Bitmap
name for a family of image file-types composed of dots (pixels). Bitmaps have attributes specifying color format, resolution, header, bit order, and other variables. A checker board is a good conceptual model for a bitmap image.
Blur
To distort the current selection or image by reducing contrast along object lines with gradients.
BPP
Bits Per Pixel. An acronym for the number of bits used to represent the color value of each pixel in a digital image color format. Example: CMYK=32bpp, RGB true color =24bpp,256 color & grayscale=8bpp, 16color=4bpp, Black and White line art=1bpp.
Brightness & contrast balancing
The process of adjusting the density and intensity of an image.