Image resolution 300ppi upscaled

hello photoshopers.
I have an image which is 4cm x 4cm (1200pixels by 1200pixels) 300ppi and i have placed it into an A3 size document.
Because the image is 300ppi does that mean its tolerantt to be upscaled without image pixelating?The fact that an image consists of 300di
does that automaticly mean it can be upscaled into any sized document,or does the image also have to have pixels sufficient enough to be upscaled.
thank you.

inquestflash wrote:
... Because the image is 300ppi does that mean its tolerantt to be upscaled without image pixelating?The fact that an image consists of 300di
does that automaticly mean it can be upscaled into any sized document ...
No, the number of pixels per inch is unrelated to "tolerance to upscaling".
When  scaling an image, a resampling algorithm will create each new pixel from a group of original pixels with no knowledge of the relationship of the pixels to an inch (or cm, etc.)

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