eq (4) - gamma¶
Watch on youtube.comgamma=0.1 … 10.0¶
The value must be a float value in range 0.1 to 10.0. The default value is “1”.
eq=gamma=0.1
00:00:00#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=0.1" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=0.5
00:00:08#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=0.5" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=1.0
00:00:15#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=1.0" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=5.0
00:00:23#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=5.0" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=10.0
00:00:31#! /bin/sh
ifn="Pexels_flowers_fast.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=10.0" \
-an "${pref}_${ifnb}.mp4"
Using expression¶
In these examples, since “${ifn}” is a video of 30 seconds, it instructs to change by approximately 1 / 3 per second.
gamma_weight can be used to reduce the effect of a high gamma value on bright image areas, e.g. keep them from getting overamplified and just plain white. The value must be a float in range 0.0 to 1.0. A value of 0.0 turns the gamma correction all the way down while 1.0 leaves it at its full strength. Default is “1”.
eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=1.0
00:00:38#! /bin/sh
ifn="Pexels_flowers.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=1.0" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=0.5
00:01:08#! /bin/sh
ifn="Pexels_flowers.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=0.5" \
-an "${pref}_${ifnb}.mp4"
eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=0.0
00:01:38#! /bin/sh
ifn="Pexels_flowers.mp4"
ifnb="`basename \"${ifn}\" .mp4`"
pref="`basename $0 .sh`"
ffmpeg -y -i "${ifn}" \
-vf "eq=gamma=(0.1+t/30.4*10.0):eval=frame:gamma_weight=0.0" \
-an "${pref}_${ifnb}.mp4"