Pixels

• A pixel is also known as a picture elements.
• Pixel is the smallest portion of an image or display.
• For better understanding of pixel when zooming into an image.
• Pixel is the basic logical unit in digital graphics.
• Pixels are combined to form a complete image, video, text or any visible thing on computer display.
• More pixels per inch of monitor screen yield better image result.

• The intensity of each pixel is variable. In color imaging systems, a color is typically represented by three or four component intensities such as red, green, blue or cyan, magenta, yellow, and black.

Bits Per Pixels:

• The number of distinct colors that can be represented by a pixel depends on the number of bits per pixel (bpp).
• A 1-bpp image uses 1-bit for each pixel, so each pixel can be either on or off.
• Each additional bit double the number of color available, so a 2 bpp image have 4 colors.
• 1 bpp, 2¹ = 2 colors (monochrome).
• 2 bpp, 2²  = 4 colors .
• 16 bpp, 2¹⁶  = 65536 colors (highcolor).
• 24 bpp, 2²⁴ = 16777216 colors (truecolor).

Pixel Resolution:

• It refers the total number of pixels in an image

Megapixels:

• We can calculate megapixels of camera.

        Width * Height/1 Million

• The size of image can be calculated.

         Size = Pixel resolution * Bits per pixels

        Ex:  Lets say we have an image of dimension: 2500 X 3192.
                Its pixel resolution = 2500 * 3192 = 7982350 pixels.
                Megapixels = 7982350/1 million = 7.9 Mpx = 8 Mpx (approx)

Examples:

My notes images: