Chapter 1. Structure of Digital Photo

Pixel is the smallest unit of the digital photo

Digital Photo Consists Of Many Pixels

Brightness and color data are stored in each pixel

1 PIXEL

color data and brightness data are stored

As I explained, electric devices such as TV, smartphone, PC and multimedia devices emit Red, Green and Blue lights.

But, if you edit brightness and color data. Then you may be feel what ! ?

Inside the digital multimedia device such as smartphone, tablet and etc, brightness and Color data are converted into Red, Green and Blue data. This converted data are then sent to the display unit. It emits Red, Green and Blue lights.

This is a display unit. It emits Red, Green and Blue lights and we can see them

Resolution And Photo Quality

Photo consists of many pixels. Let us consider the photo below.

The number of pixels in the horizontal direction is 16,
The number of pixels in the vertical direction is 9
The number of pixels in this photo is 144 (= 16 * 9 )
The total number of pixels is called resolution. In this case, the resolution is 16 x 9.

Resolution is very important for photo quality.

Let’s compare photo quality of different resolutions.

1. 640 x 360

This is an original image

2. 320 x 180

There is not so much difference from the original image

3. 160 x 90

The photo quality becomes low.

4. 80 x 50

The photo quality becomes pixelated because of poor quality .

5. 16 x 9

Each pixel can be seen. We can not imagine the original image

If there are many pixels we call it with high resolution. This means there are many data so the size of photo becomes big. However, the photo quality becomes better.

Digital Photo Quality Depends On Resolution

N E X T

CONTINUED