Utilising the 'extractplanes', 'blend', and 'xfade' filters found in FFmpeg 4.2.2. In the examples shown here, the following script and arguments were run (in order):$ rgbLumaBlendCycle_FFmpeg.sh 'image1.jpg' 'screen'
$ rgbLumaBlendCycle_FFmpeg.sh 'image2.jpg' 'difference'
$ rgbLumaBlendCycle_FFmpeg.sh 'image3.jpg' 'pinlight' 'REV'
#!/usr/bin/env bash
# FFmpeg ver. 4.2.2+
# RGB affected luma cycle: Each colour plane is extracted and blended with the
# original image to adjust overall image brightness. The result of each blend
# is faded into the next, before belnding back to the original image.
# Parameters:
# $1 : Filename
# $2 : Blend type (e.g. average, screen, difference, pinlight, etc.)
# $3 : Reverse blend order (any string to enable)
# version: 2020.07.15_12.28.31
# source: https://oioiiooixiii.blogspot.com
function main()
{
local mode="$2"
local name="$1"
local layerArr=('[a][colour1]' '[b][colour2]' '[c][colour3]'
'[colour1][a]' '[colour2][b]' '[colour3][c]')
local layerIndex="${3:+3}" && layerIndex="${layerIndex:-0}"
# Array contains values for both blend orders; index is offset if $3 is set
ffmpeg \
-i "$name" \
-filter_complex "
format=rgba,loop=loop=24:size=1:start=0,
split=8 [rL][gL][bL][colour1][colour2][colour3][o][o1];
[rL]extractplanes=r,format=rgba[a];
[gL]extractplanes=g,format=rgba[b];
[bL]extractplanes=b,format=rgba[c];
${layerArr[layerIndex++]}blend=all_mode=${mode}[a];
${layerArr[layerIndex++]}blend=all_mode=${mode}[b];
${layerArr[layerIndex]}blend=all_mode=${mode}[c];
[o][a]xfade=transition=fade:duration=0.50:offset=0,format=rgba[a];
[a][b]xfade=transition=fade:duration=0.50:offset=0.51,format=rgba[b];
[b][c]xfade=transition=fade:duration=0.50:offset=1.02,format=rgba[c];
[c][o1]xfade=transition=fade:duration=0.50:offset=1.53,format=rgba
" \
${name}-${mode}.mkv
}
main "$@"
download: rgbLumaBlendCycle_FFmpeg.sh
Image Credits:
Henry Huey - "Alice in Wonderland - MAD Productions 5Sep2018 hhj_6811"
Attribution-NonCommercial 2.0 Generic (CC BY-NC 2.0)
https://www.flickr.com/photos/henry_huey/43768692515/
Henry Huey - "Alice in Wonderland - MAD Productions 5Sep2018 hhj_6869"
Attribution-NonCommercial 2.0 Generic (CC BY-NC 2.0)
https://www.flickr.com/photos/henry_huey/29740096427/
Henry Huey - "Alice in Wonderland - MAD Productions 5Sep2018 hhj_6848"
Attribution-NonCommercial 2.0 Generic (CC BY-NC 2.0)
https://www.flickr.com/photos/henry_huey/29740096117/
