jefurry / tlibmp

A tiny libary that can read/write/edit .BMP files from disk

tlibmp - tiny libbmp

A tiny libary that can read/write/edit .BMP files from disk

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Basic

It was a lib that can create bmp file, and print in it.

these is some demo with this lib:

Color print

Draw lines

Draw triangles

Image processing

it also contain some basic image processing functions.

I use a picture from pixiv by (ˉ﹃ˉ)EM1234 as following:

I have transform it to a bmp file named test.bmp,

Use this lib, I have made the following images:

Gray

Binary

Channel R

Channel G

Channel B

Mosaic

Histogram graph

Convolution

In mathematics convolution is a mathematical operation on two functions to produce a third function.

As picture can treated as a function, we can run convolution operation on a picture, and this will produce magical effect

Firstly, let's try a Gaussian function, the Matrix(convolution core) is:

	1.0	4.0	7.0	4.0	1.0
	4.0	16.0	26.0	16.6	4.0
	7.0	26.0	41.0	26,0	7.0
	4.0	16.0	26.0	16.6	4.0
	1.0	4.0	7.0	4.0	1.0

and this matrix produce this picture:

and then, let's try a matrix like this:

	-1.0	-1.0	0.0
	-1.0	0.0	1.0
	0.0	1.0	1.0

easily to find that this matrix will produce a gray picture, just like a sculpture:

a matrix like this will stress the edge of the picture:

	0.0	-1.0	0.0
	-1.0	5.0	-1.0
	0.0	-1.0	0.0

To make a color inverse, you can use a matrix with the summary small than zero: