Projects/Liberty/File Formats/Janome Embroidery Format: Difference between revisions
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Revision as of 18:50, 31 July 2012
Janome Embroidery Format
The Janome Embroidery Format .jef (and .sow) files contain a header and stitch instructions, but does not contain any obvious signature bytes. The only signature is to see if the thread change table is the correct size and the file length is right for the number of thread changes and the number of stitches. For the .jef+ format there is extra data after the thread tables, then the 32bit aligned string "JANO", "ME\0\0", then a 32bit number (1 for a 1 thread pattern), then a 32bit bitmap-start offset which ruins the .jef 'signature', but now we have the string "JANOME".
The header contains a date, number of thread changes, number of stitches, stitch extent rectangle, other optional rectangles, and two thread change tables (the first is thread colour). The stitch instructions are pairs of 8 bit offsets (starting from the centre of the design) with an escape sequence for move, thread change, and end of pattern.
| Offset | Description |
|---|---|
| 0x0000 | Stitch-start offset |
| 0x0004 | Flags, domain: 0x1, 0xa |
| 0x0008 | Date ASCII YYYY |
| 0x000C | Date ASCII MMDD |
| 0x0010 | TIME ASCII HHMM |
| 0x0014 | TIME ASCII SS00 |
| 0x0018 | Thread-load-count |
| 0x001C | Stitch-count |
| 0x0020 | Hoop-code, domain: 0 "A 126mm x 110mm", 1 "C 50mm x 50mm", 2 "B 140mm x 200mm", 3, 4 |
| 0x0024 | Stitch-extent-left 0.1mm units from centre |
| 0x0028 | Stitch-extent-top |
| 0x002C | Stitch-extent-right |
| 0x0030 | Stitch-extent-bottom |
| 0x0034 | box2-left -- minus 1 appears to indicate not used |
| 0x0038 | box2-top |
| 0x003C | box2-right |
| 0x0040 | box2-bottom |
| 0x0044 | box3-left |
| 0x0048 | box3-top |
| 0x004C | box3-right |
| 0x0050 | box3-bottom |
| 0x0054 | box4-left |
| 0x0058 | box4-top |
| 0x005C | box4-right |
| 0x0060 | box4-bottom |
| 0x0064 | box5-left |
| 0x0068 | box5-top |
| 0x006C | box5-right |
| 0x0070 | box5-bottom |
| 0x0074 | thread-colour-table, domain: 0x01 - 0x4e -- there are **79** colours in the Janome catalogue |
| + | Thread-load-count * 4 |
| + | 0x0000 thread-type-table, domain: 0xd |
| + | Thread-load-count * 4 |
| + | 0x0000 jef plus zero |
| + | 0x0004 jef plus zero |
| + | 0x0008 jef plus "JANO" |
| + | 0x000C jef plus "ME" |
| + | 0x0010 jef plus bitmap-count (may be) |
| + | 0x0014 jef plus bitmap-start offset |
| ... | |
| Stitch- | start stitch-table pairs of signed 8bit values, either 0x80 and command or dx and dy |
| ... | |
| bitmap- | start jef plus bitmap |