DIGITAL IMAGES

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Hey there once again guys! Today I was feeling a bit on the informative, so I decided to enlighten you all with some information about digital images. 

We see digital images all the time. In our phone, in our computer....anywhere. But, even if we do see it on a daily basis, do we really know what it is and how it works?

To start off, we have two types of digital images, vector graphics and raster graphics. Vector graphics use geometrical primitives like lines, shapes or polygons. Made out of mathematical equations that result on an image. The good thing about this type of images sis that it isn't made of pixels, so it cannot loose its quality if you make it bigger or smaller.

Raster images, on the other hand, are made of a grid of pixels or points of color, and they can be stored as different format files. However, unlike vector graphics, its features and quality depend on a series of factors.

For a better understanding of what I am about to tell you, you can take a look to the chart below. And, if you want, you can follow it as I go!



RESOLUTION
First of, we have resolution. It is the amount of detail an images has, the bigger it is, the better. Although this depends on what you mean when you say image resolution, since it is a term that may vary depending the media your refer, like photography or a computer monitor. So, to make it simple, it is the amount of pixels an image has, you can calculate them by multiplying its width by its height.

COLOR DEPTH
In an image, we use bits to represent the color of a single pixel. Also called bpp(bits per pixel), the more color depth it has, the wider the amount of colors it has. 

DATA CCOMPRESSION
An image's size and quality can be manipulated by a process called compression. For example, JPG format allows you to save images with the amount of compression you want. However, there are also file formats that allow the image to be uncompressed, such as TIF or BMP. 

PRINT SIZE
When printing, we should always try and print images that our printer can handle. Here, we use the term dpi or dots per inch. Let's say, for example, that we have an image of 640x480 pixels, and we want to print it with 200 dpi. Then, we divide both width and height by the dpi. Giving us the measurements needed to print an ideal picture. 

FILE SIZE
Files are usually measured in bytes. To get it, you have to multiply the number of pixels of an image by the number of bits it has. 

And we are done! If there is something some one of you guys still don't understand, don't worry! Because this week I will be solving some problems about pixels and dpi for a better view of things. So, stay tuned. 

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