Eq

Video Single output Transform

Adjust brightness, contrast, gamma, and saturation.

FFmpeg filter: eq — the official reference.

Add it to a graph. The explicit form works for every filter — bind it to its input and read the result from outputs():

$node   = $video->addFilter(new Eq(…));
$result = $node->outputs()[0];

Shorthand. Single-output filters can skip the node — apply() returns the result stream directly:

$result = $video->apply(new Eq(…));

When to use it

TODO — when this filter shines: what it’s the right tool for, what to reach for instead when it isn’t, and how it composes with neighbouring filters.

How to use it

TODO — prose: how the filter actually works and what its key parameters mean (the explanation FFmpeg’s terse option help omits).

Examples

TODO — runnable PHP, with the equivalent ffmpeg CLI alongside.

Gotchas

TODO

See also

TODO

Parameters

Parameter	Type	Default	Range / values	Description
contrast	string	1.0	—	set the contrast adjustment, negative values give a negative image
brightness	string	0.0	—	set the brightness adjustment
saturation	string	1.0	—	set the saturation adjustment
gamma	string	1.0	—	set the initial gamma value
gamma_r	string	1.0	—	gamma value for red
gamma_g	string	1.0	—	gamma value for green
gamma_b	string	1.0	—	gamma value for blue
gamma_weight	string	1.0	—	set the gamma weight which reduces the effect of gamma on bright areas
eval	EqEval	init	init, frame	specify when to evaluate expressions

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Maps to FFmpeg’s eq filter. Verified against ffmpeg n7.1.1.