Spelling Verifier

Skills

• C, pixel manipulation, file I/O, BMP file format, RGB color model

Supported Filters

• Emboss
  • gives image a 3D-like effect by emphasizing the differences between neighboring pixels
  • Using convolution matrix, for each pixel , we multiply the color values (red, green, and blue) of each pixel surrounding it by the corresponding number in the emboss matrix
  • The RGB values of all surrounding pixels are summed up and applied to current pixel
• Edge Detection
  • Sobel operator was used for edge detection
• Grayscale
  • Take the average of RGB values and set all three RGB as the average for each pixel
• Reflection
  • Switch the locations of the left-most pixels and corresponding right-most pixels all the way until reaching center
• Blur
  • Box blur: averaging the color values of neighboring pixels and assign it to each pixel

How this program works

• Load the BMP file: The program reads the image and stores its pixel data in a 2D array.
• Apply the filter: Based on the command-line argument (grayscale, reflection, blur, or edges), the corresponding function is called to modify the pixel data.
• Write the new image: After applying the filter, the modified pixel data is written to a new BMP file.

Usage in terminal

• “make filter”
• Grayscale
  • ./filter -g [input.bmp] [output.bmp]
• Reflection
  • /filter -r [input.bmp] [output.bmp]
• Blur
  • /filter -g [input.bmp] [output.bmp]
• Edge Detection
  • /filter -e [input.bmp] [output.bmp]
• Emboss
  • /filter -m [input.bmp] [output.bmp]