What is the Diffrence between analouge and digital data and define them.
Analogue data is real word input/output meanwhile digital data is in a form in which the computer can understand
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How does a camera capture an image?
it breaks up what the LIGHT SENSOR captures in a grid of pixel, each pixel is then given a value in binary code using a ANALOGUE TO DIGITAL CONVERTER, this value corresponds to a colour
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What is the relation between the number of bits and the file size?
The more bits used the more high quality an image will be, however the higher the file size.
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What is the bitmap resolution?
The number of pixels used to make a bitmap image is defined by the resolution.(WxH)
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Resolution is calculated by doing :
Width x Height
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a typical bitmap is 1000x1000, what is the word to describe this amount of pixels
a Megapixel (1 million pixel)
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How many colours can be represented in one bit?
two, for a binary one and a zero. Then, in two bits 4 ,three bits 8,E.T.C
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What is the bit depth and how is it calculated?
This is the number of colours a pixel can represent in a given number of bits. This can be calculateed with the formula (2 to the power of N) N= number of bits
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what is the bitdepth when there are 256 coulour combinations per pixel?
(2 ^8 = 256) = Bit depth of 8
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How do you calculate file size given the number of megapxels and the bit depth?
multiply the number of pixels by the bit depth in order to achieve
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What is a Vector image?
This is the alternative to a bit mapped image, it is made from a series of lines and basic objects.
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What is the advantages of vector vs bitmapped and bitmapped vs vector?
Vector: can be upscaled without losing quality , file sizes are much smaller as only the calculations needed to create the image is needed.:: Bitmapped: Much more detailed as more pixels can be used to be more accurate
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Advice for me revising in the future:
Make sure you learn the data convetions, such as bits to byte E.T.C
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Other cards in this set
Card 2
Front
it breaks up what the LIGHT SENSOR captures in a grid of pixel, each pixel is then given a value in binary code using a ANALOGUE TO DIGITAL CONVERTER, this value corresponds to a colour
Back
How does a camera capture an image?
Card 3
Front
The more bits used the more high quality an image will be, however the higher the file size.
Back
Card 4
Front
The number of pixels used to make a bitmap image is defined by the resolution.(WxH)
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