RGB representation of an image

[Marcelo]

Dear all,

It has been at most one hour that I look for a RGB representation of an
image. I have found BufferedImage, but this class doesn't really do what
I need.

I would like to get something like

int [][][] matrixRGB;
matrixRGB = image.getRGB_Representation();

do you have an idea where to get something like that? (a class for
exemple?? )

thanks a lot,

Marcelo

 

[Thomas Fritsch]

It has been at most one hour that I look for a RGB representation of an
image. I have found BufferedImage, but this class doesn't really do what I
need.

I would like to get something like

int [][][] matrixRGB;
matrixRGB = image.getRGB_Representation();

do you have an idea where to get something like that? (a class for
exemple?? )

To get the RGB pixels of a BufferedImage into one or more int arrays you can
use method
public int[] getRGB(int startX, int startY, int w, int h, int[] rgbArray,
int offset, int scansize)
of class BufferedImage. (see the javadoc)
For example, to get all the pixels into one large array:
BufferedImage image = ...;
int w = image.getWidth();
int h = image.getHeight();
int rgbArray[] = new int[w * h];
image.getRGB(0, 0, w, h, rgbArray, 0, w);
If instead you want to get the pixels into several subarrays, you would need
to call image.getRGB(...) several times.

 

[Marcelo]

Thanks a lot,

I have just another remaining question. So, for having a 3D matrix for
the RGB representation, I should call the function several times, but
how is the return type? Do I get first all the R values, then the G
values and at last the B values?

RRRRRRRRRRRGGGGGGGGGGGGGGBBBBBBBBBBB

or is it different ?

thanks a lot,

Marcelo


int r

 

[Thomas Fritsch]

I have just another remaining question. So, for having a 3D matrix for the
RGB representation, I should call the function several times, but how is
the return type? Do I get first all the R values, then the G values and at
last the B values?

RRRRRRRRRRRGGGGGGGGGGGGGGBBBBBBBBBBB

or is it different ?

It is different (something like ARGBARGBARGB...).
When calling BufferedImage.getRGB(..., rgbArray, ...) you get an ARGB value
in each array element of your int[] array. The first int contains the ARGB
value of the first pixel, the second int the ARGB value of the second pixel,
....
Each int contains a packed ARGB value: 8 bits for A (the opacity), 8 bits
for R, 8 bits for G, 8 bits for B.

 

[Roedy Green]

I would like to get something like

int [][][] matrixRGB;
matrixRGB = image.getRGB_Representation();

PixelGrabber is used for extracting rgb bits from rectangles in an
image.

 

[davepooja]

I need to obtain the RGB value of a pixel but i need 3 different values i.e. The R value, G value and B value.....

i tried using BufferedImage.getRGB(int x, int y) but this returns only one value which im confused what value is this... how can the pixel intensity have 1 value ?

Please help..