Hi list.
New user here, just read the Fornari, Latronico, and Manea's "Digital
photo development with darktable". (see:
https://www.darktable.org/resources/) I guess it is a good read for both
novices and not-so-novice but new to darktable, like me. Thank you! And
let me try to thank further with a small correction.
There is a mathematical error on the text at page 72. It reads: «Being
the line [...] with slope of 45°[...] in the right portion of the figure
[...] the slope is reduced to 22.5°»
The first line has a height of 1 for a base of 1, it's angle is 45º. But
the second line has half the height, i.e. 0.5, which results in a angle
that is not half of the initial one. Instead the angle is approximately
26.6º - computed from atan(0.5/1), or atan2(0.5,1), or similar
depending on your calculator.
(To be pedantic, it probably shouldn't be "slope", as that is the ratio
from height to base - but for a non mathematical text that is a very
very minor issue :-) (See: https://en.wikipedia.org/wiki/Slope)
BTW, the heading at page 74 misses a 's' at "the *s*plit tone plugin"
again,
thank you
I hope darktable is maintained for a long time (I am changing from
another that stopped being updated) as it looks promising just what I
needed.
Ricardo André
(from Portugal)
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