Calculating Image size with RGB/8 bits

1 year 2 months ago #700256 by Rolperezma
I will appreciate it if someone can help me clarify calculating the resulting size of an image...

This is my example:
Original image size 4928 x 3264 Pixels, this will be about 16.08 MB

Now, this is a RGB/8 bits color picture, so you will need 3 bytes (24 bits) for each Pixel to store the color information
16.08 MB pixels x 3Bytes  = 48MB just to store the RGB information for the 3 channels

So, to store this image as a TIFF RGB/8 it would require:
16MB for the location of the original pixel information + 48MB for the RGB information of each of these pixels = 54MB (uncompressed TIFF)

But when I save it, its size only shows 48MB..! what happened to the other 16MB?
What am I doing wrong?

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1 year 2 months ago #700273 by Shadowfixer1
Doesn't really work like you think. The size will change depending upon the amount of detail and color differences in the image. It's not a straight forward mathematical formula as you're thinking.

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1 year 2 months ago #700277 by Nikon Shooter
Correct, there is no formula for relative measures.

In another thread you were asking about crop ratios where there
a formula may be used because it is an absolute ratio — whatever
the end dimensions are.

In terms of file size , it is all relative to bit depth, chrominance, lu-
minance, and details.

Light is free… capturing it is not!
This person is a posting maniac and deserves a #1 badge!Top Poster
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