Rim light — which tag actually makes it
Does typing rim light actually put light on the outline?
Rim light traces a bright line along the silhouette to lift a subject off the background. There is a tag with exactly that name, so it should be enough — it was not.
Our own lighting guide taught rim light as technique number one. Its recipe also contained backlighting, so the pictures came out — but the credit went to the wrong token. A reader who lifted just the headline tag saw nothing happen.
Every cut below shares one seed, one base prompt and one sampler setting, and differs only by the tag marked in amber.
What each cut shows
rim light- No contour light. An ordinary front-lit portrait, even against a dark background.
edge lighting- Also no rim. Notably this tag scored high when measured — it changes the image, just not in the way its name promises.
backlighting, from behind- Light rides the shoulder and hair line. This is the effect you were looking for, with the subject turning away so the silhouette carries.
hard lighting- No rim, and the contrast is about the same as the other front-lit cuts; the crisp shadows of a hard light did not appear.
How these were made
Shared prompt
masterpiece, best quality, amazing quality, very awa, 1girl, solo, mature female, adult woman, short black hair, brown eyes, white blouse, upper body, dark studio, black background, <tag slot>
Tap a tag to carry it over to the builder
Negative prompt
school uniform, pleated skirt, blazer, serafuku, child, loli, teenage, bad quality, worst quality, worst detail, sketch, censor, jpeg artifacts, watermark, signature, text, extra limbs, bad hands, bad anatomy
Model
rinFlanimeIllustrious_v30 · euler_ancestral/normal · steps 28 · CFG 5 · 896×1152 · seed 777002
Takeaway
A tag with the right name does not always do the job. On this checkpoint, ask for backlighting with from behind.
How far this result reaches
Generators that read plain English, like NovelAI or Midjourney, understand rim light directly. This is a vocabulary problem in one booru-trained checkpoint.
Measured on a single Stable Diffusion family checkpoint. The same tags can behave differently on NovelAI, Midjourney or another checkpoint. This is a reference point, not a verdict.