Python RGB array to HSL and back
One option is to use OpenCV. Their Python bindings are pretty good (although not amazing). The upside is that it is a very powerful library, so this would just be the tip of the iceberg.
You could probably also do this very efficiently using numpy.
well i've seen some code to convert RGB to HSL; but how to do it fast in python.
Its strange to me, that for example photoshop does this within a second on a image, while in python this often takes forever. Well at least the code i use; so think i'm using wrong code to do it
In my case my image is a simple but big raw array [r,g,b,r,g,b,r,g,b ....]
I would like this to be [h,s,l,h,s,l,h,s,l .......]
Also i would like to be able to do hsl to rgb
the image is actually 640x 480 pixels; 
Would it require some library or wrapper around c code (i never created a wrapper) to get it done fast ?