Create Static Graphics Files (Png, Gif, Jpg) Using Ruby or Python

Create static graphics files (png, gif, jpg) using Ruby or Python

I found Gruff easy to use when I was in your shoes.
Shameless blog plug.

Ruby/Rails image processing libraries

I wrote something like the following:

require 'rubygems'
require 'RMagick'
include Magick

image = Image.new(50, 50) {
  self.background_color = "white"
}
text = Draw.new
text.annotate(image, 0,0,0,40, 'Named Colors') {
     self.fill = 'black'
     self.pointsize = 32
}
image.write("image.png")

Which should be easy enough to follow. Also have a look at the documentation. Whilst it's not quite laid out to perfection, it's pretty much all there.

can a jpeg image be generated programatically?

The program couldn't care less about the file extension. This misconception is sort of the fault of Windows -- file extensions were originally only intended for humans to figure out what a file did. Most file formats have what's called a header section that defines how the document should be read; HTML and XML are both good examples of this. As such, you can't pass just any file with a *.jpg extension and expect it to work.

If you want to manually create a JPEG file, you'll have to read up on the specification and find a library for grails that can write them from raw data. I doubt that this knowledge is critical to your testing, however, and would recommend keeping it simple.

How to embed image or picture in jupyter notebook, either from a local machine or from a web resource?

You mustn't use quotation marks around the name of the image files in markdown!

If you carefully read your error message, you will see the two %22 parts in the link. That is the html encoded quotation mark.

You have to change the line

![title]("img/picture.png")

to

![title](img/picture.png)

UPDATE

It is assumed, that you have the following file structure and that you run the jupyter notebook command in the directory where the file example.ipynb (<-- contains the markdown for the image) is stored:

/
+-- example.ipynb
+-- img
    +-- picture.png

Visualizing x,y,z coordinates in Ruby/Python?

Rather than use Ruby or Python solely for this, I'd recommend taking a look at the "D3.js" library.

You can take advantage of the browser's ability to generate graphics, and the D3 library's multitude of different plots and charts. It's very impressive and should be easy to integrate with Python or Ruby acting as the data generators, feeding the browser via JSON.

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