unable to resize the image correctly


I am having problem with UIImage resizing, image masking is working fine but after applying mask UIImage is starched, the problem is with scaling as image is not scaled properly.

CCClippingNode *clippingNode = [[CCClippingNode alloc] initWithStencil:pMaskingFrame ];
pTobeMasked.scaleX = (float)pMaskingFrame.contentSize.width / (float)pTobeMasked.contentSize.width;
pTobeMasked.scaleY = (float)pMaskingFrame.contentSize.height / (float)pTobeMasked.contentSize.height;
clippingNode.alphaThreshold = 0;
[pContainerNode addChild:clippingNode];
pTobeMasked.position = ccp(pMaskingFrame.position.x, pMaskingFrame.position.y);
[clippingNode addChild:pTobeMasked];

One of my project I have used below function to resize an image;

     method parameters definition
     image : original image to be resized
     size  : new size
+ (UIImage*)resizeImage:(UIImage *)image size:(CGSize)size
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    //here is the scaled image which has been changed to the size specified
    return newImage;