Bitmap Images
What is a Bitmap Image?
Calculating File Size
Metadata
Capturing an Image
Data about data stored within the image file which could include...
The date it was created
The width and height in pixels
The colour depth
The GPS coordinates where the photo was taken
- A light sensory measures the intensity of colour in each pixel
- Each measurement is converted to binary code using an ADC
- The number of pixels in the grid determines the resolution and file size of the image
file size = total number of pixels * colour depth
Take into account that there are 8 bits in a byte when calculating file size
Bitmap images are made up of individual pixels that have a value assigned to them which represents colour depth
Bitmap images used to be known as raster graphics
Colour values are often represented in hexadecimal to be more human-readable
The resolution of the image is represented in the form width x height
DPI (dots per square inch) is the density of pixels in an image
Megapixels (total number of pixels) is width x height x 10^6