Comments fix

README.md

@@ -3,8 +3,8 @@
 Package imaging provides basic image manipulation functions 
 (resize, rotate, crop, etc.) as well as simplified image loading and saving.
 This package is based on the standard Go image package. All the image 
-manipulation functions provided by the package take any type of image that 
-implements image.Image interface, and return a new image of 
+manipulation functions provided by the package take any image type that 
+implements `image.Image` interface, and return a new image of 
 `*image.NRGBA` type (32 bit RGBA colors, not premultiplied by alpha). 
 
 ###Recent changes

imaging.go

@@ -2,7 +2,9 @@
 // (resize, rotate, crop, etc.) as well as simplified image loading and saving.
 // 
 // This package is based on the standard Go image package. All the image 
-// manipulation functions provided by the package return a new *image.NRGBA.
+// manipulation functions provided by the package take any image type that 
+// implements image.Image interface, and return a new image of 
+// *image.NRGBA type (32 bit RGBA colors, not premultiplied by alpha).
 package imaging
 
 import (
@@ -515,7 +517,7 @@ func FlipV(img image.Image) *image.NRGBA {
 	return dst
 }
 
-// Antialias filter for Resize is a basic quadratic function.
+// Anti-aliasing filter for Resize is a cubic function.
 func antialiasFilter(x float64) float64 {
 	x = math.Abs(x)
 	if x <= 1.0 {
@@ -623,11 +625,11 @@ func Resize(img image.Image, width, height int) *image.NRGBA {
 
 				weight := antialiasFilter((float64(y) - fy) / radiusY)
 				weightSum += weight
+
 				r += (rTmp / weightSumTmp) * weight
 				g += (gTmp / weightSumTmp) * weight
 				b += (bTmp / weightSumTmp) * weight
 				a += (aTmp / weightSumTmp) * weight
-
 			}
 
 			r = math.Min(r/weightSum, 255.0)