EMD

Status

What it is

EMD appears in home-embroidery format lists near Elna and Janome-adjacent workflows.

Satin Studio behavior

Satin Studio documents this format for identification and inspection. It does not open or export the file.

Versions and variants

Treat EMD as its own format until files prove otherwise.

File identification notes

Reported structure includes a 48-byte (0x30) header and signed relative movement records where x == 0x80 introduces control events. Reported controls include:

• 0x2a: stop / color change.
• 0x80: jump.
• 0xfd: end.

Observed structure notes

• Observed EMD files skip a 48-byte (0x30) header before reading stitch records.
• Normal movement is a two-byte signed dx, dy pair. A first byte of 0x80 introduces a one-byte control.
• Observed controls include 0x80 jump followed by signed movement, 0x2A color change, 0x7D ignored marker near origin, 0xAD trim, 0x90 final trim/return marker, and 0xFD end.

Structure sketch

The observed EMD stream has a fixed preamble and two-byte command records:

struct EmdFile<'a> {
    header: [u8; 0x30],
    records: &'a [EmdRecord],
}

enum EmdRecord {
    Stitch { dx: i8, dy: i8 },          // first byte != 0x80
    Jump { dx: i8, dy: i8 },            // 0x80 0x80 followed by movement
    ColorChange,                       // 0x80 0x2A
    IgnoredMarker,                     // 0x80 0x7D
    Trim,                              // 0x80 0xAD or 0x80 0x90
    End,                               // 0x80 0xFD
}

Compatibility evidence

The notes above help identify and inspect the format; they do not imply import or export support. Keep the original file and record the machine and software that produced it.