LAB.md

Bitmap Transformer

Description

For this assignment you will be building a bitmap transformer class.

The wikipedia article found here Bitmap Specification describes the byte specification of a "windows bitmap file.":

• We'll be working the simplest version, meaning no compression
• The sample files fit "perfectly" in terms of byte size per row

The core functionality is to pass a buffer to the bitmap transformer, and then apply one or more color transforms to the image.

This will require the use of node Buffer in order to manipulate binary data.

This lab is more structured and there are tests to guide you:

1. Start with the tests in bitmap-header.test.js. This will require you to find the location of the needed data using the wikipedia article.
   1. The first test requires that you have the right constants defined
   2. The second test requires that you create a BitmapHeader class that finds the information in the bitmap header and structures it as properties of the bitmapHeader instance.
2. Create two transformation functions, following the tests in transformers.test.js
3. The final test in bitmap-transformer.test.js requires you to integrate header and transformations using a BitmapHeader class. The test is a pinning, or snapshot test, and a pre-converted standard is provided

Rubric:

• Bitmap Header Tests Pass 2pts
• Transform Tests Pass 2pts
• Bitmap Transformer Tests Pass 3pts
• Clean Code 3pts

Transformations

Interested in more transforms?

• https://www.johndcook.com/blog/2009/08/24/algorithms-convert-color-grayscale/