MBPro problems with image manipulation apps

My MBPro 15" 2011 never gave me any problem and I gotta say I am quite happy with it running any kind of app, recently, very recently, it often hangs up and requires many restarts to log in again, sometimes the grey screen stays still forever, some other times the screen shows stripes along the apple logo but most of all any time I open an image manipulation software it hangs up and fans start spinning a lot, it happens with PhotoShop and iPhoto but not with LightRoom (which is a 64bit app), tried to start a flight sim (the only game I have on the computer which also runs in 64bit) but same effect and it bothers me big time to have to backup it all and reinstall from scratch, any suggestion for problem source to look after?
thank you
Giovanni

Sounds like youre GPU is dead - symptoms match exactly. Check out the thread here - 2011 MacBook Pro and discrete graphics card.
https://discussions.apple.com/thread/4766577?tstart=0

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Problem with Image Manipulation

I am trying to make two methods. One to give me a 2-dim array of Colors from an image so I can access the pixels with x, y coordinates. The other to take an array like that and give me an image. Following is my code:
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.swing.*;
public class ImgManip extends Component
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     public ImgManip() {
          Image image1;
          Image image2;
          Color colors[][];
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          image1 = getImg("city.gif", true);
          System.out.println("city.gif loaded");
          colors = getPixelColors(image1);
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          System.out.println("Pixel Colors made into Image");
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          int h = getHeight(image);
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          int coor[][] = new int[w][h];
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          int ii;
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          } catch (Exception e) {}
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               for(ii = 0; ii < w; ii++)
                    int pai = i * w + ii;
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                    coor[ii] = pixAr[i * w + ii];
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          Color colors[][] = new Color[coor.length][coor[0].length];
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                    colors[i][ii] = new Color(coor[i][ii]);
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          int h = colors[0].length;
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          int i;
          int ii;
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               for(ii = 0; ii < w; ii++) {
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     public static int getHeight(Image image)
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makeImage() gives me the image from the array and getPixelColors gives me the array. It compiles and runs, but the test program won't work. In the constructor for ImgManip, it displays if image1 and image2 are equal. If the methods worked correctly, they would be, but I am getting that they are not. Can someone please tell me what I am doing wrong?

A quick check will compare the properties of the two images such
as width,height and any other simple property that you think is
relevent.
However, the only way to be sure they are the same is to first perform the
quick check above then run through the images and compare the
pixel values of both (effectivly find the difference between the two
images).
public static boolean areEqual(BufferedImage a, BufferedImage b)
// same address so same image
if((a!=null)&&(a==b)) return true;
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// same but cannot tell if they are the same
if(!fastCheck(a,b))
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}else
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      for(int j=0;j<a.getHeight();j++)
        if(a.getRGB(i,j)!=b.getRGB(i,j)) return false;
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}where fastCheck is similar to
protected static boolean fastCheck(BufferedImage a, BufferedImage b)
if(a==null or b==null) return false;
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if(a.getHeight()!=b.getHeight()) return false;
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return true;
}matfud

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Best Regards
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note:
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