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Diffstat (limited to 'pammasksharpen.html')
| -rw-r--r-- | pammasksharpen.html | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/pammasksharpen.html b/pammasksharpen.html index 70b17bb6..d10a0805 100644 --- a/pammasksharpen.html +++ b/pammasksharpen.html @@ -40,7 +40,7 @@ via an unsharp mask, which you supply as another Netpbm image. <p>An unsharp mask is generally a blurred version of the original image. The sharpening computation is this: Calculate the -"edgeness" of a sample in the input image as the signed +"edgeness" of a sample in the input image as the signed difference between the sample value and the corresponding sample in the unsharp mask. This tells how different the pixel is from its neighbors. Add a multiple of the edgeness to the original sample to @@ -64,7 +64,7 @@ number of pixels. <p>When you create an unsharp mask like this, you will have to choose the side length of the convolution kernel. That length implements the parameter of unsharp mask sharpening usually known as -"radius." In particular, a radius of R pixels corresponds to a +"radius." In particular, a radius of R pixels corresponds to a convolution kernel 2R+1 pixels on a side. <p>Radius is a very important parameter; you can ruin an image with a @@ -89,7 +89,7 @@ of edgeness that gets added to each sample as described above. <p><i>realnum</i> is a nonnegative real decimal number. Zero means no sharpening at all. -<p>This parameter is known as "amount" in ImageMagick. +<p>This parameter is known as "amount" in ImageMagick. <p>The default is 1.0. |