IMAGE REPRESENTATION
WHAT IS IMAGE MADE OF? WHAT IS RESOLUTION? HOW IS IMAGE STORED?
It depends to the type of image. There are two types of It is the amount of pixels for each row and line have. This
Bitmap: Every pixel are stored by
image, one is bitmap, which is made by pixels of different color, only appear in bitmaps, because vector diagram don’t have
bits. But if it includes different
and another one is vector graph, which have different shapes pixels. For example, 4096*2048 is a kind of resolution. The
colors, you can use the color depth (in
combined together to get a image. Every image have color more higher the resolution is, the more clearer the image is.
bits) * resolution to calculate the
depth, and it will be explained afterwards.
total size of the image.
Vector graph: They are stored by
WHAT IS PIXEL? WHAT IS COLOR DEPTH? attributes. The computer use the
It is basically how many colors a pixel or shape can represent, attributes to calculate the shape and
Pixels are little squares that can have different colors. It is and it is measured in bits. For example, if one image have only color of the images.
the basic element that made up every bitmap images. When white and black colors, its color depth is one bit. Because a bit
you zoom in to the bitmad diagrams, you can see that there can represent one true/false, so one bit can represent two
are little squares, these are pixels. Also, pixels only appear in colors. The most popular color system is “RGB”, which use
bitmap diagrams. three bytes (8-bit) to represent the color of red, green and
blue.
Bitmap image: One part enlarged:
ISAAC ZHUANG 2025/3/21
You can see those little pixels
