Task 7 [D2]

Compression

JPEG allows you to compress an image file size but when this is done the picture loses its quality and you can see more of the pixels in the image. As you can see from the screenshot the smallest file type has the least quality but it would take the shortest time to load on a web whereas the JPEG with the highest quality takes the longest time to load as it is the biggest files size. Smaller file sizes are used as thumbnails while bigger JPEG are used for things such as posters because the quality on small JPEG files isn’t good enough to be used as a big poster because you would easily be able to see all the pixels. The more you zoom in on a small JPEG file the easier it is to see the pixels but with a high quality larger JPEG file you can zoom in a few times before seeing deterioration of the picture quality. Compressing an image could be useful if you’re uploading a picture to the internet on a slow internet speed so it would load a lot quicker.

Colour Depth

With GIF files you can add and take away the colour depth to a picture. As you can see from the screenshot I have the original picture in the top left and in the top right picture I only have a colour depth of 8 and you can see this clearly because there are a lot less colours that the original image. By changing the colour depth to 8 it has made the file size smaller and used a lot fewer colours in the process to do this. The picture in the bottom right is the picture with the highest colour depth and you can see that it is similar to the original. This is because it uses all the colours in the original image although this makes the file size bigger.

Resolution

Image resolution is the detail that an image can hold and the higher the resolution means the more detail. If I made the image resolution smaller it wouldn't be able to hold as much detail but this means that it would load a lot quicker on a webpage even with a slow internet connection. It would also be a much smaller files size but if I change the resolution to 300 it would allow the image to hold more detail which is more suitable for a print out so it would be a lot clearer.