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fix: add alpha channel input for Qwen Image 2.1 and relative docs (#2021)

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Weiqi Gao authored and GitHub committed 2026-09-22 21:45:06 +08:00
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docs/qwen_image_2.1.md
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@@ -39,3 +39,21 @@ Pass the reference image with `-r` and describe the edit in `-p`. Vision weights
```
For multiple reference images, repeat `-r` in the desired order, for example `-r first.png -r second.png`.
### Alpha channel
This model supports alpha channel output. As the model determines whether to output a regular image or with transparency through the prompt, according to [official recommendation](https://github.com/QwenLM/Qwen-Image-2.1#transparent-image-generation-rgba), use the following prompt format for better results:
> `This is an RGBA image with transparency. <your description>. The image has alpha channel and the background is transparent.`
Since transparency is decided by the prompt rather than by the input or an explicit switch, the same format applies equally to editing, whether or not the reference image itself has an alpha channel. Note that alpha is kept only in `.png` and `.webp` outputs; saving as `.jpg` drops the transparency.
Here are some examples ran with Q6_K quantization:
| Input | Prompt | Output |
| --- | --- | --- |
| ![Qwen Image 2.1 alpha input example 1](../assets/qwen/qwen-image-2.1-alpha-in1.png) | This is an RGBA image with transparency. Replace the text "BLOOM" with "Qwen Image 2.1", keeping the same font of the original text. The image has alpha channel and the background is transparent. | ![Qwen Image 2.1 alpha output example 1](../assets/qwen/qwen-image-2.1-alpha-out1.png) |
| ![Qwen Image 2.1 alpha input example 2](../assets/logo.png) | This is an RGBA image with transparency. Remove the background of the image, keeping only the text and cat. The image has alpha channel and the background is transparent. | ![Qwen Image 2.1 alpha output example 2](../assets/qwen/qwen-image-2.1-alpha-out2.png) |
### Other features
Other features of the model could be found on the [model card from QwenLM/Qwen-Image-2.1 repo](https://github.com/QwenLM/Qwen-Image-2.1), including 2 finetuned prompt rewriting Qwen3.5-9B model.