Ashish Sethi wrote:

IF there is a file in ppm format like

P3
3 3
15
0 0 0   10 10 10  2 2 2
1 1 1   12 12 12  4 4 4
4 4 4   11 11 11  9 9 9

Then isnt this file in RGB 4:4:4 color space as the maximum value that
any of the color components can take is 15 (binary 4 bit)

Given that it uses 2-3 bytes per component (16-24 bits), I wouldn't call it a 4-bit image. PPM text files may have a maximum value, but they don't have a bit size. The data in the file will fit in a 4-bit file, though.

What my job is to read a ppm(p3) file in RGB 8:8:8 color space where
values are in 0-255 range and change these values to 0-16 range as i
explained earlier.
This much i have acheived...now i need to create another ppm(p3) image
using thes new values (a list 3 member tuples).
Now please explain if their is something wrong in my understanding and
if not please help me in creating the new ppm file

I posted code for writing PPM text files earlier.

</F>

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