Saving an Image

Question

Hi i have got a problem i'm writting a program that reads in a image, get the image pixels, alter the pixels and then write the image back out again. the problem is that when i write it back out the image goes from colour to gray scale and also when i save the image out without alter the image the image still changes slightly.
to be more precise i save the image as a buffered image, get the pixels , edit the pixels and then save it back. i know that the editing of the pixels is not the problem becasue, when i run the code without editing the pixels and just save the image as a new image. it is still changed.
try {
fos = new FileOutputStream(newFilename+".JPG");
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
try {
ImageIO.write(newImage,"JPG",fos);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}above is the code that i use to save an image.
so if anybody can help me and point me in the right direction that would be great.

Answer 1

well i found out that i was altering the pixels somewhere else which is why i had the problem.
but now that i have fixed that and i want to alter only one pixel then all the pixels arround the one i want to alter will chage to a different colour.
i know this becasue i have created a 5*5 image with all pixels being red then i try to alter the 5th across and 4th down. but the result is that from that point the pixels will also change.
i have tried this saving the image as a JPEG, GIF and as PNG and i get the same result