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/trunk/Filter Factory Compatibility.txt
3,12 → 3,12
================================= 08 January 2018
FilterFoundry tries to be as compatible with Filter Factory as possible.
However, results are usually not 100% equal, because functions like
cos, sin, sqr, etc. have different accuracy due to the underlying
However, results are usually not 100% equal because functions like
cos, sin, sqr, etc., have different accuracy due to the underlying
implementation.
Furthermore, there are following known differences between Filter Foundry
and Filter Factory:
Furthermore, there are the following known differences between
Filter Foundry and Filter Factory:
i, u, v (Testcase iuv.afs)
-------
25,7 → 25,7
u=(-147407*r-289391*g+436798*b)/2000000 Output range is -55..55
v=614777*r-514799*g-99978*b)/2000000 Output range is -78..78
Both formulas follow the same YUV standard, but have different accuracy.
Both formulas follow the same YUV standard but have different accuracy.
get(i) (Testcase getput.afs)
50,8 → 50,8
rnd(a,b) and rst(i) (Testcases rst_*.afs)
-------------------
Filter Foundry's implementation of rst(i) (undocumented function that sets the seed for the PRG)
and rnd(a,b) (generate random number between a and b, inclusively)
Filter Foundry's implementation of rst(i) (an undocumented function that sets the seed for the PRG)
and rnd(a,b) (generate a random number between a and b, inclusively)
differs from the implementation of Filter Factory in many ways.
1. In Filter Foundry, the random seed is automatically initialized with seed 691204.
65,7 → 65,7
If the argument is not within this range, the operation "and 0x7FFF" will be applied to it
to extract the low 15 bits.
3. In Filter Foundry, the function rnd(a,b) retrieves a random number at realtime; therefore, if the
3. In Filter Foundry, the function rnd(a,b) retrieves a random number in realtime; therefore, if the
seed is changed via rst(i), there is an immediate effect on the next call of the rnd(a,b) function.
For example, following filter would generate an one-colored picture without any randomness:
R: rst(123), rnd(0,255)