# Redact personal info from phone screenshots with ComfyUI and Qwen Image Edit on DGX Spark > A DGX Spark recipe by Greg Alton: run ComfyUI and Qwen-Image-Edit locally to scrub names, phone numbers, and emails from phone screenshots, on your own machine. Level: Intermediate Tool: DGX Spark Category: Images Time: About 60 minutes Checked: 2026-10-15 Tools: [NVIDIA DGX Spark ComfyUI playbook](https://build.nvidia.com/spark/comfyui), [ComfyUI Qwen-Image-Edit-2511 tutorial](https://docs.comfy.org/tutorials/image/qwen/qwen-image-edit-2511), [Qwen-Image-Edit-2511 on Hugging Face](https://huggingface.co/Qwen/Qwen-Image-Edit-2511) HTML page: https://easyaihowtos.com/guides/redact-phone-screenshots-comfyui-qwen-image-edit-dgx-spark I'll be honest: I didn't buy my DGX Spark to save money. **I bought it to learn by doing.** I bought it last year, when it cost about $4,000. That was roughly six months earlier than I'd planned. Memory prices were starting to bite, and I'd heard the price was about to rise to $4,700. This week the same machine is going for about $7,000, and no, I'm not ready to sell. I never expected it to save me money on AI subscriptions. If anything, I expected to spend *more*. What I wanted was to stop reading about AI engineering and start doing it, on hardware I control, where I could break things and learn from them. The full story is too big for one sitting, so here's the first thing I did. I'd always wanted a simple tool that takes screenshots from my phone and scrubs the personal info: names, phone numbers, emails. One of my first proofs of concept on the Spark used **ComfyUI** and **Qwen Image Edit**. It worked perfectly on the first try, and it kept working as I iterated. I was blown away. My original proof of concept used an earlier Qwen Image Edit release; this recipe uses the newest one, Qwen-Image-Edit-2511. Here's the recipe, so you can do it too. *— [Greg Alton](https://www.linkedin.com/in/greg-alton-ios)* **More DGX Spark recipes are coming.** Follow the [DGX Spark section](/dgx-spark) for the next one. ## What you need - An NVIDIA DGX Spark running DGX OS, on your network - About 70 GB of free disk for ComfyUI plus the Qwen-Image-Edit model files - A browser on the same network (to open ComfyUI on port 8188) - A few phone screenshots to clean up (start with ones you don't mind re-taking) ## Steps ### 1. Install ComfyUI with NVIDIA's DGX Spark playbook DGX Spark is an Arm64 (aarch64) machine with a Grace Blackwell chip and 128 GB of unified memory, so generic x86 install guides can trip you up. NVIDIA's official ComfyUI playbook handles it. The **Image Gen Quick Start** path makes a Python virtual environment (an isolated folder of packages), installs CUDA-enabled PyTorch for the Spark, clones ComfyUI, and installs its requirements. Open the playbook and follow its current steps, or run its automated setup script from a folder in your home directory: ```bash curl -fsSL "https://raw.githubusercontent.com/NVIDIA/dgx-spark-playbooks/refs/heads/main/nvidia/playbook-comfyui/assets/setup.sh" | bash ``` The script also downloads a starter image model (about 20 GB) you can use to confirm everything works. Prefer containers? The playbook's **Video Gen Workflow** tab has a Docker build on NVIDIA's PyTorch image instead. ### 2. Launch it and open the UI From the same folder, start the server with the playbook's launch script (or `python main.py --listen 0.0.0.0` inside the `ComfyUI` folder with the venv active). Check it's up: ```bash curl -I http://localhost:8188 ``` You should see `HTTP/1.1 200 OK`. Then open `http://:8188` from your laptop's browser. `--listen 0.0.0.0` makes ComfyUI reachable from your whole network, so only do this on a network you trust. ### 3. Make sure ComfyUI is recent enough Qwen-Image-Edit-2511 needs a recent ComfyUI with its native Qwen nodes. If the **Templates** menu has no Qwen Image Edit 2511 entry, or nodes show up red when you load the workflow, update ComfyUI (in the `ComfyUI` folder: `git pull`, then `pip install -r requirements.txt` with the venv active) and restart. ### 4. Download the Qwen-Image-Edit model files This recipe uses **Qwen-Image-Edit-2511**, the current Qwen image-editing release, repackaged for ComfyUI by the ComfyUI team. Put each file in the matching folder under `ComfyUI/models/`: ```text ComfyUI/models/ ├── diffusion_models/ qwen_image_edit_2511_bf16.safetensors ├── text_encoders/ qwen_2.5_vl_7b_fp8_scaled.safetensors ├── vae/ qwen_image_vae.safetensors └── loras/ Qwen-Image-Edit-2511-Lightning-4steps-V1.0-bf16.safetensors (optional, faster) ``` Download links for each file are in the ComfyUI tutorial linked above. The bf16 diffusion model is large (it's a 20-billion-parameter model), and the Spark's 128 GB of unified memory is what lets you run it at full precision instead of a smaller cut-down version. ### 5. Load the image-edit workflow In ComfyUI, open **Templates**, find **Qwen Image Edit 2511**, and load it (or drag in the workflow from the ComfyUI tutorial). The graph looks roughly like this: ```text Load Image (screenshot) ─┐ ├─▶ Text Encode (Qwen edit, your prompt) ─┐ Load CLIP (Qwen 2.5 VL) ─┘ │ Load Diffusion Model (2511) ─▶ (optional) Lightning LoRA ─▶ KSampler ─▶ VAE Decode ─▶ Save Image Load VAE ─────────────────────────────────────────────────────────────┘ ``` Check that each loader node points to the file you downloaded. If you use the Lightning LoRA, keep the template's low step count; without it, use the template's normal steps. ### 6. Write the redaction prompt Qwen-Image-Edit follows plain-language instructions and is unusually good with text in images, which is exactly what screenshots are. Be specific about what to change and what to keep. Prompt: ``` Redact all personal information in this phone screenshot. Cover every person's name, phone number, email address, street address, and profile photo with solid black rectangles. Keep everything else exactly the same: layout, app interface, icons, timestamps, message bubbles, and all other text. Do not add anything new. ``` ### 7. Try a fake-placeholder version Black bars are the safest. For tutorials or demos where you want the screenshot to still look natural, ask for realistic placeholders instead, and use obviously fake values: ```text Replace every person's name with "Alex Sample", every phone number with "(555) 010-0000", and every email with "user@example.com". Match the original font, size, and color. Keep the layout and all other text identical. ``` ### 8. Run, inspect, iterate Click **Run** (or Queue). Compare the output with the original side by side. If something slipped through, name it in the prompt ("also cover the contact name in the top bar") and run again. Fix the seed in the sampler when you like a result so later tweaks stay comparable. ### 9. Batch a folder of screenshots Once one prompt works, reuse it. The simplest way: put screenshots in `ComfyUI/input/`, switch the Load Image node to each file, and queue several runs. For hands-off batches, save the workflow in **API format** and post it to ComfyUI's `/prompt` endpoint from a short script, changing the image filename each time. Results land in `ComfyUI/output/`. ## Tips - Always check the output by eye before you share it. Image models can miss small text, partly hidden numbers, or names inside notifications. - Black boxes are safer than blur. Light blur on text can sometimes be reversed, and placeholders can look like real data if you aren't careful. - Keep originals local and delete them when you're done. Running on your own DGX Spark means the screenshots never leave your machine, which is the whole point. - Edited images can change pixels you didn't ask about. For anything legal or official, use a dedicated redaction tool and keep a record of what you removed. ## FAQ ### Why not just use a cloud AI app? You could, but you'd be uploading the very personal data you're trying to hide. Running locally keeps it on your own hardware. ### I heard about 'qwen-image-edit-3702'. Is that a different model? We couldn't find a release by that name. The Qwen-Image-Edit releases are named by date (2509, 2511, and so on). This recipe uses 2511, the newest Qwen-Image-Edit release on Qwen's Hugging Face page at the time of writing; if a newer one appears in the ComfyUI templates, it should drop into the same workflow. ### Does this work without a DGX Spark? Yes, ComfyUI runs on many NVIDIA GPUs. Smaller cards need the fp8 or int8 versions of the model, which use less memory. The Spark's unified memory just makes the full-size model comfortable. --- This guide is from Easy AI How-To (https://easyaihowtos.com). It is independent of the tools named above. Screens and free-plan limits change, so check the date before you rely on a button name.