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how to convert an image type of object in java a buffered image

Posted on 2004-04-10
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hi,

i am trying to read a bmp file and convert it to three dimensional array of brightness, i have got it converted to image, now how can i convert it to bufferedimage object in java????

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Question by:kashish_18_2003
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by:GrandSchtroumpf
ID: 10797422
> three dimensional array of brightness
do you mean the RGB values?

> now how can i convert it to bufferedimage object in java?
you have 2 solutions here
1) you read your image file straigth to a BufferedImage using ImageIO static read method.
2) you create your BufferedImage, use the getGraphics() method to get it's graphics object and paint you Image on the graphics object.

solution 1 is much easier.
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by:kashish_18_2003
ID: 10797857
sorry, 2d array of brightness... not rgb values,

i want a .bmp file to be read but io allows only jpeg, gif and png files, i have read it to a image file format now for rgb val i can use pixel grabber but what abt brightness, i want brightness vals.
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GrandSchtroumpf earned 60 total points
ID: 10801004
You can calculate the brightness from the RBG values.
This formula seems to be often used:
30% red + 59% green + 11% blue
But the result is debatable:  http://www.compuphase.com/cmetric.htm

For your BufferedImage, your can use the second solution i suggested:

    int imageType = BufferedImage.TYPE_BYTE_INDEXED;
    BufferedImage newImage = new BufferedImage(yourImageWidth, yourImageHeight, imageType);
    java.awt.Graphics2D destG = newImage.createGraphics();
    destG.drawImage(yourImage, 0, 0, null);
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by:GrandSchtroumpf
ID: 10980894
:°)
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