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Helmholtz–Kohlrausch effect - Wikipedia The Helmholtz–Kohlrausch effect (named after Hermann von Helmholtz and V A Kohlrausch [1]) is a perceptual phenomenon wherein the intense saturation of spectral hue is perceived as part of the color 's luminance This brightness increase by saturation, which grows stronger as saturation increases, might better be called chromatic luminance, since "white" or achromatic luminance is the
PDF A - Wikipedia PDF A is an ISO -standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents PDF A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption [1] The ISO requirements for PDF A file viewers include color management
PDF UA - Wikipedia PDF UA (PDF Universal Accessibility), [1] formally ISO 14289, is an International Organization for Standardization (ISO) standard for accessible PDF technology
Histogram equalization - Wikipedia Histogram equalization is a method in image processing of contrast adjustment using the image's histogram Histogram equalization is a specific case of the more general class of histogram remapping methods
Gamma correction - Wikipedia Gamma correction or gamma is a nonlinear operation used to encode and decode luminance in video or images [1] Gamma correction is, in the simplest cases, defined by the following power-law expression: where the non-negative real input value is raised to the power and multiplied by the constant A to get the output value
Blend modes - Wikipedia Blend modes (alternatively blending modes[1] or mixing modes[2]) in digital image editing and computer graphics are used to determine how two layers are blended with each other
Brightness temperature - Wikipedia Brightness temperature or radiance temperature is a measure of the intensity of electromagnetic energy coming from a source [1] In particular, it is the temperature at which a black body would have to be in order to duplicate the observed intensity of a grey body object at a frequency [2]
ColorSync - Wikipedia Gray Tone Lightness Decrease Lightness Increase Reduce File Size Sepia Tone User-created filters can have color management, image effects, PDF retouch, domain selection and comments The Color Management section allows assigning a profile, choosing a default profile, rendering intent, converting to a profile or intermediate transform
High dynamic range - Wikipedia High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual
Lightness - Wikipedia The brightness according to CIECAM97s is then: Q = (1 24 c) (J 100) 0 67 (A white + 3) 0 9 The factor 1 24 c is a surround factor that reflects that scenes appear brighter in dark surrounding conditions