gistfile1.txt

config/main.php
'image'=>array(
            'class'=>'application.extensions.image.CImageComponent',
            // GD or ImageMagick
            'driver'=>'GD',
            // ImageMagick setup path
//            'params'=>array('directory'=>'/opt/local/bin'),
            'params'=>array('directory'=>'/Applications/MAMP/Library'),
        ),


in Model :

$_path = 'images/uploads/media/org/'.$model->image->name;

 $image = Yii::app()->image->load($_path);

                    if($style->crop == 1){
                        $image->crop($style->crop_width,$style->crop_height);
                    }

                    if($style->quality == 1){
                        $image->quality($style->quality_range);
                    }

                    if($style->sharpen == 1){
                        $image->sharpen($style->sharpen_range);
                    }