Remove a watermark from every frame of a video. SAM3 finds it from a text prompt, Mask Refine grows and softens the mask, LaMa fills it, and Save Video rebuilds the clip at the source frame rate with the original audio.<h3 id="requirements-(read-this-first)">Requirements (read this first)</h3><ul><li>ComfyUI, updated (I tested on 0.37.0).</li><li>AusBoss nodes 2.2.0 or newer: ComfyUI-Manager → search "AusBoss" (registry id <code>ausboss-nodes</code>). Manager installs it.</li><li>ComfyUI-RMBG, for the SAM3 Segment node: ComfyUI-Manager → search "RMBG" (registry id <code>comfyui-rmbg</code>). On its first run it downloads <code>sam3.pt</code> (3.45 GB) into <code>ComfyUI/models/sam3/</code> by itself.</li><li>big-lama.pt (206 MB): download it <a target="_blank" rel="ugc" href="https://github.com/Sanster/models/releases/download/add_big_lama/big-lama.pt">here</a> and put it in <code>ComfyUI/models/lama/</code> yourself; the LaMa node never downloads models.</li><li>Nothing else. rgthree and Easy-Use are no longer needed.</li></ul>Restart ComfyUI after installing the two packs.Manager can't find AusBoss? In the classic Manager window, if the Channel box is empty, pick default, then click Install Missing Custom Nodes again. <a target="_blank" rel="ugc" href="https://github.com/ausboss/ComfyUI-AusBoss#if-manager-cant-find-ausboss">See what to click</a>.<h3 id="what-changed-since-v1.1">What changed since v1.1</h3><ul><li>Two packs instead of four. v1.1 also needed rgthree (group switch, labels) and Easy-Use (the frame counter). Those nodes are gone; both branches are plain groups and a Workflow Note card explains the run.</li><li>"Install Missing Custom Nodes" works now. v1.1 tagged SAM3 Segment and the frame counter with the wrong node-pack id, so ComfyUI-Manager looked for them in the wrong pack. SAM3 Segment now names ComfyUI-RMBG. The AusBoss nodes are also on the Comfy Registry now; they weren't when v1.1 went up.</li><li>Runs as downloaded. v1.1 shipped with the full-video branch bypassed; now both branches run, and SAM3 unloads its model after each branch to leave room for LaMa.</li><li>A sample clip with a visible watermark, so your first run shows the mask and the clean result.</li><li>Saves straight into the output folder instead of an <code>AusBoss/</code> subfolder.</li><li>Files that use the v1.0 <code>SimpleWatermarkRemover</code> node still open: AusBoss nodes keep that node id as a compatibility node.</li></ul><h3 id="what's-inside">What's inside</h3><ul><li>Load Video: the sample clip or your own; trim with the IN/OUT handles.</li><li>Detect: SAM3 Segment with the prompt "watermark" (confidence 0.29) builds a mask on every frame.</li><li>Refine: Mask Refine grows the mask by 8 px and softens it, so the fill covers the edges too.</li><li>Remove: LaMa Inpaint fills the mask frame by frame and leaves every unmasked pixel alone.</li><li>Save: Save Video writes the cleaned MP4 at the source fps, with the source audio.</li><li>Single-frame check: a second branch runs the same steps on one frame and shows the mask and a before/after slider, so you can check detection before a long run.</li></ul><h3 id="quick-start">Quick start</h3><ol><li>Install the requirements above and restart ComfyUI.</li><li>Unzip <code>sample_inputs.zip</code> into <code>ComfyUI/input/</code> (it holds <code>ausboss_night_moscow_watermarked.mp4</code>). The sample clip carries an AusBoss watermark in the lower-right corner.</li><li>Drag the workflow in and queue. The top branch writes the cleaned video; the bottom one shows the single-frame check.</li><li>For your own clip, check a single frame first: select the full-video group and mute it (Ctrl+M) to work on the still only. If the watermark has a more specific description, put that in the detection prompt. Then unmute and run the whole clip.</li></ol><h3 id="models">Models</h3><ul><li><a target="_blank" rel="ugc" href="https://github.com/Sanster/models/releases/download/add_big_lama/big-lama.pt">big-lama.pt</a> → <code>models/lama</code> · 206 MB</li><li><a target="_blank" rel="ugc" href="https://huggingface.co/1038lab/sam3/resolve/main/sam3.pt">sam3.pt</a> (downloaded by ComfyUI-RMBG on first run) → <code>models/sam3</code> · 3.45 GB</li></ul><h3 id="settings-that-worked-and-what-didn't">Settings that worked, and what didn't</h3><ul><li>Detection: "watermark" at confidence 0.29 is the starting point. If SAM3 misses part of the mark or grabs other text, change the prompt or the confidence threshold.</li><li>Edges: if an outline stays visible, raise Expand on Mask Refine a little and add a bit more blur.</li><li>Limits: LaMa fills each frame on its own, so busy or moving backgrounds under the mark can flicker, and it can leave some distortion behind. Review the output before you run a long clip.</li></ul><h3 id="speed">Speed</h3>Measured on an RTX 5090 (32 GB): the 124-frame 768 × 1376 sample at 24 fps was cleaned in 42 s. The first run also downloads SAM3 (3.45 GB).<h3 id="about-the-gallery">About the gallery</h3>The first clip is a straight output of this workflow, audio included; the second is the untouched sample with its watermark, for comparison. The sample (a snowy Moscow street at night) carries an AusBoss watermark in the lower-right corner. The cover is a silent before/after of the sample and the result, side by side, plus a still of it.<h3 id="license-and-credits">License &amp; credits</h3>SAM 3 is by Meta, under the SAM License; ComfyUI-RMBG fetches the weights from 1038lab's Hugging Face mirror, which follows Meta's terms. ComfyUI-RMBG is by 1038lab (GPL-3.0). LaMa is by the authors of <a target="_blank" rel="ugc" href="https://github.com/advimman/lama">advimman/lama</a> (Apache 2.0); the big-lama.pt export is hosted in Sanster's model releases. The workflow and the AusBoss nodes are free.<h3 id="changelog">Changelog</h3><ul><li>v2.0 (2026-09-25): two packs instead of four (AusBoss nodes + ComfyUI-RMBG), fixed node-pack ids for Manager's missing-node install, both branches on by default, sample clip and Workflow Note card.</li><li>v1.1 (2026-03-18): SAM3 + LaMa with a single-frame test mode.</li></ul>Questions or bugs: <a target="_blank" rel="ugc" href="https://github.com/ausboss/ComfyUI-AusBoss/issues">GitHub issues</a> or the comments here. Post what you make with it; I read everything. I post new workflows on <a target="_blank" rel="ugc" href="https://x.com/Zanzibased">X @Zanzibased</a> and <a target="_blank" rel="ugc" href="https://github.com/ausboss">GitHub</a>.

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