GodotCanvasEffects

Some canvas effects may be useful to you project

Effect	Screentshoot	params	extra
Vignette		effect_color, radius, width
Grayscale		effect_factor
Pixel		effect_factor
Spedia		effect_color, effect_factor
Nega		effect_factor
Gradient		color_ul, color_ur, color_bl, color_br, effect_factor
Dissolve		color, width, noise_texture	need a noise texture, use a NoiseTexture in this demo
Shiny		effect_color, effect_strength, effect_offset, rotation, width, softness	change shader param effect_offset with time to make animation effect
Blur		strength	may cost a lot of time on mobile
Outline		effect_color, border
Shadow		effect_color, x_offset, y_offset

Usage

Download the shader files and put it in your project, select the canvas node in your project , create a new material for it, add load shader from file(for dissolve effect, you can use the dissolve material direct and assign youself's noise texture).