Different wearable products can have different color depths. The least number of colors a product will have is 16. The RGB values of the available colors on the 16 color products are as follows...
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Using these colors for your bitmaps will make your app the most portable.
While each device has a unique palette the developer can specify a palette to use for an image.
The resource compiler will map the colors that are defined in the developer’s palette to their closest match in the device palette and use only those colors.I don't care to let the compiler chose a "closest match". Conflicts could lead to loss of detail, or totally inappropriate color.