Wednesday, December 12, 2012

Two qualities of light

Light,  with  reference  to  the  tone  it  induces  on  objects,  is either  to  be  considered  as  neutral  and  white, bringing out local colours with fidelity; or coloured, and consequently modifying these local tints with  its own. But the power of pure white light to exhibit local  colour  is  strangely  variable.  The  morning  light  of  about nine or ten is usually very pure; but the difference of its effect on different   days,   independently   of   mere   brilliancy,   is   as inconceivable    as    inexplicable.    Every    one    knows    how capriciously the colours of a fine opal vary from day to day, and how  rare  the  lights  are  which  bring  them  fully  out.  Now  the expression of the strange, penetrating, deep, neutral light, which, while it alters no colour, brings every colour up to the highest possible pitch and key of pure harmonious intensity, is the chief attribute  of  finely  toned  pictures  by  the  great  colourists,  as opposed  to  pictures  of  equally  high  tone,  by  masters  who, careless of colour, are content, like Cuyp, to lose local tints in the golden blaze of absorbing light.
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 the positive hue, namely, which it may itself possess, of course  modifying  whatever  local  tints  it  exhibits,  and  thereby rendering   certain   colours   necessary,   and   certain   colours impossible. Under the direct yellow light of a descending sun, for  instance,  pure  white  and  pure  blue  are  both  impossible; because the purest whites and blues that nature could produce would  be  turned  in  some  degree  into  gold  or  green  by  it.

MP I, p. 270

"There  are  two  qualities  of  light  most  carefully  to  be  distinguished  in speaking of the tone of a picture. 1st. Its own actual colour, which falls more or less  on  everything  which  it  touchesŕneutralizing  the  colours  existing  in  the objects themselves. Such is the well-known pure rose-colour which the rays of the  sun  assume  five  minutes  before  sunset.  This  colour  is  scarcely  ever  seen except on mountains and clouds, for the sun is too low before the tint is taken to permit its falling clear upon objects on a level with it, but sometimes, with a sea horizon, and a perfectly clear sky, it may be seen low. I adduce it as the most  positive  and  overpowering  tint  of  light  I  know,  for  no  colour  stands  before green or blue or whatever it may be, all are turned nearly pure rose by it. It is of course seen in its greatest purity on the Alps, but often occurs very pure on the highest clouds, not the cumuli, but the streaky uppermost bars at sunset. I have   seen   it   once   at   Venice,   of   extraordinary   intensit, so   totally overwhelming  every  local  tint  within  its  reach,  as  to  admit  of  nothing  like  a guess at their actual colour, the rose appearing inherent and positive in them. The  trees  in  the  Botanic  Gardens,  especially,  which  were  of  a  pure  pale green (it was May) became not merely russet but pure red."

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