks slightly different in colour

Check the colour profile under Image details. If your source had an embedded profile it is preserved, and an application that ignores profiles will show it differently from one that respects them.

An image in a batch failed

Open the report in the destination folder. Each failure is listed with its reason. Common ones: the file is not a valid image, the format is not supported, or the job needed more memory than was free.

Out of memory

Litesum Enhance refuses jobs it cannot finish, so this should be rare. If it happens, close other applications and try again, or use a smaller enlargement.

Memory needed grows with the square of the enlargement: 4× needs four times what 2× does, not twice.

Sending a diagnostics report

About → Copy diagnostics. It contains the application version, your operating system, the number of processors, memory, the graphics backends and which one is in use, and the installed models with the folder they are in.

It contains no image data and no file names from your work.