They told me, "Aryan, you sexy beast, it's impossible to make cool image effects using just Python!", and I set out to prove them wrong. And I did. Kind of.

Original Image	After Shading

You blend two things in different quantities. Really, it's just that simple. Now what if we interpolated two colors together? That's the question I asked myself while high on caffeine. The program is equally simple:

1. Take an image
2. For every pixel, calculate its greyscale - the average of its R, G and B values (which goes from 0 - 255)
3. Let's make a random color pallete, called the SOURCE_COLORS - [black, white]
4. Based on greyscale, choose a color from SOURCE_COLORS - if greyscale is a small value (0 - 128), choose black, and choose white if it is large (128 - 255)
5. Set this new color as the pixel color

Congratulations, you just made a black-and-white effect!

Original Image	After Black 'N White Shading

But that's just two colors - black and white. What if we added a little grey in between? How could we achieve that?

That's where interpolation is great - it allows us to mix black and white to form [black, GREY, white] after just 1 interpolation. Similarly, this becomes [black, DARK-GREY, grey, LIGHT-GREY, white] after 2 interpolations. I'm sure you can see where this is headed. You can keep interpolating, and the result will consist of multiple shades of SOURCE_COLORS.

Let's try this with a different source colors - [black, purple, yellow, white]:

Original Image	After Shading

Let me remind you - I only changed the source colors, NOTHING ELSE. That's the power of interpolation and shading.

What? You still aren't impressed? I still have one trick up my sleeve.

Interpolation won't just shade everything with a different color - it can COMPLETELY CHANGE the image. Here's what happens with SOURCE_COLORS = [red / orange, white]:

Original Image	After Shading

BAM! How cool is that? Since black and the blue NASA circle are pretty similar in darkness, the interpolation replaced both of them with orange-red, giving us that sexy background look. This result was so surprisingly impressive, that I actually used this as my desktop background XD

Don't worry my child, I have made everything clear in the source code. Read the documentation inside main.py, and you should be ready to go. Yes, it's that simple.

Potential Applications:

• Adding subtle effects to a logo or design
• Making images take a theme color, like with my NASA example
• Getting you laid
• Potentially bypassing copyright infringement, as you can completely change how an image looks, while keeping the content same