Difference between revisions of "TruePaint/Prism Paint file format"
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Prism Paint *.PNT | Prism Paint *.PNT | ||
| − | 1 long $504e5400 'PNT ' TruePaint Magic | + | 1 long $504e5400 'PNT\0' TruePaint Magic |
| − | 1 word $0100 | + | 1 word $0100 ???? file version |
| − | 1 word palette_size | + | 1 word palette_size Might be there in true color |
1 word x_size | 1 word x_size | ||
1 word y_size | 1 word y_size | ||
1 word bits_per_pixel | 1 word bits_per_pixel | ||
| − | 1 word compression, $0000 uncompressed, $0001 | + | 1 word compression, $0000 uncompressed, $0001 packbits compressed |
1 long picture_data_size = ((x_size+15)&0xffff0)*y_size*bits_per_pixel/8 | 1 long picture_data_size = ((x_size+15)&0xffff0)*y_size*bits_per_pixel/8 | ||
(uncompressed) | (uncompressed) | ||
| Line 16: | Line 16: | ||
128 bytes total for header | 128 bytes total for header | ||
| − | 3*palette_size words Palette data, RGB, values 0..1000. The colors are in | + | 3*palette_size words Palette data, RGB, values 0..1000. The colors are in VDI order |
| − | |||
| − | picture_data_size bytes Interleaved bitplanes for bits_per_pixel<16 | + | picture_data_size bytes The line length is a multiple of 16 pixels for all bit depths |
| − | + | Interleaved bitplanes for bits_per_pixel<16 | |
| − | + | 16 bit word per pixel for 16-bit pictures, RRRRrGGGGGgBBBBBb | |
| − | The prism paint compressed format uses the | + | 24 bit is stored R, G, B in that order |
| − | scanline the bitplanes are compressed | + | |
| + | The prism paint compressed format uses the Packbits compression algorithm. For every | ||
| + | scanline the bitplanes are compressed separately. The falcon high-color resolution | ||
(16 bit) is compressed as if there were 16 bitplanes, which there are not. | (16 bit) is compressed as if there were 16 bitplanes, which there are not. | ||
| + | The same rule applies to 24 bits per pixel. | ||
| + | |||
| + | Additional information: | ||
| + | The TruePaint manual describes the format as designed for high speed and only writes | ||
| + | uncompressed files. Prism Paint on the other hand offers compression every time a | ||
| + | file is saved with an alert box (yes/no). | ||
</pre> | </pre> | ||
See also [[PackBits Compression Algorithm]] | See also [[PackBits Compression Algorithm]] | ||
Back to [[ST Picture Formats]] | Back to [[ST Picture Formats]] | ||
Latest revision as of 01:14, 4 June 2018
TruePaint *.TPI
Prism Paint *.PNT
1 long $504e5400 'PNT\0' TruePaint Magic
1 word $0100 ???? file version
1 word palette_size Might be there in true color
1 word x_size
1 word y_size
1 word bits_per_pixel
1 word compression, $0000 uncompressed, $0001 packbits compressed
1 long picture_data_size = ((x_size+15)&0xffff0)*y_size*bits_per_pixel/8
(uncompressed)
108 bytes $0
---------
128 bytes total for header
3*palette_size words Palette data, RGB, values 0..1000. The colors are in VDI order
picture_data_size bytes The line length is a multiple of 16 pixels for all bit depths
Interleaved bitplanes for bits_per_pixel<16
16 bit word per pixel for 16-bit pictures, RRRRrGGGGGgBBBBBb
24 bit is stored R, G, B in that order
The prism paint compressed format uses the Packbits compression algorithm. For every
scanline the bitplanes are compressed separately. The falcon high-color resolution
(16 bit) is compressed as if there were 16 bitplanes, which there are not.
The same rule applies to 24 bits per pixel.
Additional information:
The TruePaint manual describes the format as designed for high speed and only writes
uncompressed files. Prism Paint on the other hand offers compression every time a
file is saved with an alert box (yes/no).
See also PackBits Compression Algorithm
Back to ST Picture Formats
