Update README.md

Author: arasgungore

README.md

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 # image-manipulation-and-fractals
-<p align="center"><img src=https://github.com/arasgungore/image-manipulation-and-fractals/blob/master/jpg/all_in_1.jpg></p>
+<p align="center"><img src="https://github.com/arasgungore/image-manipulation-and-fractals/blob/master/jpg/all_in_1.jpg" width="400" ></p>
 
 A C project for processing PPM images (grayscale, rotate, resize, blur, contrast, etc.) and generating popular fractals such as Mandelbrot set, Julia set, Koch curve, Sierpinski triangle, etc.