Image processing with barehands-ruby

I want to know how to open and manipulate a simple image file in Ruby language.

I don't need to do any advanced stuff, just things like open(), get_pixel() and put_pixel() and I don't wanna use any gem for doing that, but jus开发者_开发百科t to know the barehands-ruby way.

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If by "simple image file" you refer to JPEG, GIF or so, it's tough luck because you'd have to implement all the decoding logic, which is far from being simple (take a look here for more info, but briefly because you really don't want to go into details ;)).

After decoding, eventually what you get is a matrix (two-dimensional array) of pixel information (usually three numbers for red, green and blue component, but other options exist). Then your methods get_pixel and set_pixel are trivial.

What Ruby folks usually do in such cases is wrap already existing C library for image manipulation, into a library such as rmagick.

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Paperclip + ImageMagick did the trick. It's awesome and easy