Package com.jhlabs.image

Class PixelUtils

java.lang.Object

com.jhlabs.image.PixelUtils

public class PixelUtils
extends java.lang.Object

Some more useful math functions for image processing. These are becoming obsolete as we move to Java2D. Use MiscComposite instead.

Field Summary

Fields

Modifier and Type	Field	Description
static int	ADD
static int	ALPHA
static int	ALPHA_TO_GRAY
static int	AVERAGE
static int	CLEAR
static int	COLOR
static int	DIFFERENCE
static int	DISSOLVE
static int	DST_IN
static int	EXCHANGE
static int	HUE
static int	MAX
static int	MIN
static int	MULTIPLY
static int	NORMAL
static int	OVERLAY
static int	REPLACE
static int	SATURATION
static int	SCREEN
static int	SUBTRACT
static int	VALUE

Constructor Summary

Constructors

Constructor	Description
PixelUtils()

Method Summary

Modifier and Type	Method	Description
static int	brightness(int rgb)	Return the brightness.
static int	clamp(int c)	Clamp a value to the range 0..255.
static int	combinePixels(int rgb1, int rgb2, int op)	Return rgb1 painted onto rgb2.
static int	combinePixels(int rgb1, int rgb2, int op, int extraAlpha)	Return rgb1 painted onto rgb2.
static int	combinePixels(int rgb1, int rgb2, int op, int extraAlpha, int channelMask)	Return rgb1 painted onto rgb2.
static int	interpolate(int v1, int v2, float f)	Interpolate between two values.
static boolean	nearColors(int rgb1, int rgb2, int tolerance)	Return true of the colors are near each other.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

REPLACE

public static final int REPLACE

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Constant Field Values

NORMAL

public static final int NORMAL

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MIN

public static final int MIN

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MAX

public static final int MAX

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Constant Field Values

ADD

public static final int ADD

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SUBTRACT

public static final int SUBTRACT

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DIFFERENCE

public static final int DIFFERENCE

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MULTIPLY

public static final int MULTIPLY

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HUE

public static final int HUE

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SATURATION

public static final int SATURATION

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VALUE

public static final int VALUE

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COLOR

public static final int COLOR

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Constant Field Values

SCREEN

public static final int SCREEN

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Constant Field Values

AVERAGE

public static final int AVERAGE

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OVERLAY

public static final int OVERLAY

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CLEAR

public static final int CLEAR

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EXCHANGE

public static final int EXCHANGE

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DISSOLVE

public static final int DISSOLVE

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Constant Field Values

DST_IN

public static final int DST_IN

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Constant Field Values

ALPHA

public static final int ALPHA

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Constant Field Values

ALPHA_TO_GRAY

public static final int ALPHA_TO_GRAY

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Constant Field Values

Constructor Detail

PixelUtils

public PixelUtils()

Method Detail

clamp

public static int clamp(int c)

Clamp a value to the range 0..255.

Parameters:

c - The value to be clamped

Returns:

the clamped value.

interpolate

public static int interpolate(int v1,
                              int v2,
                              float f)

Interpolate between two values.

Parameters:

v1 - The first value

v2 - The second value

f - The amount of interpolation, typically between 0 and 1.

Returns:

the interpolated value, clamped to 0..255.

brightness

public static int brightness(int rgb)

Return the brightness.

Parameters:

rgb - RFB encoded.

Returns:

The average of the R, G and B.

nearColors

public static boolean nearColors(int rgb1,
                                 int rgb2,
                                 int tolerance)

Return true of the colors are near each other.

Parameters:

rgb1 - The first color

rgb2 - The second color

tolerance - The maximum difference for r, g, and b between the two values.

Returns:

True if the colors are near each other.

combinePixels

public static int combinePixels(int rgb1,
                                int rgb2,
                                int op)

Return rgb1 painted onto rgb2.

Parameters:

rgb1 - The first pixel.

rgb2 - The second pixel.

op - The operation as defined by this class.

Returns:

the combined pixel.

combinePixels

public static int combinePixels(int rgb1,
                                int rgb2,
                                int op,
                                int extraAlpha,
                                int channelMask)

Return rgb1 painted onto rgb2.

Parameters:

rgb1 - The first pixel.

rgb2 - The second pixel.

op - The operation as defined by this class.

extraAlpha - The extra alpha.

channelMask - The channel mask.

Returns:

the combined pixel.

combinePixels

public static int combinePixels(int rgb1,
                                int rgb2,
                                int op,
                                int extraAlpha)

Return rgb1 painted onto rgb2.

Parameters:

rgb1 - The first pixel.

rgb2 - The second pixel.

op - The operation as defined by this class.

extraAlpha - The extra alpha.

Returns:

the combined pixel.