Lossy compression is when an image file gets rid of some of the information it deems unnecessary when saved, this makes the size of the image file smaller. This is only useful if you are only saving the file once and not using it again because each time it is resaved it loses more information.
Lossless compression is where the image file stores all of the original information on it, this means that the image quality is high but the file size is large. This allows you to open and reopen the file without it losing quality.
JPG is used for images of high quality but small file sizes. It is the most common type of image file around. It is a raster file type so it has high quality. The pros of this file type are that it delivers has resolution images and small file types which makes them good for photos. JPG's use lossy compression so they aren't good for saving and resaving a lot.
GIF is also used for images and it is a raster file type. This has high resolution and large file sizes. The pros are that it has very high image quality. The cons are the large file sizes and it only uses 256 colours. GIF uses lossy compression. It can also use transparency and animation.
PNG is a raster file type, they are lossless and keep their image quality and they have large file sizes. They are good for photos. PNG also uses transparency.
PSD is used when saving images in Photoshop, these are high quality images but are extremely large file sizes. They are useful as Photoshop is industry standard and is commonly used so most people can use them. These are raster file types. It uses lossless compression. Photoshop files also save layers.
TIF is similar to PSD but the older version it is pretty much worse in every way, lower quality images and larger file sizes. It is a raster file type. It also uses lossless compression.
BMP is a raster file type. They don’t use any type of compression so they have large file sizes. Only used by Microsoft.
AI is a vector image type. This is mainly used by Adobe Illustrator. Which uses lossless compression. This type of image can be magnified thousands of times and never pixelate. They usually have average sized file types.
EPS image file types use lossless compression and is a vector file type.
AI is a vector image type. This is mainly used by Adobe Illustrator. Which uses lossless compression. This type of image can be magnified thousands of times and never pixelate. They usually have average sized file types.
EPS image file types use lossless compression and is a vector file type.
No comments:
Post a Comment