Hello,
As far as I remember Fenix 7 supports 256 colors, however unlike e.g. the Fenix 6 - which has its colors spelled out in the 'palette' section of its compiler.json - the Fenix 7 does not have a 'palette' section in is compiler.json.
And so how can one find out what colors a given device supports if they are not specified in its compiler.json ?
Maybe you should do a bug report instead of posting a short story!
Oops, my bad for posting all the relevant information I could find relating to the question at hand.
Next time I'll just…
Have you ever actually tried this yourself? I have.
Then you could've just said that, instead of simply pointing to docs which don't actually say what you implied they say or what you followed…
Fenix7 also has bitsPerPixel: 8
Also if I remember correctly then there are 2 types of palette64, with 62 or 63 colors being identical and have 1 color difference. At least that's what I found from compiler…
See https://developer.garmin.com/connect-iq/compatible-devices/
Per that, the f7 is 64 colors
Unfortunately there is conflicting information in the Garmin documentation (shocker!)
[https://developer.garmin.com/connect-iq/compatible-devices/]
[https://developer.garmin.com/connect-iq/reference-guides/devices-reference/]
Neither page shows the actual palette (available colors) for Fenix 7 or any other devices which lack palette information in compiler.json (seems to be all devices where "enhancedGraphicSupport" is true). The devices reference page does show the palette for devices which do have the palette in compiler.json, but that obviously doesn't help.
Maybe you should do a bug report instead of posting a short story! 
