Raster Image principles in Adobe Photoshop - Class 3 [Adobe Photoshop for Beginners]:

 Assalam.o.Alaikum

welcome to Tech Learning 4U I am your Zohaib.

So,Lets Start

Photoshop is a creative program.

In Photoshop, we copy, paste, duplicate, erase,

color enhance, and transform.

But what exactly are we copying, pasting,

duplicating, erasing, color enhancing, and transforming?

Well, in this tutorial I want to discuss

the basic principals of how images are represented

and exist in Photoshop.

If you're new to Photoshop,

this will give you a good foundation of knowledge.

This will also help you understand various other factors

as we move on in this course.

So to help demonstrate the following principle,

I'm going to use this image here.

If you wish to follow along, you can find this image

in the introduction folder in the project folder.

Now you can download this project folder for free,

the download link is in the description.

So with the project folder open,

click introduction, Raster Image,

and open the raster image document inside,

and you should have something that looks like this.

So every time you open a photo or raw image

in Photoshop, you are essentially working

with a raster image.

Put simply, a raster image

is made with many little square pixels.

Together, these pixels build up a picture

which we see in Photoshop.

Now if I zoom right in on this image here,

we can begin to see some of the square pixels

that are making up this image.

So we can see here that this image is made of many pixels

with many unique colors.

Photoshop manages these pixels and allows us

to modify and arrange them in ways

which allow us to create work of all kinds.

Now, when working with raster images,

there are a few things you need to keep in mind

such as the limitations of working with raster images.

One limitation is scaling.

Now remember, a raster image is made of a particular number

of square pixels.

If we scale an image down like so,

we will retain visual clarity to a certain degree.

By definition, when you scale a raster image down,

you are simply removing pixels to decrease the dimension

of the overall image.

So this image I started with is now smaller

on the canvas area.

It may not contain as many pixels as it did

a second ago, but we can still see clearly

what the image is.

Now, if we scale this back up and above the threshold

of the original size,

Photoshop will create additional pixels

to accommodate for the new size.

The result of this is that the image quality

has been compromised and appears distorted.

We can see here the image is not quite as clear

or legible as the original.

It's looking pretty blurry around the edges here.

A term often used to describe this is pixelated.

As a rule of thumb, you always want to avoid scaling images

up above the original threshold to avoid your image

becoming pixelated and losing quality.

When using images in Photoshop,

we must always seek the highest quality to work with.

This will ensure quality results.

So that's the basic principle of raster images.

As a beginner, understanding the principles

of the raster image is important

as this well help you understand various other factors

that are important and crucial to know in Photoshop.

As we start to work with images in Photoshop,

it is also very important to understand image size,

dimension, and resolution,

what this means and how this works in Photoshop.

In the next Blog we are going to learn about

image size, dimension, and resolution.

See you in the next Blog.