Unit 30 D2

Impact of formats and techniques on file size and image quality.
File format- This screenshots shows that I have used different file formats for different size of the file and the image quality. Top left picture is the original (244K), to the right the file type is GIF (37.66K), then JPEG (56.84K) and the last picture file format is PNG-24 (114.1K). All file formats have different image quality as they have different file sizes.

Compression techniques- This screenshots shows different compression techniques of one file format. The first one is of course the original. Next to the original the quality is set to maximum, then high and the last one low. Of course maximum quality will have the biggest file size and the best quality of image right after original. Whereas low quality will have the lowest file size and the worst quality of the image.

Colour depth- This screenshots shows different colour depths of the image using GIF format. Like in the screenshots above, the first picture is original which means that nothing is changed. Next to the original GIF has 256 colours which is the highest that can be chosen in photoshop. In bottom left GIF has 128 colours and the last one only 64 colours. It is really hard to see the difference in the screenshot but there is a big difference between all four pictures. All three GIF’s don’t have a big difference in file size whereas image quality difference is pretty big.