COLOR RENDER BUG

DaveBrillhart -

Two quick notes.

1. You don't have to mention me to get the attention of Garmin. Just post your issue. There are at least 4 of us who read the forums and file bugs/tasks/feature requests for the issues presented.
2. If you think you've found a bug, post it in the ConnectIQ Bug Reports forum area.

Now, on to the meat of the discussion.

The palettized color system will select the nearest color in the device color palette to the given color. In this case the device colors are black (0x000000) and white (0xFFFFFF). For the color purlple (0xAA00FF), the distance to black is:

var black_r = 0x00; /*   0 */ // red component
var black_g = 0x00; /*   0 */ // green component
var black_b = 0x00; /*   0 */ // blue component

var purple_r = 0xAA; /* 170 */
var purple_g = 0x00; /*   0 */
var purple_b = 0xFF; /* 255 */

var distance_squared = (purple_r - black_r) * (purple_r - black_r) +
                       (purple_g - black_g) * (purple_g - black_g) +
                       (purple_b - black_b) * (purple_b - black_b);
                       
// (170 - 0) * (170 - 0) +
// (  0 - 0) * (  0 - 0) +
// (255 - 0) * (255 - 0)

// (170) * (170) +
// (  0) * (  0) +
// (255) * (255)

// 28900
// 0
// 65025

// 93925

and the distance to white is:

var white_r = 0xFF; /* 255 */ // red component
var white_g = 0xFF; /* 255 */ // green component
var white_b = 0xFF; /* 255 */ // blue component

var purple_r = 0xAA; /* 170 */
var purple_g = 0x00; /*   0 */
var purple_b = 0xFF; /* 255 */

var distance_squared = (purple_r - white_r) * (purple_r - white_r) +
                       (purple_g - white_g) * (purple_g - white_g) +
                       (purple_b - white_b) * (purple_b - white_b);
                       
// (170 - 255) * (170 - 255) +
// (  0 - 255) * (  0 - 255) +
// (255 - 255) * (255 - 255)

// ( -85) * ( -85) +
// (-255) * (-255) +
// (   0) * (   0)

// 7225 +
// 65025 +
// 0

// 72250

The distance from purple to white (72250) is less than the distance from purple to black (93925), so the system chooses to use white.