1 Upload image
2 Frame
3 Preview
Approximation of what the Halcyon display renders after dither + channel swap + device quantisation.
4 Export
Heads up: the downloaded file will look wrong when opened in a normal image viewer — its red and green channels are pre-swapped for the Halcyon's display pipeline, so it will only render correctly on the dive computer itself. The preview above is the accurate representation.
320×240, 24-bit uncompressed BMP3, ~225 KB. Copy to the root of the computer's splash directory.