Use darker colors for artist images

[mueller-ma]

Fixes #983

[adrian-bl]

Is this based on an official color palette?

We are currently using the material color palette - which seems to be a sane choice for android.

[mueller-ma]

I used a website to make the colors 20% darker. Some of them 40%, because 20% wasn't enough.
You're talking about the color table on https://material.io/design/color/the-color-system.html ? I wasn't aware the current colors are based on these colors.
I can update the new dark colors according to the material color palettes.

[mueller-ma]

@adrian-bl I updated the colors. The dark colors are now based on material colors if the bright equivalent is also a material color.

[adrian-bl]

thanks, but could you also update 'generate-themes.pl' which is used to assemble the theme XML files?

Did you also test this on api versions < v21?

[mueller-ma]

thanks, but could you also update 'generate-themes.pl' which is used to assemble the theme XML files?

Done!

Did you also test this on api versions < v21?

No, I didn't. I try to find a device <v21 with music on it.

[mueller-ma]

No, I didn't. I try to find a device <v21 with music on it.

I haven't found a suitable device.

[adrian-bl]

I found an android 4.4 device and things seem to work fine - merging.
Thanks!