What kind of images are used in iphone?

i am making a game with a background and ani开发者_Go百科mated helicopter that is flying.When i see other iphone games their backgrounds are so graphically strong ,mine is not near to that .Why is that?

Are there any special type of images used in iphone?

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JPG, PNG, BMP, etc are all capable of being displayed fine on an iPhone.

Keep an eye out for:

• If you are resizing the image (in either direction), it may lose detail.
• If you are not using the full bit-depth - e.g. if you are only using 16 colours.
• If you are highly compressing JPEG images, which is a lossy format.

Of course, if your source image looks bad, it will continue to look bad.