If an upscale came back with detail that was never in your drawing, Creativity is why. The upscaler is a generative model: it redraws your picture at the larger size rather than enlarging the pixels you gave it. Creativity sets how much freedom it has to invent, and Resemblance sets how hard it is pulled back toward what you supplied. Sharpen and HDR change only how the result looks, never what is in it.
The four sliders
| Slider | Range | Default | What it controls |
|---|---|---|---|
| Sharpen | 0 to 10 | 3 | Edge contrast in the finished image |
| Resemblance | 0.00 to 3.00 | 0.60 | How closely the redraw is held to your original |
| HDR | 1 to 50 | 5 | How hard the model is pushed toward the prompt, and how wide the tonal range gets |
| Creativity | 0.00 to 1.00 | 0.35 | How much of the picture it is allowed to reinvent |
Those ranges are enforced by the server, so a value outside them is refused rather than quietly clipped. The current value of each slider is printed beside its name.
To keep your drawing intact
- Drag Creativity toward 0.00. At the default of 0.35 the model is redrawing roughly a third of what it sees, which is generous for a photograph and far too much for a plan.
- Raise Resemblance above the default 0.60. Higher values hold the output to the input. Low values let it drift.
- Leave the Prompt box empty, or describe what the image already is. The prompt is optional. A prompt describing something the picture is not gives the model a target to move toward, which is a second route to detail you did not ask for.
- Use Sharpen and HDR for the look. Neither one adds or removes anything from the scene, so they are safe to push.
Line work is the hard case
A photograph tolerates a redraw well, because invented texture reads as more of the same texture. A hand drawing, a plan, an elevation or a diagram does not. At default settings the model will happily rewrite lettering into something that looks like lettering, invent hatching, and adjust dimension lines. If your source is line work, start at Creativity 0.00 and Resemblance well above default, and raise Creativity only if the result looks flat.
Repeating a run exactly
Under Advanced Settings, the seed is random by default, so the same image and the same sliders give a slightly different picture every time. Set it to a fixed number and the run becomes repeatable. That is the way to test one slider at a time: fix the seed, change one value, compare.
What it costs
Upscaling costs 1 credit at 2x, 2 credits at 3x and 3 credits at 4x. The figure for the run you are about to start is printed next to Generate, along with your balance. A failed upscale does not return your credits, so if one fails, ask the UNI team rather than retrying blind.