Wednesday 29 August 2012

Compression

I made an image of a sunset using the gradient and paint brush tools in Adobe Photoshop CS5.5 and saved it an a JPEG format with 3 different levels of compression.

This is the original image.
This is the lowest level of compression and has the highest quality.

This is a medium level of compression and has medium quality.
This is the highest level of compression and has the lowest quality.

As you can see, as the level of compression is increased, the quality decreases in the image. The most significant change that is noticeable in the change in quality is in fact the line quality of the image. Most of the colours are there, but the lines are reduced in quality and make the quality of the image look bad when it is highly compressed.

I also made an image in black and white on Paint to use for the compression exercise. I have the original image and three levels of compression of that image.
This is the original image.
This the the image with the highest quality and the lowest level of compression.
This is a medium quality, medium level of compression image.
This is the lowest quality image with the highest level of compression.
The line quality in these images slowly decreases as the compression level increases.

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