how to implement color switcher for each image

I'm developing e-commerce website in cakephp 2.x, in which admin can upload many images and each image will have individual color. " Problem is how to give option to admin to choose color for each image." like

image A has color black, 
Image B has color Blue, 
Image C has color grey

echo $this->Form->input('Color'); convert into drop down list to select color(Colors are saved in database). I'm confuse how to display drop down menu to admin against each image to select. if i use it multiple time $this->Form->input('Color'); , it creates with same id and in controller only one color is received. if i use $this->Form->input('Color',$i); to create drop down with different id then it not convert into drop down . it is just text field(because field name does not match and cakephp does not convert it into drop down list), so any suggestion will be appreciated.

Well in that case, put the dropdown options manually:

foreach($images as $key => $image) {
    echo $this->Form->input('Color.' . $key, array(
        'options' => $colors,
    ));
}