Lookup Table (Grayscale»Lookup Table)

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Lookup Table (Grayscale»Lookup Table)

Improves contrast and brightness by applying a lookup table to an image. A lookup table (LUT) contains values used to transform the grayscale values of an image. For each grayscale value in the image, the corresponding new value is obtained from the LUT and assigned to every pixel of that grayscale value.

  • Lookup Table
    Image Source Opens the original input image.
    Equalize Increases the intensity dynamic by distributing a given grayscale interval [min, max] over the full grayscale [0,255]. This function redistributes pixel intensities in order to provide a linear cumulated histogram.
    Reverse Reverses the pixel values, producing a photometric negative of the original image.
    Logarithmic Applies logarithmic transformation on the image pixels, which increases brightness and contrast in dark regions.
    Exponential Applies an exponential transformation on the image pixels, which decreases brightness and increases contrast in bright regions.
    Square Reduces contrast in dark regions. Similar to Exponential but with a more gradual effect.
    Square Root Reduces contrast in bright regions. Similar to Logarithmic but with a more gradual effect.
    Power X Reduces contrast in dark regions.
    Power 1/X Reduces contrast in bright regions.
  • Power Value—Value of the power X for the Power X and Power 1/X functions. Default value is 1.5.

Related Topics

Performing a lookup table transformation