Module: HexaPDF::Content::RenderingIntent

Defined in:
lib/hexapdf/content/graphics_state.rb

Overview

Defines all available rendering intents as constants. For use with e.g. Canvas#rendering_intent.

See: PDF2.0 s8.6.5.8

Constant Summary collapse

ABSOLUTE_COLORIMETRIC =

Colors should be represented solely with respect to the light source.

:AbsoluteColorimetric
RELATIVE_COLORIMETRIC =

Colous should be represented with respect to the combination of the light source and the output medium’s white point.

:RelativeColorimetric
SATURATION =

Colors should be represented in a manner that preserves or emphasizes saturation.

:Saturation
PERCEPTUAL =

Colous should be represented in a manner that provides a pleasing perceptual appearance.

:Perceptual

Class Method Summary collapse

Class Method Details

.normalize(intent) ⇒ Object

Returns the argument normalized to a valid rendering intent.

  • If the argument is a valid symbol, it is just returned.

  • Otherwise an error is raised.



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# File 'lib/hexapdf/content/graphics_state.rb', line 285

def self.normalize(intent)
  case intent
  when ABSOLUTE_COLORIMETRIC, RELATIVE_COLORIMETRIC, SATURATION, PERCEPTUAL
    intent
  else
    raise ArgumentError, "Invalid rendering intent: #{intent}"
  end
end