Image 3 - A2

The third image which I worked on was of a patch of grass. It started at 470 KB in size.

First I shall be dealing with the GIF format. When changing to this format in Photoshop, the image is given a certain amount of colours depending on the quality required of the image. The range of colours goes from 2 to 256. I created multiple copies of the image with varying amounts of colours to investigate how the amount changes the quality and file size.

As can be seen from the graph, the increase in colours creates a steady increase in file size. However, viewing the images themselves is a different story. Many of the smaller sized images are not suitable for use on the web, as they are of very poor quality.

 


The image on the left is of a very poor quality and would not be suitable for use on the internet

It is also possible to keep a similar quality while dropping the file size even further using Dithering. this scatters the pixels around the borders of the colours to try and create a new colour. This improves the quality by making the colours blend smoothly. Dithering prevents the images from becoming too distorted while keeping the file size low.

                       

When creating JPEG images in photoshop, the main thing which is affected is the quality. To reduce the file size, the quality must be changed from 100% downwards. Initially, there is very change within the image while the file size drops drastically. This is useful for using images on the internet.

Reducing the image quality below 60% greatly reduces the file size with little change to visual quality.