Просмотр кода страницы AHSL

== Конвертация ==

=== из RGB в AHSL ===
<math>
H =
\begin{cases}
0 & \mbox{if } MAX = MIN \\
60^\circ \times \frac{G - B}{MAX - MIN} + 0^\circ,   & \mbox{if } MAX = R  \\ &\mbox{and } G \ge B \\
60^\circ \times \frac{G - B}{MAX - MIN} + 360^\circ,   & \mbox{if } MAX = R \\ &\mbox{and } G < B \\
60^\circ \times \frac{B - R}{MAX - MIN} + 120^\circ, & \mbox{if } MAX = G \\
60^\circ \times \frac{R - G}{MAX - MIN} + 240^\circ, & \mbox{if } MAX = B
\end{cases}
</math>
<br>
<math>
GRAY = \frac{R+G+B}{3}
</math>
<br>
<math>
R_0=0,~G_0=0,~B_0=0
</math>
<br>
<math>
\mbox{if (} H>=0 \mbox{ and } H<=60 \mbox{) } R_0=255,~G_0=4.25 \times H
</math>
<br>
<math>
\mbox{if (} H>60 \mbox{ and } H<=120 \mbox{) } G_0=255,~R_0=255-4.25 \times (H-60)
</math>
<br>
<math>
\mbox{if (} H>120 \mbox{ and } H<=180 \mbox{) } G_0=255,~B_0=4.25 \times (H-120)
</math>
<br>
<math>
\mbox{if (} H>180 \mbox{ and } H<=240 \mbox{) } B_0=255,~G_0=255-4.25 \times (H-180)
</math>
<br>
<math>
\mbox{if (} H>240 \mbox{ and } H<=300 \mbox{) } B_0=255,~R_0=4.25 \times (H-240)
</math>
<br>
<math>
\mbox{if (} H>300 \mbox{ and } H<=360 \mbox{) } R_0=255,~B_0=255-4.25 \times (H-300)
</math>
<br>
<math>
GRAY_0 = \frac{R_0+G_0+B_0}{3}
</math>
<br>
<math>
L =
\begin{cases}
0 & \mbox{if } GRAY = GRAY_0 \\
\frac{100 \times (GRAY-GRAY_0)}{255-GRAY_0},   & \mbox{if } GRAY > GRAY_0 \\
\frac{100 \times (GRAY-GRAY_0)}{GRAY_0},   & \mbox{if } GRAY < GRAY_0 \\
\end{cases}
</math>
<br>
<math>
\mbox{if (} L>0 \mbox{) }R_0=R_0+\frac{L \times (255-R_0)}{100}
</math>
<br>
<math>
\mbox{if (} L<0 \mbox{) }R_0=R_0+\frac{L \times R_0}{100}
</math>
<br>
<math>
S =
\begin{cases}
0, & \mbox{if } R = GRAY \\
\frac{255 \times \left |R-GRAY\right |}{\left |R_0-GRAY\right |},   & \mbox{if } R \ne GRAY \\
\end{cases}
</math>
<br>

=== из AHSL в RGB ===
<math>
R=0,~G=0,~B=0
</math>
<br>
<math>
\mbox{if (} H>=0 \mbox{ and } H<=60 \mbox{) } R=255,~G=4.25 \times H
</math>
<br>
<math>
\mbox{if (} H>60 \mbox{ and } H<=120 \mbox{) } G=255,~R=255-4.25 \times (H-60)
</math>
<br>
<math>
\mbox{if (} H>120 \mbox{ and } H<=180 \mbox{) } G=255,~B=4.25 \times (H-120)
</math>
<br>
<math>
\mbox{if (} H>180 \mbox{ and } H<=240 \mbox{) } B=255,~G=255-4.25 \times (H-180)
</math>
<br>
<math>
\mbox{if (} H>240 \mbox{ and } H<=300 \mbox{) } B=255,~R=4.25 \times (H-240)
</math>
<br>
<math>
\mbox{if (} H>300 \mbox{ and } H<=360 \mbox{) } R=255,~B=255-4.25 \times (H-300)
</math>
<br>
<math>
\mbox{if } L>0 \mbox{, }
\begin{cases}
R=R+\frac{L \times (255-R)}{100} \\
G=G+\frac{L \times (255-G)}{100} \\
B=B+\frac{L \times (255-B)}{100} \\
\end{cases}
</math>
<br>
<math>
\mbox{if } L<0 \mbox{, }
\begin{cases}
R=R+\frac{L \times R}{100} \\
G=G+\frac{L \times G}{100} \\
B=B+\frac{L \times B}{100} \\
\end{cases}
</math>
<br>
<math>
GRAY=\frac{R+G+B}{3}
</math>
<br>
<math>R=GRAY+\frac{S\times(R-GRAY)}{255}</math><br>
<math>G=GRAY+\frac{S\times(G-GRAY)}{255}</math><br>
<math>B=GRAY+\frac{S\times(B-GRAY)}{255}</math><br>