I think many image edit software (i.e. Paint Shop Pro) has functions like "Color Replacer" and "Magic Wand".
If your image edit software has the "Color Replacer" function, then you can just replace the background color green with the color rose.
If your image edit software has the "Magic Wand" function, then you can remove the background color green and then use the "Color Replacer" to make the background rose color.