Working with picture color codes

Process picture Color-(uiimage*) Grayscale: (uiimage*) animage type: (int) type{cgimageref imageref = animage.cgimage;    size_t width = cgimagegetwidth (imageref);    size_t height = cgimagegetheight (imageref);    size_t bitspercomponent = cgimagegetbitspercomponent (imageref);    size_t bitsperpixel = Cgimagegetbitsperpixel (imageref);    size_t Bytesperrow = Cgimagegetbytesperrow (imageref);    Cgcolorspaceref colorspace = Cgimagegetcolorspace (imageref);    Cgbitmapinfo bitmapinfo = Cgimagegetbitmapinfo (imageref);    BOOL Shouldinterpolate = Cgimagegetshouldinterpolate (imageref);    Cgcolorrenderingintent Intent = cgimagegetrenderingintent (IMAGEREF);    Cgdataproviderref Dataprovider = Cgimagegetdataprovider (imageref);    Cfdataref data = Cgdataprovidercopydata (Dataprovider);    UInt8 *buffer = (uint8*) cfdatagetbyteptr (data);    Nsuinteger x, y;            for (y = 0, y < height; y++) {for (x = 0; x < width; + x + +) {UInt8 *tmp;      TMP = buffer + y * bytesperrow + x * 4;      UInt8 Red,green,blue;            Red = * (tmp + 0);            Green = * (tmp + 1);            Blue = * (tmp + 2);                        UInt8 brightness;                    Switch (type) {Case 1:brightness = (* * Red + * green + 151 * blue)/256;                    * (tmp + 0) = brightness;                    * (tmp + 1) = brightness;                    * (tmp + 2) = brightness;                Break                    Case 2: * (tmp + 0) = red;                    * (tmp + 1) = green * 0.7;                    * (tmp + 2) = blue * 0.4;                Break                    Case 3: * (tmp + 0) = 255-red;                    * (tmp + 1) = 255-green;                    * (tmp + 2) = 255-blue;                Break                    Default: * (tmp + 0) = red;                    * (tmp + 1) = green;                    * (tmp + 2) = blue;            Break }}} CfdatarEF Effecteddata = cfdatacreate (NULL, buffer, cfdatagetlength (data));    Cgdataproviderref Effecteddataprovider = Cgdataprovidercreatewithcfdata (Effecteddata);                                               Cgimageref effectedcgimage = cgimagecreate (width, height, Bitspercomponent, BitsPerPixel, Bytesperrow, CO Lorspace, Bitmapinfo, Effecteddataprovider, NULL, shouldinterpolate, intent)    ;    UIImage *effectedimage = [[UIImage alloc] initwithcgimage:effectedcgimage];    Cgimagerelease (Effectedcgimage);    Cfrelease (Effecteddataprovider);    Cfrelease (Effecteddata);    Cfrelease (data); return effectedimage;}

Working with picture color codes