20
1.9 GENERALIMAGINGCONSIDERATIONS
TheHD900Fhasawi
derangeofmenusetti
ngsthatal
l
ow theusertocontrolthel
ookof
thepi
cture.Thesesetti
ngscan beapowerfultoolto changeormodi
fythecaptured
i
mage.Mostcomponentsofthe vi
deo si
gnalcan be mani
pul
ated.Level
s,saturati
on,
gammaandmatri
xwi
l
lhaveamajori
nfl
uenceoverthefi
nalvi
deooutput,bei
tforTVor
fi
l
m.
Whi
l
etherei
snori
ghtorwrongwaytoapproachhow thecamerai
sused,youshoul
dbe
awareoftheconsequencesofempl
oyi
ngcertai
nmenufuncti
ons.Wedonotdetermi
ne
whowi
l
lmakeadjustmentsorwhenthesefuncti
onswi
l
lbeempl
oyed,buti
nmostcases,
theyaremadeatthebehestoftheDP.Whi
l
ethesefeaturesmayproveusefulforshows
thatarevi
deooutonl
y(TV),i
fmi
sused,theycanhavei
rreversi
bl
econsequencesona
fi
l
m-outshow (feature).Judi
ci
oususeofthesefeaturescanprovebenefi
ci
al
.However,
mi
ni
mum mani
pul
ati
onofthei
magethatwi
l
lresul
ti
nacl
eancameramasteri
sdesi
rabl
e.
Iti
sbettertol
eavethedeci
si
ontomani
pul
atethei
mage(toamuchhi
gherdegreethan
thecameraal
l
ows)forthel
essstressfulenvi
ronmentofthepostproducti
onsui
te.The
fol
l
owi
ngl
i
sti
snoti
ncl
usi
veofeverymenufuncti
on,butprovi
desabri
efexpl
anati
onof
whycertai
nprecauti
onsshoul
dbeheeded.
Detail:The detailfunction willprovide artificialenhancementto the video image
particularly around the edge ofan object.Thisfeature,like severalothers,is
i
ncorporatedi
ntothecameraforl
i
veTVbroadcastproducti
ons.Atypi
calusei
stomake
parti
ci
pantsstandoutfrom thebackgroundduri
ngsporti
ngevents.
Whi
l
ethi
si
susefulforTVappl
i
cati
ons,empl
oyi
ngdetai
lforafi
l
m outputproducti
onwi
l
l
putunnaturaledgi
ngaroundthesubject.Inaddi
ti
on,useofdetai
lwi
l
lmakethequal
i
ty
ofCGIormattesverypoorsi
ncethematteprocesstri
estoavoi
d anyappearanceof
edges.
DCC:DCC i
sDynami
cContrastControlorautoknee.Iti
saccessi
bl
ethrough atoggl
e
swi
tchonthecamerabody.Iti
susedduri
ngnewsordocumentarysi
tuati
onswherethere
i
sl
i
ttl
eornocontrolofl
i
ghti
ngandcontrastrati
os.Iftherei
sabri
ghtobjecti
nthescene
thati
sover100% whi
tel
evel
,DCC wi
l
lautomati
cal
l
ypul
lthel
eveldown(compress)so
thehi
ghl
i
ghtwi
l
lnot"bl
ow out".Forascri
pted project,i
tcan beseen thatautomati
c
correcti
on ofhi
ghl
i
ghtscoul
d add undesi
rabl
e el
ementsto the scene asthe camera
movesorpansthroughoutthescene.Whi
l
econtrolofthehi
ghl
i
ghtsi
snecessary,i
ti
s
besttousethemanualkneeandsl
opefuncti
onstoachi
evethedesi
redresul
t.
Bl
ackGamma:Thi
sci
rcui
tal
l
owsforstretchorcompressi
onofthetoe(bl
ack)porti
onof
thevi
deosi
gnal
.Thi
scanbeusedtoaffectthecontrasti
nthedarkareasofthepi
cture
whi
l
enotchangi
ngthemi
d-tonesorhi
ghl
i
ghts.Si
ncethi
sporti
onofthesi
gnalcontai
ns
thehi
ghestamountofgai
n,i
ti
scl
osesttothenoi
sefl
oor.Consequentl
y,expandi
ngthe
si
gnalwi
l
lal
soi
ntroducemorenoi
sei
ntothepi
cture.Thi
smaynotal
waysbeadesi
red
addi
ti
ontothefi
nall
ook.Forafi
l
m outproject,testi
ngi
sprudent.
Matri
x:Thematri
xi
saseri
esofmathemati
calcal
cul
ati
onsthatareappl
i
edtothecol
or
outputofthecamera.Itspurposei
stomatchthecol
orspaceofthecameratothefi
nal
di
spl
ay devi
ce.Iti
ssi
mi
l
arto certai
n equal
i
zati
on curvesthatare empl
oyed i
n the
recording industry to ensure thatthe playback system willreproduce the original
recordi
ngfai
thful
l
y.Inthevi
deoworl
d,matri
xi
susedtoprovi
deasetof equati
onsthat
rel
atetothereproduci
ngcharacteri
sti
csofvari
oussetsofphosphorsthatareusedi
nTV
pi
cturetubes. Thi
sfuncti
on(l
i
keothersonthecamera)hasrootsi
ntheearl
ydaysof
col
ortel
evi
si
onwhentechnol
ogyandeconomi
csdetermi
nedthatsomeci
rcui
tswoul
dbe
pl
acedi
nthecameraandothersi
ntherecei
ver.Aswi
thdetai
l
,matri
xcanproveuseful
forabroadcastorvi
deoonl
yproducti
on.Useofthematri
xfora"fi
l
m out"producti
oni
s
cauti
onedsi
ncethefi
l
m outdevi
cewi
l
lnotbeabl
etorecreatethepropercol
orspace
from thecameratomatchthefi
l
m emul
si
on(theequati
oni
snol
ongerval
i
d).Ifcol
or
mani
pul
ati
on i
sdesi
red,i
ti
srecommended thatoneshootatestusi
ng thematri
xto
createtheappropri
atel
ook.Thi
stestcanbeusedasagui
deforthefaci
l
i
tythatwi
l
lbe
doi
ngthefi
l
m out.
Содержание HD900F
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