Color Model

[C. Ecker]

Hi all,

Since there is the problem with half finished transparency anyway, it is a
good time for thinking about skencil's color model. There are two issues I
want to put under consideration:

- CMYK: would be great to have. AFAIK, it requires to change the internal
representation of the color, because CMYK contains additional information
compared to RGB, i.e. by transforming a color from CMYK to RGB information
is lost. Therefore each color in skencil should be represented internaly
in CMYK-format instead of RGB as it is now.

- Transparency: In 0.7 transparency is limited to the fill. Is there a
reason for not allowing transparency also for the line color attribute ?
In other applications transparency and color values are always bundled,
i.e.  everywhere a color appears there is an associated transparency
value. As a consequence it is then possible to have gradient fills with
e.g. the transparency varying from transparent to opaque.

  The "bundling" would mean to either directly implemented transparency
into the color model or to introduce additional transparency parameters
for the line color and gradients points.

Are there any arguments for or against changing the current implementation
?

  Christof