PaintShop file format - Revision history

AtariWikiSysop: 4 revisions imported

2018-06-03T23:00:54Z

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Lp at 17:39, 25 January 2017

2017-01-25T17:39:40Z

Lp: Typos

2017-01-25T17:37:43Z

Typos

Lp at 01:59, 25 January 2017

2017-01-25T01:59:12Z

Lp: New page

2017-01-24T21:38:14Z

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<pre>
PaintShop plus *.PSC (st high resolution)
*.DA4 (st high resolution, double height)

*.DA4 files as 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
1 word image height in pixels - 1
--------
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.
</pre>
Back to [[ST Picture Formats]]

← Older revision	Revision as of 23:00, 3 June 2018
(No difference)

@@ Line 29: / Line 29: @@
     copy line above (next byte + 256 + 1) times
     copy from stream 80 * 400 lines (full image)
-    fill next line with (next byte) as line style [(b <<8 ) | b]
+    fill next line with (next byte) as line style [(b << 8 ) | b]
     fill next line with (next 2 bytes) as line style [(b1 << 8) | b2]
     copy from stream 80 bytes to current line

@@ Line 3: / Line 3: @@
                    *.DA4 (st high resolution, double height)
-*.DA4 files as simple screen dumps:
+*.DA4 files are simple screen dumps:
 bytes    image data (uncompressed, thus 640x800)

@@ Line 15: / Line 15: @@
 byte      ? [always 2]
 byte      ? [always 1]
-word      image width in pixels - 1
+word      image width in pixels - 1 [always 639]
-word      image height in pixels - 1
+word      image height in pixels - 1 [always 399]
 --------
 bytes    total for header