What determine the memory size of a document or picture? & how comes that ...?

Question

* I know that a page of text has a less memory size than a page of a coloured pgoto !
* But I notice that some text pages have more memory size than a coloured photo pages! HOW THAT COMES!?
** How can two different photos taken by the same camera have different sizes?
PLEASE EXPLAIN WITH DETAILS!!

Answer 1

Pictures can be stored in files that have some unnecessary detail removed (JPEG files with compression). If you take the same photo and store it with less detail it would take up less space. That is usually done with photos that are going to go on web sites since the monitors can't show a lot of detail and small files load more quickly.

Answer 2

First off, are you referring to a pure text file or a picture of page full of text?
If you're referring to pure text, each text is stored as 8 bits (a bit is either 1 or 0, or sometimes referred as on/off or true/false). A colored pixel (a dot on a picture) is usually stored as 32 bits. If you want to represent the character 'a', you would need 8 bits to store it as text, or 640 bits (20 pixels) at minimum to make a distinguishable 'a' as a picture. Just going by this comparison, it is easy to see text is less memory to store than a colored picture. A picture would be only smaller than text if you were comparing a book to a normal picture for example.
Most cameras would store the pictures in JPEG format. JPEG is a method for compressing information (usually an image) into a smaller size. The reasons for doing this is that most human eyes cannot discern certain details about pictures and JPEG will remove those types of details. The exact ways this is done would be too extensive to explain here and may be out of your technical understanding, but if you want to give it a try, you can take a look at http://en.wikipedia.org/wiki/JPEG. But depending on the picture, some may be compressed more than others. For example, if half the picture was a continuous solid color, the picture would be smaller than 'usual'. If there is a wide variety of colors and all kinds of random things on there, the picture may be bigger than 'usual'. If the camera stores photos as uncompressed (like a BMP file), the photo would be always the same size, but a 50 KB JPEG file would become a 800 KB BMP file.

Answer 3

ghaphics take extra area than in many circumstances happening basic textual content fabric, snap shots are create it in pixels so if the snap shots or photos is larger than the different is via the fact the concentration of the digital camera adapt to the size of the item so asign extra pixel. the closer u get to the item it gets greatest