#3026: support vectorscope graticule in histogram color modes
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Reporter: dericed | Owner:
Type: enhancement | Status: new
Priority: normal | Component: avfilter
Version: git-master | Keywords: histogram
Blocked By: | Blocking:
Reproduced by developer: 0 | Analyzed by developer: 0
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Summary of the enhancement request:
A vectorscope graticule overlay option would allow for easier measurements
and readings when using the color and color2 modes of the histogram filter
and allow for the emulation of some broadcast equipment. An example of a
vectorscope graticule overlay for NTSC is here
http://upload.wikimedia.org/wikipedia/commons/7/7b/Vectorscope_graticule.png.
A very rough un-aligned example can be produce via:
ffmpeg -i Vectorscope_graticule.png -f lavfi -i smptebars -filter_complex
"[0:v]scale=-1:256[a];[1:v]histogram=mode=color,transpose=cclock[b];[b][a]overlay[c]"
-map "[c]"
Slightly better looking and aligned to center, but still unaligned at
color points.
ffmpeg -i Vectorscope_graticule.png -f lavfi -i smptebars -filter_complex
"[0:v]null[a];[1:v]histogram=mode=color,transpose=cclock,scale=680:680,negate[b];[b][a]overlay=24:44[c]"
-map "[c]" -f nut -c:v rawvideo - | ffplay -
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3026>
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