alpha version

Implemented filters:

• Negative
• Logarithmic
• Gamma Correction
• Histogram Equalization
• Median
• Piecewise Linear
• Arithmetic Mean
• Geometric Mean
• Harmonic Mean
• Contra-harmonic Mean
• Convolution
• Laplacian
• Sobel

Implemented filter for frequency domain:

• Fourier transform spectrum
• Low-pass
• High-pass
• Band-pass

Scale transformations:

• Scale using nearest neighbour
• Scale using bilinear
• Rotation using nearest neighbour
• Rotation using bilinear

Color filters:

• Sepia
• Chroma-Key
• Adjust Hue
• Adjust Saturation
• Adjust Brightness

Color conversion:

• RGB to gray via weighted average
• RGB to gray via simple average
• RGB <-> HSV
• RGB <-> HSI

Other:

• Steganography (write and read a message)
• Draw histogram of any image (gray or RGB)