There should be an icon that indicates the possibility of applying multiple color filters or that there is a menu that includes multiple filters, such as saturation, contrast, black and white, etc.
An icon like this is used in the iOS Photos app to apply filters:
There should be an icon that indicates the possibility of applying multiple color filters or that there is a menu that includes multiple filters, such as saturation, contrast, black and white, etc.
An icon like this is used in the iOS Photos app to apply filters: