ComfyUI Extension: img2txt-comfyui-nodes

Auto-generate caption (BLIP):

Using to automate img2img process (BLIP and Llava)

Requirements/Dependencies

For Llava

bitsandbytes>=0.43.0
accelerate>=0.3.0

For MiniCPM

transformers<=4.41.2
timm>=1.0.7
sentencepiece

Installation

• cd into ComfyUI/custom_nodes directory
• git clone this repo
• cd img2txt-comfyui-nodes
• pip install -r requirements.txt
• Models will be automatically downloaded per-use. If you never toggle a model on in the UI, it will never be downloaded.
• To ask a list of specific questions about the image, use the Llava or MiniPCM models. The questions are separated by line in the multiline text input box.

Support for Chinese

• The MiniCPM model works with Chinese text input without any additional configuration. The output will also be in Chinese.
  • "MiniCPM-V 2.0 supports strong bilingual multimodal capabilities in both English and Chinese. This is enabled by generalizing multimodal capabilities across languages, a technique from VisCPM"
• Please support the creators of MiniCPM here

Tips

• The multi-line input can be used to ask any type of questions. You can even ask very specific or complex questions about images.
• To get best results for a prompt that will be fed back into a txt2img or img2img prompt, usually it's best to only ask one or two questions, asking for a general description of the image and the most salient features and styles.

Model Locations/Paths

• Models are downloaded automatically using the Huggingface cache system and the transformers from_pretrained method so no manual installation of models is necessary.
• If you really want to manually download the models, please refer to Huggingface's documentation concerning the cache system. Here is the relevant except:

  • Pretrained models are downloaded and locally cached at ~/.cache/huggingface/hub. This is the default directory given by the shell environment variable TRANSFORMERS_CACHE. On Windows, the default directory is given by C:\Users\username\.cache\huggingface\hub. You can change the shell environment variables shown below - in order of priority - to specify a different cache directory:

    • Shell environment variable (default): HUGGINGFACE_HUB_CACHE or TRANSFORMERS_CACHE.
    • Shell environment variable: HF_HOME.
    • Shell environment variable: XDG_CACHE_HOME + /huggingface.

Models

• MiniCPM (Chinese & English)
  • Title: MiniCPM-V-2 - Strong multimodal large language model for efficient end-side deployment
  • Datasets: HuggingFaceM4VQAv2, RLHF-V-Dataset, LLaVA-Instruct-150K
  • Size: ~ 6.8GB
• Salesforce - blip-image-captioning-base
  • Title: BLIP: Bootstrapping Language-Image Pre-training for Unified Vision-Language Understanding and Generation
  • Size: ~ 2GB
  • Dataset: COCO (The MS COCO dataset is a large-scale object detection, image segmentation, and captioning dataset published by Microsoft)
• llava - llava-1.5-7b-hf
  • Title: LLava: Large Language Models for Vision and Language Tasks
  • Size: ~ 15GB
  • Dataset: 558K filtered image-text pairs from LAION/CC/SBU, captioned by BLIP, 158K GPT-generated multimodal instruction-following data, 450K academic-task-oriented VQA data mixture, 40K ShareGPT data.

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Prompts

This is the guide for the format of an "ideal" txt2img prompt (using BLIP). Use as the basis for the questions to ask the img2txt models.

• Subject - you can specify region, write the most about the subject
• Medium - material used to make artwork. Some examples are illustration, oil painting, 3D rendering, and photography. Medium has a strong effect because one keyword alone can dramatically change the style.
• Style - artistic style of the image. Examples include impressionist, surrealist, pop art, etc.
• Artists - Artist names are strong modifiers. They allow you to dial in the exact style using a particular artist as a reference. It is also common to use multiple artist names to blend their styles. Now let’s add Stanley Artgerm Lau, a superhero comic artist, and Alphonse Mucha, a portrait painter in the 19th century.
• Website - Niche graphic websites such as Artstation and Deviant Art aggregate many images of distinct genres. Using them in a prompt is a sure way to steer the image toward these styles.
• Resolution - Resolution represents how sharp and detailed the image is. Let’s add keywords highly detailed and sharp focus
• Enviornment
• Additional Details and objects - Additional details are sweeteners added to modify an image. We will add sci-fi, stunningly beautiful and dystopian to add some vibe to the image.
• Composition - camera type, detail, cinematography, blur, depth-of-field
• Color/Warmth - You can control the overall color of the image by adding color keywords. The colors you specified may appear as a tone or in objects.
• Lighting - Any photographer would tell you lighting is a key factor in creating successful images. Lighting keywords can have a huge effect on how the image looks. Let’s add cinematic lighting and dark to the prompt.