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File sizes

#1 Toboe Posted 03 July 2006 - 07:04 PM

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I want to know the file sizes from largest to smallest(gigabyte, megabyte, kigabyte, ect.) And also how you hange the size of a picture JPEG file. I also want to know how the file sizes relate to each other, like how 5 pennies relate to a nickel? Thank you for your time.
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#2 SRX660 Posted 03 July 2006 - 07:55 PM

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A short explanation.

Computers operate using the base-2 number system, also known as the binary number system. The word bit is a shortening of the words "Binary digIT." Whereas decimal digits have 10 possible values ranging from 0 to 9, bits have only two possible values: 0 and 1. They are almost always bundled together into 8-bit collections, and these collections are called bytes. Many bytes form Kilobytes, megabytes Gigabytes, Terabytes,and Petabyte. they are:
Kilo = 2^10 = 1,024
Mega = 2^20 = 1,048,576
Giga = 2^30 = 1,073,741,824
Tera = 2^40 = 1,099,511,627,776
Peta = 2^50 = 1,125,899,906,842,624

So a kilobyte is 1024 bytes, Megabyte is 1024 kilobytes, Gigabyte is 1024 Megabytes, Gigabyte is 1024 Megabytes, and so on. Divide each of the above by the number above it to see what i mean.

On jpg pictures most will be in the 25 to 100 megabyte size for use on your computer.These wil average from height/width dimensions of around 200 pixels to 2000 pixels. A simple explanation is a 100 x 100 pixel picture will be sized about 1.38 inches by 1.38 inches. With varibles like the DPI( dots per inch) and JPG compression a 500 x 600( 7 inch by 8.25 inch) pixel picture would be around 50 Megabytes in size.

Theres a lot more to all of this but this is the basics of it.

SRX660
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#3 wannabe1 Posted 03 July 2006 - 08:12 PM

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Hi Toboe...

I'll see if I can clarify this a "bit" for you...though the money analogy won't really work.

The smallest piece of information is a Bit and, in your analogy, would represent a penny.

Next is the Byte which is normally 8 bits in size...or a dime.

Next is the Kilobit (Kilo = 1000) which is 1000 bits...or a dollar (This increment is not really used much).

Next is the Kilobyte which is 1024 bits (and here is where the money analogy goes out the window).

Then Megabyte (Mega = million), which is 1,048,576 bytes or over 8 million bits.

Then Gigabyte (Giga = billion), which is 1,073,741,824 or over 8 billion bits.

Last (at least for this description) is the Terabyte (Tera = trillion), which is 1,099,511,627.776 bytes...over 8 trillion bits.

Hope this helps...

wannabe1

I see SRX660 has already explained this pretty well while I was dilly dallying my reply...I'll leave my reply as additional info only.
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#4 Toboe Posted 04 July 2006 - 11:21 PM

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Thank you so much! You both really helped me alot.
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#5 wannabe1 Posted 05 July 2006 - 12:51 AM

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You are quite welcome.
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#6 SRX660 Posted 05 July 2006 - 03:03 AM

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By the way i made a mistake on the picture sizes. They are in kilobytes NOT megabytes.

SRX660
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