# Re: [NTG-context] How to achieve transparency?

```On 14-5-2010 3:16, Henning Hraban Ramm wrote:
```
```Am 2010-05-13 um 22:57 schrieb Hans Hagen:
```
```r = red channel
g = green channel
b = blue channel```
```
c = cyan channel
m = magenta channel
y = yellow channel
k = black channel

s = saturation
v = value (or so)

h = hex (i'll add x for hex as well)

a = alternative
t = transparency factor

s = gray value

p = spotcolor percentage
e = spotcolorname

<name 1> = duotone 1
<name 2> = duotone 2

```
```
I wikified that:
http://wiki.contextgarden.net/Reference/en/definecolor

But how's it possible that h and s have two meanings? Does HSB mode work
at all? (Didn't try.)
```
```
hsv should work (it's the 'v' that triggers the meaning)

```
```What means "alternative"? (So far I only know that it should be 1 for
transparency.)
```
```
\definetransparency [none]        [0]
\definetransparency [normal]      [1]
\definetransparency [multiply]    [2]
\definetransparency [screen]      [3]
\definetransparency [overlay]     [4]
\definetransparency [softlight]   [5]
\definetransparency [hardlight]   [6]
\definetransparency [colordodge]  [7]
\definetransparency [colorburn]   [8]
\definetransparency [darken]      [9]
\definetransparency [lighten]    [10]
\definetransparency [difference] [11]
\definetransparency [exclusion]  [12]

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