Class Brightness
java.lang.Object
net.sourceforge.jiu.ops.Operation
net.sourceforge.jiu.ops.ImageToImageOperation
net.sourceforge.jiu.ops.LookupTableOperation
net.sourceforge.jiu.color.adjustment.Brightness
Adjusts the brightness of an image.
The brightness change is specified as a percentage value between -100 and 100. -100 will make the resulting image black, 0 will leave it unchanged, 100 will make it white.
Supported image types
Usage examples
Both examples make the input image 30 percent brighter.If all you want is to create a new image with adjusted brightness from the image data of an existing image, simply use the static helper method:
PixelImage adjustedImage = Brightness.adjust(inputImage, 30);This leaves the original image inputImage unchanged and allocates a second image object which is here assigned to the variable adjustedImage.
If you want more control over parameters, create your own Brightness object. You can then reuse image objects, e.g. to write the adjusted image data to the original image object:
Brightness brightness = new Brightness(); brightness.setInputImage(image); brightness.setOutputImage(image); brightness.setBrightness(30); brightness.process(); // at this point, image will contain the adjusted image data, // the original data wil be overwritten
- Author:
- Marco Schmidt
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Field Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic PixelImage
adjust
(PixelImage input, int percentage) This static helper method is more simple to use when all you need are the standard options.private int[]
createLookupTable
(int numSamples, int brightness) Creates a lookup table that holds all new values for samples 0 to numSamples - 1.void
process()
This method does the actual work of the operation.private void
process
(Paletted8Image in, Paletted8Image out) void
setBrightness
(int newBrightness) Sets the brightness adjustment value in percent (between -100 and 100).Methods inherited from class net.sourceforge.jiu.ops.LookupTableOperation
getNumTables, getTable, prepareImages, setNumTables, setTable, setTables
Methods inherited from class net.sourceforge.jiu.ops.ImageToImageOperation
canInputAndOutputBeEqual, ensureImagesHaveSameResolution, ensureInputImageIsAvailable, ensureOutputImageResolution, getInputImage, getOutputImage, setCanInputAndOutputBeEqual, setInputImage, setOutputImage
Methods inherited from class net.sourceforge.jiu.ops.Operation
addProgressListener, addProgressListeners, getAbort, removeProgressListener, setAbort, setProgress, setProgress
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Field Details
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brightness
private int brightness
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Constructor Details
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Brightness
public Brightness()
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Method Details
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adjust
This static helper method is more simple to use when all you need are the standard options.- Parameters:
input
- the image to work onpercentage
- brightness modification, from -100 to 100- Returns:
- a new image with adjusted brightness
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createLookupTable
private int[] createLookupTable(int numSamples, int brightness) Creates a lookup table that holds all new values for samples 0 to numSamples - 1. -
process
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process
Description copied from class:Operation
This method does the actual work of the operation. It must be called after all parameters have been given to the operation object.- Overrides:
process
in classLookupTableOperation
- Throws:
MissingParameterException
- if any mandatory parameter was not given to the operationWrongParameterException
- if at least one of the input parameters was not initialized appropriately (values out of the valid interval, etc.)
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setBrightness
public void setBrightness(int newBrightness) Sets the brightness adjustment value in percent (between -100 and 100).- Parameters:
newBrightness
- the amount of change to be applied to the brightness of the input image- Throws:
IllegalArgumentException
- if the argument is smaller than -100 or larger than 100
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