SEARCH MATHEMATICA 8 DOCUMENTATION

THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.
SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION.

Mathematica > Data Manipulation > Image Processing & Analysis > Color Processing >

Mathematica > Visualization and Graphics > Graphics Options & Styling > Colors > Color Processing >

Mathematica > Visualization and Graphics > Symbolic Graphics Language > Graphics Directives > Colors > Color Processing >

Built-in Mathematica Symbol

ImageLevels

ImageLevels[image]
gives a list of pixel values and counts for each channel in image.

ImageLevels[image, n]
bins pixel values into n equally spaced levels.

ImageLevels[image, n, {min, max}]
puts all values into n bins between min and max.

ImageLevels gives a list of results for each channel. The result for each channel is a list of pairs, each giving the minimum value and count for a particular pixel value bin.

ImageLevels[image, n] by default takes the first bin to start at 0 and the last one to end at 1. Channel values below 0 or above 1 are placed in the first and last bins respectively.

ImageLevels[image, n, {min, max}] takes the first bin to start at min, and the last bin to end at max.

ImageLevels[image, n, All] gives n equally spaced bins, extending over the complete range of values in each channel.

In ImageLevels[image, n, {min, max}], either min or max individually can be All.

Count the number of pixels in each of 10 intensity levels:

Levels of a three-channel image:

Levels for a random image that has intensity values outside the normal range from 0 to 1:

Explicit data range setting:

Count the number of pixels in each of 10 intensity levels:

Levels of a three-channel image:

Levels for a random image that has intensity values outside the normal range from 0 to 1:

Explicit data range setting: