white balance shader

the shader make the white balance effect that look samiler to the unity effect
where the effect is wraping between 2 gradient colors (warm, cool)
warm is 1
cool is -1

you can add the shader to ColorRect node and it will work fine for any thing under it
I just edit the GDQuest Gradient Map Shader video so i can use it in any scene
without adding it for every single sprite and in the same time it wrabs between 2 colors

you need to add the gradient colors by your self and put it in the shader param
(you can learn how to make the colors from this video )
then change the mix_amount value to 1 for warm or -1 for cool

Shader code

shader_type canvas_item;

uniform sampler2D warm_color: hint_black;
uniform sampler2D cool_color: hint_black;
uniform float temperature = 0;

void fragment(){
	
	vec4 input_color = textureLod(SCREEN_TEXTURE, SCREEN_UV, 0.0);
	
	float grayscale_value = dot(input_color.rgb, vec3(0.299, 0.587, 0.114));
	vec3 sampled_color;
	if (temperature > 0.0){
		sampled_color = texture(warm_color, vec2(grayscale_value, 0.0)).rgb;
		COLOR.rgb = mix(input_color.rgb, sampled_color, temperature);
	}
	else{
		sampled_color = texture(cool_color, vec2(grayscale_value, 0.0)).rgb;
		COLOR.rgb = mix(input_color.rgb, sampled_color, temperature * -1.0);
	}
	COLOR.a = input_color.a;
}