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New IDL Routines

The following new functions and procedures were added to IDL in this release. CDF_EPOCH_COMPARE

The CDF_EPOCH_COMPARE function compares two epoch (date and time) values and returns an integer value of 1, 0, or -1.

CDF_EPOCH_DIFF

The CDF_EPOCH_DIFF function compares two epoch (date and time) values and returns the difference in milliseconds (default) or microseconds.

COLOR_EXCHANGE

The COLOR_EXCHANGE procedure replaces image pixels of a given color with pixels of a new color.

COLOR_RANGE_MAP

The COLOR_RANGE_MAP function maps all the pixels of an image to another set of pixels, using source and target ranges to control the mapping.

COLORIZE_SAMPLE

The COLORIZE_SAMPLE function colorizes a grayscale image by matching luminance levels with an RGB sample table.

COLORMAP_GRADIENT

The COLORMAP_GRADIENT function maps an image into a specified luminance-based gradient.

COLORMAP_ROTATION

The COLORMAP_ROTATION function maps pixels within a given hue range to another hue range, using the HSV hue component.

EDGE_DOG

The EDGE_DOG function applies the Difference of Gaussians filter to a 2D image array.

EMBOSS

Applies an "embossed" convolution operator to a 2D image array.

LAPLACIAN

Applies a Laplacian operator to a 2D image array.

NOISE_HURL

The NOISE_HURL function introduces noise into an image by changing randomly selected pixels to random colors.

NOISE_PICK

The NOISE_PICK function introduces noise into an image by picking randomly selected pixels to be replaced by a neighboring pixel from a random direction.

NOISE_SCATTER

The NOISE_SCATTER function introduces noise into an image by applying normally distributed noise to the entire image.

NOISE_SLUR

The NOISE_SLUR function introduces noise into an image by selecting random pixels to be replaced by a neighboring pixel from a random location in the row above.

OBJ_HASMETHOD

Determines whether an object class implements or inherits a specified method or methods.

PREWITT

The PREWITT function returns an approximation to the Prewitt edge enhancement operator for images.

SHIFT_DIFF

The SHIFT_DIFF function applies a shift-difference filter to a 2D image array.

  IDL Online Help (March 06, 2007)