Difference between revisions of "PaintShop file format"
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*.DA4 (st high resolution, double height) | *.DA4 (st high resolution, double height) | ||
| − | *.DA4 files | + | *.DA4 files are simple screen dumps: |
64000 bytes image data (uncompressed, thus 640x800) | 64000 bytes image data (uncompressed, thus 640x800) | ||
| Line 15: | Line 15: | ||
1 byte ? [always 2] | 1 byte ? [always 2] | ||
1 byte ? [always 1] | 1 byte ? [always 1] | ||
| − | 1 word image width in pixels - 1 | + | 1 word image width in pixels - 1 [always 639] |
| − | 1 word image height in pixels - 1 | + | 1 word image height in pixels - 1 [always 399] |
-------- | -------- | ||
14 bytes total for header | 14 bytes total for header | ||
| Line 29: | Line 29: | ||
12 copy line above (next byte + 256 + 1) times | 12 copy line above (next byte + 256 + 1) times | ||
99 copy from stream 80 * 400 lines (full image) | 99 copy from stream 80 * 400 lines (full image) | ||
| − | 100 fill next line with (next byte) as line style [(b <<8 ) | b] | + | 100 fill next line with (next byte) as line style [(b << 8 ) | b] |
102 fill next line with (next 2 bytes) as line style [(b1 << 8) | b2] | 102 fill next line with (next 2 bytes) as line style [(b1 << 8) | b2] | ||
110 copy from stream 80 bytes to current line | 110 copy from stream 80 bytes to current line | ||
Latest revision as of 01:00, 4 June 2018
PaintShop plus *.PSC (st high resolution)
*.DA4 (st high resolution, double height)
*.DA4 files are simple screen dumps:
64000 bytes image data (uncompressed, thus 640x800)
-----------
64000 bytes total for file
*.PSC files are compressed:
6 bytes file id ["tm89PS"]
1 word version [0xCB = 2.03]
1 byte ? [always 2]
1 byte ? [always 1]
1 word image width in pixels - 1 [always 639]
1 word image height in pixels - 1 [always 399]
--------
14 bytes total for header
? image data:
The image data is not compressed based on pixels, but rather scan lines. Starting at the
top and working downward. There are 9 unique codes:
Codes:
0 set current line all white (0x00)
10 copy line above (next byte + 1) times
12 copy line above (next byte + 256 + 1) times
99 copy from stream 80 * 400 lines (full image)
100 fill next line with (next byte) as line style [(b << 8 ) | b]
102 fill next line with (next 2 bytes) as line style [(b1 << 8) | b2]
110 copy from stream 80 bytes to current line
200 set current line all black (0xFF)
255 marks end of file (stop process codes)
'line style' mentioned above is a reference to VDI function vsl_udsty(), set user-defined
line style pattern. Essentially, fill that line with the bit pattern.
Back to ST Picture Formats
