Nope, there's no color picker in the standard Blender image editor, but it's one of the 302 features in CommandBox (part of a growing ecosystem of CommandBox for Blender).
Built-in features of commandbox for blender
▶Reset Mesh Viewport Display Color
▶Reference Image Auto Color Picker Panel
▶Reset Mesh Viewport Display Color
▶Toggle Mesh Viewport Display Wireframe
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