Hi,
on the mini sprint of the last weekend we decided to put the new Color
class into the main tree. It is now available in rev. 1251 of the SVN
tree and will make its way into 1.8.1.
So what are its benefits? Extensibility and features of course. The
Color class replaces the previously used 4-value color tuples throughout
the whole pygame framework. To maintain backwards compatibility, any
function, object and method taking a color argument now can take either
the old-style tuple or a Color.
For creation of a Color, you can define each RGBA part separately, use
the predefined color names or an integer value, which _must_ represent
all four parts (otherwise you'll wonder, why the alpha has a value, but
the red not :-).
c = pygame.Color (10, 20, 30, 40)
c = pygame.Color ("red")
c = pygame.Color (0xCCAA90FF)
Colors also support several arithmetic operations, namely addition,
subtraction, multiplication, division, modulo operations and inversion
(those are currently not implemented as inplace operations, though).
You can normalize colors, receiving a tuple with a value range between 0
and 1, correct their gamma values or use different color space
representations, such as HLSA, HSVA and YUV. You also convert them to an
integer, long, float, hexadecimal and octal representation.
The color space representations are implemented as attributes using
a tuple and let you retrieve or assign the respective representation.
y, u, v = color.yuv
...
color.yuv = (y, u, v)
As well as the normalized representation, the different color space
representations are within the range between 0 and 1.
On updating, please remove the color.py file from your existing pygame
installation in case you are installing over it without prior removal of
the package.
Rene mentioned that a CMYK representation would be nice. I am unsure
about the legal state of the RGB(A) to CMYK conversion though. Back in
the 90s, EFI (I think) sued several companies and product developers,
who supported RGB to CMYK conversion routines. Does someone know, if
they still hold those weird rights, or is it safe to add such
routines nowadays?
Regards
Marcus
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