Get this effect
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Install the skill (once)
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Install the Recharm video effects skill: download https://recharm-growth-staging.s3.us-east-2.amazonaws.com/website/downloads/recharm-video-effects.zip and unzip it into ~/.claude/skillsAsk for the effect
Add emboss to input.mp4 How deep the relief looks: 2 Brightness of the flat surface, 0-255: 128
Several videos, several effects, one ask
Put your clips in the folder, mention them with @, and ask for everything at once. Claude runs one tested script after another on each clip, then joins them.
Add emboss to @clip1.mp4, put a sale badge on @clip2.mp4, give @clip3.mp4 a VHS look, then join all three with crossfades.
Settings you can change
Ask Claude to change any of these, or edit them at the top of the command.
| Setting | Default | What it does |
|---|---|---|
DEPTH | 2 | How deep the relief looks. 1 is subtle, 4 is deeply carved. |
GRAY | 128 | Brightness of the flat surface, 0-255. Lower it for darker metal. |
Without the skill
Don’t want to install the skill? Paste this prompt into Claude Code and Claude writes the command itself.
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Apply a gray emboss effect to all of input.mp4, from the first frame to the last. Convert it to grayscale, then run a 3x3 convolution on it with the kernel -2 -2 0 / -2 0 2 / 0 2 2 (rows top to bottom) and add 128 to the result, clipped to 0-255 (ffmpeg: format=gray,convolution=0m='-2 -2 0 -2 0 2 0 2 2':0bias=128). Flat areas become mid-gray (128) and every edge turns into a bright line on one side and a dark line on the other, so the picture looks stamped into metal. No color should remain. Keep the size (540x960), frame rate, length and audio the same. Use ffmpeg and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as emboss.sh and run:
sh emboss.sh input.mp4 output.mp4Show the command
#!/bin/sh
# Emboss: turn the picture into a gray relief, as if it were stamped into metal.
# Usage: sh emboss.sh input.mp4 output.mp4
set -e
IN="$1"; OUT="$2"
DEPTH=2 # how deep the relief looks (1 is subtle, 4 is deeply carved)
GRAY=128 # the flat surface's brightness (0-255)
# Subtract each pixel's top-left neighbors from its bottom-right ones: every edge gets a bright ridge
# on one side and a dark shadow on the other, and flat areas settle on the GRAY surface.
K="-$DEPTH -$DEPTH 0 -$DEPTH 0 $DEPTH 0 $DEPTH $DEPTH"
ffmpeg -y -i "$IN" -vf "format=gray,convolution=0m='$K':0bias=$GRAY,format=yuv420p" \
-c:v libx264 -crf 18 -pix_fmt yuv420p -c:a copy "$OUT"
