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/trunk/Filter Factory Compatibility.md
1,5 → 1,3
Implementation detail differences
=================================
74,15 → 72,50
In Filter Foundry 1.7.0.8, the previously undocumented variables I, U, V as well as imin, umin, vmin
have been changed to represent the actual results of the i,u,v variables:
I, imax = 255 (stayed the same)
U, umax = 55 (was 255 in Filter Factory)
V, vmax = 78 (was 255 in Filter Factory)
imax = 255 (stayed the same)
umax = 55 (was 255 in Filter Factory)
vmax = 78 (was 255 in Filter Factory)
imin = 0 (stayed the same)
umin = -55 (was 0 in Filter Factory)
vmin = -78 (was 0 in Filter Factory)
It is questionable if `I` was meant to be a synonym of `imax`, or if `I` was meant to be `I := imax - imin`.
We have chosen the latter in Filter Foundry 1.7.0.9. Same thing with `U` and `V`.
Therefore:
I := imax-imin = 255
U := umax-umin = 110
V := vmax-vmin = 156
dmin, D (Testcase d_minmax.afs)
-------
**The Filter Factory manual writes:**
0 corresponds to the 3 o'clock position
256 to the 6 o'clock position,
512 to the 9 o'clock position,
768 to the 12 o'clock position,
and 1024 to the full rotation back to the 3 o'clock position
But this does not match the Windows implementation of Filter Factory
(maybe it is true to the Mac implementation?)
**In the original Windows implementation we can observe:**
d=-512 is at 9 o'clock position
d=-256 is at 12 o'clock position
d=0 is at 3 o'clock position
d=256 is at 6 o'clock position
d=512 is the full rotation back to 3 o'clock position
Therefore, `dmin` has been changed from 0 to -512,
and `D`, `dmax` has been changed from 1024 to 512.
get(i) (Testcase getput.afs)
------