Ovis-Image is a 7B text-to-image model specifically optimized for high-quality text rendering, designed to operate efficiently under stringent computational constraints.
Ovis-Image Technical Report from Alibaba Group, by Guo-Hua Wang, Liangfu Cao, Tianyu Cui, Minghao Fu, Xiaohao Chen, Pengxin Zhan, Jianshan Zhao, Lan Li, Bowen Fu, Jiaqi Liu, Qing-Guo Chen.
The abstract from the paper is:
We introduce Ovis-Image, a 7B text-to-image model specifically optimized for high-quality text rendering, designed to operate efficiently under stringent computational constraints. Built upon our previous Ovis-U1 framework, Ovis-Image integrates a diffusion-based visual decoder with the stronger Ovis 2.5 multimodal backbone, leveraging a text-centric training pipeline that combines large-scale pre-training with carefully tailored post-training refinements. Despite its compact architecture, Ovis-Image achieves text rendering performance on par with significantly larger open models such as Qwen-Image and approaches closed-source systems like Seedream and GPT4o. Crucially, the model remains deployable on a single high-end GPU with moderate memory, narrowing the gap between frontier-level text rendering and practical deployment. Our results indicate that combining a strong multimodal backbone with a carefully designed, text-focused training recipe is sufficient to achieve reliable bilingual text rendering without resorting to oversized or proprietary models.
Highlights:
This pipeline was contributed by Ovis-Image Team. The original codebase can be found here.
Available models:
| Model | Recommended dtype |
|---|---|
AIDC-AI/Ovis-Image-7B | torch.bfloat16 |
Refer to this collection for more information.
( scheduler: FlowMatchEulerDiscreteScheduler vae: AutoencoderKL text_encoder: Qwen3Model tokenizer: Qwen2TokenizerFast transformer: OvisImageTransformer2DModel )
Parameters
transformer to denoise the encoded image latents. Qwen3Model) —
Text encoder of class
Qwen3Model. Qwen2TokenizerFast) —
Tokenizer of class
Qwen2TokenizerFast. The Ovis-Image pipeline for text-to-image generation.
Reference: https://github.com/AIDC-AI/Ovis-Image
( prompt: typing.Union[str, typing.List[str]] = None negative_prompt: typing.Union[str, typing.List[str]] = '' guidance_scale: float = 5.0 height: typing.Optional[int] = None width: typing.Optional[int] = None num_inference_steps: int = 50 sigmas: typing.Optional[typing.List[float]] = None num_images_per_prompt: typing.Optional[int] = 1 generator: typing.Union[torch._C.Generator, typing.List[torch._C.Generator], NoneType] = None latents: typing.Optional[torch.FloatTensor] = None prompt_embeds: typing.Optional[torch.FloatTensor] = None negative_prompt_embeds: typing.Optional[torch.FloatTensor] = None output_type: typing.Optional[str] = 'pil' return_dict: bool = True joint_attention_kwargs: typing.Optional[typing.Dict[str, typing.Any]] = None callback_on_step_end: typing.Optional[typing.Callable[[int, int, typing.Dict], NoneType]] = None callback_on_step_end_tensor_inputs: typing.List[str] = ['latents'] max_sequence_length: int = 256 ) → OvisImagePipelineOutput or tuple
Parameters
str or List[str], optional) —
The prompt or prompts to guide the image generation. If not defined, one has to pass prompt_embeds.
