The American annual of photography . rding to the theoretical diagram) should be shownas a so^id—but it isnt. Instead it is generally representedby but a very light (one-quarter) deposit. This result is duefirst to the amount of red in the ink (which hue is stopped bythe filter) and second to the excessively low luminosity ofthe ink. If the blue printing ink patch were of the proper hue—blue-green, then the large amount of magenta-red, printingover the blue, would not only be allowable, but necessary; fora pure blue could only be produced by the red and blue-green,both printing heavily. This p
The American annual of photography . rding to the theoretical diagram) should be shownas a so^id—but it isnt. Instead it is generally representedby but a very light (one-quarter) deposit. This result is duefirst to the amount of red in the ink (which hue is stopped bythe filter) and second to the excessively low luminosity ofthe ink. If the blue printing ink patch were of the proper hue—blue-green, then the large amount of magenta-red, printingover the blue, would not only be allowable, but necessary; fora pure blue could only be produced by the red and blue-green,both printing heavily. This point shall again be referred topresently. The red patch photographs with practically clear glassbecause these hues are absorbed by the green filter before theyreach the plate in cases where a slight deposit is evident, it isdue to the blue reflected by the magenta and partially trans-mitted by the filter. The yellow patch is represented on the plate by the densestdeposit (exclusive of the white paper) which is, of course, as 276. A HOME PORTRAIT. Jane Reece.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorktennantandw
