http://www.perlmonks.org?node_id=998273

Hopfi has asked for the wisdom of the Perl Monks concerning the following question:

Hi PerlMonks! I was wondering if there is a way in perl to make a list which counts each occurence of a value. I want to use it to make a picture encrypter. So it should make a color occurence list like this: 
ID  Occurence
255 625
212 365
220 186
219 135
169 132
227 116
213 115
234 21
205 18
184 15

[download]
Any idea how this could be done? Cheers

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