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2017-01-02T23:49:04Z

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<pre>
Tiny *.TNY (any resolution)
*.TN1 (low resolution)
*.TN2 (medium resolution)
*.TN3 (high resolution)

Several people have reported sightings of mutated Tiny pictures that
do not follow the standard format, so let's be careful out there. What
is described here is the format that David Mumper's original
TNYSTUFF.PRG produces. The TN4 extension has been found on animated low
resolution files. One can assume the same person(s) will also use TN5 and
TN6 for extensions for animated medium and high resolution.

1 byte resolution (same as NEO, but +3 indicates rotation
information also follows)

If resolution > 2 {
1 byte left and right color animation limits. High 4 bits
hold left (start) limit; low 4 bits hold right (end) limit
1 byte direction and speed of color animation (negative value
indicates left, positive indicates right, absolute value
is delay in 1/60's of a second.
1 word color rotation duration (number of iterations)
}

16 words palette
1 word number of control bytes
1 word number of data words
3-10667 bytes control bytes
1-16000 words data words
-------------
42-32044 bytes total

Control byte meanings:

For a given control byte, x:

x < 0 Copy -x of unique words to take from the data section
(from 1 to 128)
x = 0 1 word is taken from the control section which specifies
the number of times to repeat the next data word (from
128 to 32767)
x = 1 1 word is taken from the control section which specifies
the number of unique words to be taken from the data
section (from 128 - 32767)
x > 1 Specifies the number of times to repeat the next word
taken from the data section (from 2 to 127)

Format of expanded data:

The expanded data is not simply screen memory bitmap data; instead, the
data is divided into four sets of vertical columns. (This results in
better compression.) A column consists of one specific word taken
from each scan line, going from top to bottom. For example, column 1
consists of word 1 on scanline 1 followed by word 1 on scanline 2, etc.,
followed by word 1 on scanline 200.
The columns appear in the following order:

1st set contains columns 1, 5, 9, 13, ..., 69, 73, 77 in order
2nd set contains columns 2, 6, 10, 14, ..., 70, 74, 78 in order
3rd set contains columns 3, 7, 11, 15, ..., 71, 75, 79 in order
4th set contains columns 4, 8, 12, 16, ..., 72, 76, 80 in order

Note that Tiny partitions the screen this way regardless of resolution; i.e.,
these aren't bitplanes. For example, medium resolution only has two bitplanes,
but Tiny still divides medium resolution pictures into four parts.
</pre>
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Tiny file format - Revision history

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