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--- isp:sharpness [2019/05/08 17:32] – created Igor Yefmov
+++ isp:sharpness [2022/04/04 23:32] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Sharpness ======
-We define sharpness as the difference of brightness (the pixel's ''L'' component in HSL color space) from a pixel to its neighboring pixels.
+We define sharpness as the difference of brightness (the pixel's \(L\) component in HSL color space) from a pixel to its neighboring pixels.
-Sharpness for each pixel is calculated based on the values of immediately surrounding it pixels, only the luma component ''L'' is used for this calculation.
+Sharpness for each pixel is calculated based on the values of immediately surrounding it pixels, only the luma component \(L\) is used for this calculation.
-A pixel's new value is calculated based on the simple matrix (see below) with a little twist: the central coefficient of 5 is adjusted based on the new value of sharpness as follows: ''coef_5 = 5 + sharpness'', where ''sharpness'' is in range ''[-1..+1]''.
+A pixel's new value is calculated based on the simple matrix (see below) with a little twist: the central coefficient of 5 is adjusted based on the new value of sharpness as follows: \(coef_5 = 5 + sharpness\), where \(sharpness\) is in range \([-1..+1]\).
+\[
+\left[ {\begin{array}{ccc}
+& -1 & 0 \\
+ -1 & coef_5 & -1 \\
+& -1 & 0 \\
+\end{array} } \right]
+ \]
-|  ''0''  |  ''-1''  |  ''0''  |
-|  ''-1''  |  **''coef_5''**  |  ''-1''  |
-|  ''0''  |  ''-1''  |  ''0''  |

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