Thank you for pointing this out. This is now documented:
http://sumo.dlr.de/wiki/Definition_of_Vehicles,_Vehicle_Types,_and_Routes#Colors
regards,
Jakob

2017-06-12 19:25 GMT+02:00 Marcus Müller via sumo-user <
[email protected]>:

> Hello Jakob,
>
> thank you for your help. Thanks to you I could finally manage to achieve
> the desired result. For others who might be looking for a similar thing, I
> post the solution here,
> as the part with the alpha channel was a bit tricky for me to find:
>
> <vType id="invisible" accel="0.8" decel="4.5" sigma="0.5" length="5"
> minGap="1.5" maxSpeed="70" imgFile="S5.png" color="1,0,0,0" />
>
> The fourth color-channel is the alpha.
>
> Best regards,
> Marcus
>
> 2017-06-11 21:34 GMT+02:00 Jakob Erdmann <[email protected]>:
>
> > Hello,
> > Set the vehicle type to one with attribute imgFile and color transparent,
> > use vehicle gui settings 'show as raster images' (this will use simple
> > shapes if no images are defined). Any image will do when setting full
> > transparency.
> > regards,
> > Jakob
> >
> >
> >
> > 2017-06-11 15:51 GMT+02:00 Marcus Müller via sumo-user <
> > [email protected]>:
> >
> >> Dear sumo-users & developers,
> >>
> >> I am looking for a way to remove single vehicles from a scene before
> >> taking a screenshot. I don't wan't to remove the cars from the
> simulation -
> >> but I am searching for something like switching the visibility of a
> vehicle
> >> on and off. I was looking into the gui_scheme functionality as well as
> the
> >> vehicle shape, but didn't find a proper solition yet.
> >>
> >> Another approach could be to move the vehicle out of the current camera
> >> view, take a screenshot and move it back afterwards. But I hope you know
> >> something better, such as setting the vehicle color to transparent or
> >> something similar.
> >>
> >> Best regards,
> >> Marcus
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> >
> >
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