Best method of reading RGB image data?

Hi all
I scanned the forums for this and am sure you have all been asked it a million times, but I'm a little unclear
What is the best image format to use to read RGB values from image data & eventually save these values for manipulation, hopefully not going into JAI (as never used) if can be helped. I had been advised to use .BMP by my lecturers but as this is not directly supported by Java was wondering what the next best format would be.
At a guess it looks to be .gif but if this is not the case would appreciate any advise

I'd go png: jpeg is losey by default and gif uses a palette:
BufferedImage image = ...
boolean success = ImageIO.write(image, "png", file);
//elsewhere
BufferedImage image = ImageIO.read(file);

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