🚀 go-pugleaf

I must say that I'm a 47 year old mother who has recently started
programming just for fun.  I must say that I've watched these newsgroups
for a while, and am amazed at the quality of responses people receive.
Maybe someone can help me now?  Below is a description of how the
program should work and my algorithms for scaling and histogram
enhancement.

I'm working on a program (for fun) that will take a PGM (in ASCII) file
and do some histogram and scaling enhancements.  The interface will be
command line looking something like %PGMenhance -<flag> <pgmfilename>
where the flags are u: prints a short "help" description.
h: applies a histogram enhancement
s: applies a scaling enhancement

Here are a couple things I'm assuming:

-> Input files will be ASCII PGM (P2) format, 256 levels of gray.
-> Input images will not have more than 64,000 pixels of any particular
gray level.

Here's some definitions:

-> Scaling enhancement is performed as follows.  Let MIN and MAX be the
smallest and largest pixel values, respectively.  Modify each pixel, P,
as follows:
    P = (P-MIN)*(256/(MAX-MIN))

-> Histogram enhancement is performed as follows.  Compute the number of
pixels having each gray level from zero to 255.  Let T be the total
number of pixels, and N[I] be the number of pixels at gray level I.
Modify each pixel value P as follows:
    P=P*(1/T)*SUM(N[0],....,N[P])

I'm really lost on how to start a program like this....remember I am a
beginner.  I found this problem while surfing around the net and thought
I'd give it a try.  I'm currently working on the code, and would
appreciate some people's input on how to implement this program and
possibly some code example.

Thanks for your time and patience,

Sandee
-- 
comp.lang.c.moderated - clcm@plethora.net