image processing

Question

I want to change the value of the pixels in an image, for which i need to store the image as a matrix. How can i perform this job? Please guide.

Bozho · Accepted Answer · 2011-03-29 18:39:44Z

6

BufferedImage image = ImageIO.read(..); image.setRGB(x, y, rgb);

Check the documentation of BufferedImage

answered Mar 29, 2011 at 18:39

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Comments

code_fish · Accepted Answer · 2013-09-06 07:41:29Z

Firstly read the image into a BufferedImage.

BufferedImage image = ImageIO.read(new File("..."));

Then create matrix like structure in the 2D array like this and set RGB:

for(int i = 0; i < image.getWidth(); i++){ for(int j = 0; j < image.getHeight(); j++){ image.setRGB(i, j, rgb); } }

ByteHamster · Accepted Answer · 2015-05-09 13:29:47Z

Image is 2d representation of data (pixel info)
2D means x&y directions. In case of image, these directions are generally treated as rows & columns
To change the pixel value, we have to get its location in these rows and columns
Getting pixel location is like that class teacher addressing the unknown student with his sitting position (ex:2nd bench 3rd person)
Like this we have to address the pixel by its rows and column location