Get this effect
Switch to Code in your Claude Desktop App
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 a cool tone filter to input.mp4 Second the cool tone starts: 1.0 Seconds the shift from the original colors takes: 0.5
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 a cool tone filter 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 |
|---|---|---|
START | 1.0 | Second the cool tone starts. 0 cools the clip from the first frame. |
FADE | 0.5 | Seconds the shift from the original colors takes. |
COOL | 0.15 | How cold the tone is: red taken out and blue added at every brightness level. 0.3 looks icy. |
Without the skill
Don’t want to install the skill? Paste this prompt into Claude Code and Claude writes the command itself.
Show the prompt
Give input.mp4 a cool blue-cyan tone. Leave the first 1.0 second untouched, then over 1.0 to 1.5 seconds blend smoothly into the cool grade and keep it to the end. The cool grade: ffmpeg colorbalance with red -0.15 and blue +0.15 in the shadows, mid-tones and highlights (rs=-0.15:bs=0.15:rm=-0.15:bm=0.15:rh=-0.15:bh=0.15) and preserve lightness on (pl=1), so the frame keeps its brightness (within about 5% of the original) while blue becomes clearly the strongest channel and red the weakest (around RGB 160, 190, 228 on average for a bright frame). Add no text (any text you do add should be drawn with Pillow, not ffmpeg's drawtext). Keep the size, the 30fps frame rate, the 6 second length and the audio. Use ffmpeg and save it as output.mp4.Run it without Claude
This is the exact command we tested. Save it as cool-tone-filter.sh and run:
sh cool-tone-filter.sh input.mp4 output.mp4Show the command
#!/bin/sh
# Cool tone filter: from 1s the whole picture slides toward icy blue-cyan over half a second, at the same brightness.
# Usage: sh cool-tone-filter.sh input.mp4 output.mp4
set -e
IN="$1"; OUT="$2"
START=1.0 # second the cool tone starts; 0 cools the clip from the first frame
FADE=0.5 # seconds the shift from the original colors takes
COOL=0.15 # how cold: red taken out and blue added in shadows, mid-tones and highlights (0.3 is icy)
# The cool grade: less red, more blue at every brightness level, luminance preserved so nothing gets darker
GRADE="colorbalance=rs=-$COOL:bs=$COOL:rm=-$COOL:bm=$COOL:rh=-$COOL:bh=$COOL:pl=1"
# Blend from the untouched shot to the graded one as the clock passes START
ffmpeg -y -i "$IN" -filter_complex "\
[0:v]format=gbrp,split[orig][c];\
[c]$GRADE[cool];\
[orig][cool]blend=all_expr='A+(B-A)*clip((T-$START)/$FADE,0,1)',fps=30,format=yuv420p[v]" \
-map "[v]" -map 0:a -c:v libx264 -crf 18 -pix_fmt yuv420p -c:a copy "$OUT"
