IOS CGBitmapContextCreate Large bitmap
===

    CGContextRef context =  CGBitmapContextCreate(nil,
            width, //if width More than 6002/4
            height, 
            8,
            width*4,//if width*4 > 6002
            colorSpace,
            kCGImageAlphaPremultipliedFirst |kCGBitmapByteOrder32Little );

i want to make a large bitmap(width <= 2500) when width*4>6002 has a error for that

    <Error>: CGBitmapContextCreate: unsupported parameter combination: 
    8 integer bits/component;  32 bits/pixel; 
    3-component color space; kCGImageAlphaPremultipliedFirst; 6002 bytes/row.

how to make the large bitmap 
thanks.