instead. str or List[str], optional) —
The prompt or prompts not to guide the image generation. If not defined, one has to pass
negative_prompt_embeds instead. Ignored when not using guidance (i.e., ignored if guidance_scale is
not greater than 1). float, optional, defaults to 1.0) —
True classifier-free guidance (guidance scale) is enabled when guidance_scale > 1 and
negative_prompt is provided. int, optional, defaults to self.unet.config.sample_size * self.vae_scale_factor) —
The height in pixels of the generated image. This is set to 1024 by default for the best results. int, optional, defaults to self.unet.config.sample_size * self.vae_scale_factor) —
The width in pixels of the generated image. This is set to 1024 by default for the best results. int, optional, defaults to 50) —
The number of denoising steps. More denoising steps usually lead to a higher quality image at the
expense of slower inference. List[float], optional) —
Custom sigmas to use for the denoising process with schedulers which support a sigmas argument in
their set_timesteps method. If not defined, the default behavior when num_inference_steps is passed
will be used. int, optional, defaults to 1) —
The number of images to generate per prompt. torch.Generator or List[torch.Generator], optional) —
One or a list of torch generator(s)
to make generation deterministic. torch.FloatTensor, optional) —
Pre-generated noisy latents, sampled from a Gaussian distribution, to be used as inputs for image
generation. Can be used to tweak the same generation with different prompts. If not provided, a latents
tensor will be generated by sampling using the supplied random generator. torch.FloatTensor, optional) —
Pre-generated text embeddings. Can be used to easily tweak text inputs, e.g. prompt weighting. If not
provided, text embeddings will be generated from prompt input argument. torch.FloatTensor, optional) —
Pre-generated negative text embeddings. Can be used to easily tweak text inputs, e.g. prompt
weighting. If not provided, negative_prompt_embeds will be generated from negative_prompt input
argument. str, optional, defaults to "pil") —
The output format of the generate image. Choose between
PIL: PIL.Image.Image or np.array. bool, optional, defaults to True) —
Whether or not to return a ~pipelines.flux.FluxPipelineOutput instead of a plain tuple. dict, optional) —
A kwargs dictionary that if specified is passed along to the AttentionProcessor as defined under
self.processor in
diffusers.models.attention_processor. Callable, optional) —
A function that calls at the end of each denoising steps during the inference. The function is called
with the following arguments: callback_on_step_end(self: DiffusionPipeline, step: int, timestep: int, callback_kwargs: Dict). callback_kwargs will include a list of all tensors as specified by
callback_on_step_end_tensor_inputs. List, optional) —
The list of tensor inputs for the callback_on_step_end function. The tensors specified in the list
will be passed as callback_kwargs argument. You will only be able to include variables listed in the
._callback_tensor_inputs attribute of your pipeline class. int defaults to 512) — Maximum sequence length to use with the prompt. Returns
OvisImagePipelineOutput or tuple
OvisImagePipelineOutput if return_dict is True, otherwise a tuple. When
returning a tuple, the first element is a list with the generated images.
Function invoked when calling the pipeline for generation.
Examples:
>>> import torch
>>> from diffusers import OvisImagePipeline
>>> pipe = OvisImagePipeline.from_pretrained("AIDC-AI/Ovis-Image-7B", torch_dtype=torch.bfloat16)
>>> pipe.to("cuda")
>>> prompt = 'A creative 3D artistic render where the text "OVIS-IMAGE" is written in a bold, expressive handwritten brush style using thick, wet oil paint. The paint is a mix of vibrant rainbow colors (red, blue, yellow) swirling together like toothpaste or impasto art. You can see the ridges of the brush bristles and the glossy, wet texture of the paint. The background is a clean artist's canvas. Dynamic lighting creates soft shadows behind the floating paint strokes. Colorful, expressive, tactile texture, 4k detail.'
>>> image = pipe(prompt, negative_prompt="", num_inference_steps=50, guidance_scale=5.0).images[0]
>>> image.save("ovis_image.png")( prompt: typing.Union[str, typing.List[str]] device: typing.Optional[torch.device] = None num_images_per_prompt: int = 1 prompt_embeds: typing.Optional[torch.FloatTensor] = None )
Parameters
str, optional) —
prompt to be encoded torch.device):
torch device int) —
number of images that should be generated per prompt torch.FloatTensor, optional) —
Pre-generated text embeddings. Can be used to easily tweak text inputs, e.g. prompt weighting. If not
provided, text embeddings will be generated from prompt input argument. ( images: typing.Union[typing.List[PIL.Image.Image], numpy.ndarray] )
Output class for Ovis-Image pipelines.