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[Bugfix] Honor the requested output canvas in BAGEL img2img (#7287)

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Signed-off-by: Ding Zuhao <e1583181@u.nus.edu>
Co-authored-by: Cursor <cursoragent@cursor.com>
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Ding ZuhaoandCursor authored and GitHub committed 2026-09-21 07:29:24 +00:00
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commit 154a1f25f5
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docs/user_guide/examples/online_serving/bagel.md
+14 -8
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@@ -247,12 +247,18 @@ curl http://localhost:8091/v1/chat/completions \
-d @payload.json
```
BAGEL img2img derives its generated image size from the input image. It
preserves the input aspect ratio, aligns dimensions to the latent stride, and
applies the checkpoint size limit; explicit `height` and `width` values do not
override this model-specific resize policy. In step mode, the effective size is
resolved before scheduler admission so requests with different resulting
shapes are not combined.
When no output size is requested (`size=auto` on `/v1/images/edits`, or no
`height`/`width` in a chat request), BAGEL img2img derives the canvas from the
input image: it preserves the input aspect ratio, aligns dimensions to the
latent stride (16 px), and applies the checkpoint size limit. An explicit
`size`, `height`, or `width` is honored instead, in both the single-stage and
the two-stage deployment; the input image is still resized to a stride-aligned
size for the VAE/ViT prefill. The latent grid needs multiples of 16, so a
requested side that is not one is floored to the next multiple (1000x700
generates 992x688) and the server logs a warning; the response reports the
generated size. A side above the checkpoint limit is rejected with HTTP 400.
In step mode, the effective size is resolved before scheduler admission so
requests with different resulting shapes are not combined.
### Image to Text (img2text)
@@ -318,8 +324,8 @@ curl http://localhost:8091/v1/chat/completions \
| `--server` / `-s` | `http://localhost:8091` | Server URL |
| `--image-url` / `-i` | `None` | Input image URL or local path (img2img/img2text) |
| `--modality` / `-m` | `text2img` | `text2img`, `img2img`, `img2text`, `text2text` |
| `--height` | `512` | Text-to-image output height; BAGEL img2img derives its size from the input image |
| `--width` | `512` | Text-to-image output width; BAGEL img2img derives its size from the input image |
| `--height` | `512` | Output height, a multiple of 16; omit both `--height` and `--width` to let img2img derive the size from the input image |
| `--width` | `512` | Output width, a multiple of 16; omit both `--height` and `--width` to let img2img derive the size from the input image |
| `--steps` | `25` | Number of inference steps |
| `--seed` | `42` | Random seed |
| `--negative` | `None` | Negative prompt for CFG |