Working out image size ?? ?? (1 Viewer)

[barnsey88]

How do you work out the image size, taking into account pixels etc. Is there like a table you need to know?

thanks

 

[gman03]

How do you work out the image size, taking into account pixels etc. Is there like a table you need to know?

thanks

From memory for IPT they should tell you the bytes per pixel in the scenario and any additional bytes for header etc. You should know the formula rather than a table.

Of course, that's 3 years old information about IPT. I am not aware of any syllabus changes since 2002.

 

[Lwaxana]

The "table" you are thinking of is the relationship between Number of colours or tones and bit depth.

colours = 16 ........ 2^4 = 16 ......... bit depth = 4
colours = 64 ........ 2^6 = 64 ........ bit depth = 6
colours = 256 ...... 2^8 = 256 ...... bit depth = 8

The "formula" is = horizontal pixel x Vertical pixel x bit depth
.....................................................8 x 1024

to give you file size in kb

so graphic with 256 colours (or 8 bits) with resolution of 1024 x 800

file size = 1024 x 800 x 8
........................8 x 1024

file size = 800 kb [remember in exam no calculators allowed]