- ((rgb8_t *)imageData)[i].r = background;
- ((rgb8_t *)imageData)[i].g = background;
- ((rgb8_t *)imageData)[i].b = background;
+ ((rgb8_t *)imageData)[i].r = (unsigned char)background;
+ ((rgb8_t *)imageData)[i].g = (unsigned char)background;
+ ((rgb8_t *)imageData)[i].b = (unsigned char)background;