Larger image dimensions don't always mean larger file sizes. It's the combination of the depth of colour, the resolution and the dimensions that makes something big or small disk space wise. Normally you can choose to work with colour swatches like these...
...which are a small selection of basic colours...
...web colours like these...
...which are the full colour spectrum
simplified a bit.
The greater the depth of the colours that you use, the larger your finished file will be.
So a picture created using colour swatches will be smaller than this...
...which is smaller than this.
The dimensions and the resolution are exactly the same, but the first picture's 586kb in size, the second's 594, and the third's 631. For the record, it really is quite difficult to sing the rainbow song backwards, the tune doesn't go at all.
The higher the resolution of an image is, the more pixels there are making it up. A lot of mobile phone cameras still produce low resolution images, which is why when you try to view them on a computer the picture's often small, and pixellates when you blow it up.
Sound!
The audio sampling rate is the number of samples per second that are used to digitise a particular sound. Most digital video cameras can record at a number of different audio sampling rates, with the highest rates producing the best results (and the biggest files).
Bit rate can describe the quality of an audio or video file. An MP3 compressed at 192kbps will have a better range and sound clearer than the same track compressed to 128kbps. This is because more bits are used to represent the data during each second of playback. Just like the quality of an image is measured in resolution, the quality of an audio track is measured by bit rate.
Video!
As with images, the larger the dimensions of a film's frames, the more disk space it will occupy. And the same as audio, the higher the frame rate you run the film at, the smoother the film will run. When you run a film at 24 frames per second, the actions are smooth and reflect real life. When you run it at 10fps, the movements are jerky and you can see when the frames change and it doesn't look realistic. This is especially noticeable when you're animating - the ideal is at least 24 individual images for every second of video you want to produce.
And obviously the bigger the files you need to transfer, the longer it'll take...the little green men in your computer have to shout out more ones and zeros per file, and they get a bit hoarse, bless them.
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