How to achieve transparency?

How to achieve transparency?

[Marco]

Hi,

I wonder how transparency works in ConTeXt. I expect in the following
example the text to be transparent. That's not the case.

\definecolor   [myI]  [r=1, g=.9, b=.7, a=.8]
\definecolor   [myII] [r=0, g=.9, b=0,  a=.8]
\setupbodyfont [sans, 36pt]
\def\t{Test}
\starttext
\bf
\hbox{\color [myI] {\hbox to 0pt{\t}}
  \color [myII] {\t}}
\stoptext

Thanks in advance
Marco


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Re: How to achieve transparency?

[Hans Hagen]

On 13-5-2010 4:25, Marco wrote:
> Hi,
>
> I wonder how transparency works in ConTeXt. I expect in the following
> example the text to be transparent. That's not the case.
>
> \definecolor   [myI]  [r=1, g=.9, b=.7, a=.8]
> \definecolor   [myII] [r=0, g=.9, b=0,  a=.8]

t=.5, a=1 (a is the method)

> \setupbodyfont [sans, 36pt]
> \def\t{Test}
> \starttext
> \bf
> \hbox{\color [myI] {\hbox to 0pt{\t}}
>    \color [myII] {\t}}
> \stoptext
>
> Thanks in advance
> Marco
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> ___________________________________________________________________________________


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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___________________________________________________________________________________

Re: How to achieve transparency?

[Marco]

> > I wonder how transparency works in ConTeXt. I expect in the
> > following example the text to be transparent. That's not the case.
> >
> > \definecolor   [myI]  [r=1, g=.9, b=.7, a=.8]
> > \definecolor   [myII] [r=0, g=.9, b=0,  a=.8]
> 
> t=.5, a=1 (a is the method)
Oh! I assumed »a« stands for »alpha«. Thanks, Hans. Works as expected
now.

Marco


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Re: How to achieve transparency?

[Hans Hagen]

On 13-5-2010 7:13, Marco wrote:
>>> I wonder how transparency works in ConTeXt. I expect in the
>>> following example the text to be transparent. That's not the case.
>>>
>>> \definecolor   [myI]  [r=1, g=.9, b=.7, a=.8]
>>> \definecolor   [myII] [r=0, g=.9, b=0,  a=.8]
>>
>> t=.5, a=1 (a is the method)
> Oh! I assumed »a« stands for »alpha«. Thanks, Hans. Works as expected
> now.

r = red channel
g = green channel
b = blue channel

c = cyan channel
m = magenta channel
y = yellow channel
k = black channel

h = hue or hexadecimal
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

that's about it

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: How to achieve transparency?

[Marco]

On Thu, 13 May 2010 22:57:50 +0200, Hans Hagen <pragma@wxs.nl> wrote:

> On 13-5-2010 7:13, Marco wrote:
> >>> I wonder how transparency works in ConTeXt. I expect in the
> >>> following example the text to be transparent. That's not the case.
> >>>
> >>> \definecolor   [myI]  [r=1, g=.9, b=.7, a=.8]
> >>> \definecolor   [myII] [r=0, g=.9, b=0,  a=.8]
> >>
> >> t=.5, a=1 (a is the method)
> > Oh! I assumed »a« stands for »alpha«. Thanks, Hans. Works as
> > expected now.
> 
> r = red channel
> g = green channel
> b = blue channel
> 
> c = cyan channel
> m = magenta channel
> y = yellow channel
> k = black channel
> 
> h = hue or hexadecimal
> 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
> 
> that's about it
> 
> Hans
Thanks for the explanation.

Marco


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Re: How to achieve transparency?

[Henning Hraban Ramm]

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
>
> h = hue or hexadecimal
> 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
>
> that's about it

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.)
What means "alternative"? (So far I only know that it should be 1 for  
transparency.)


Greetlings from Lake Constance!
Hraban
---
http://www.fiee.net/texnique/
http://wiki.contextgarden.net
https://www.cacert.org (I'm an assurer)

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___________________________________________________________________________________

Re: How to achieve transparency?

[Hans Hagen]

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
>>
>> h = hue or hexadecimal
>> 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
>>
>> that's about it
>
> 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]


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________