In today's workshop we were working mainly on our main assessment, so there's nothing really to upload for this workshop. Apart from the assessment we were looking at data types/files formats and experimenting with different forms of compression. In summary, and for my own future reference:

JPEG - Lossy
High compression, wide selection of image qualities, but doesn't maintain transparency.

PNG - Lossless
Lower compression, maintains transparency

TIFF - Lossless
Very low compression, almost no data is lost.

GIF - Lossless
Supports 256 indexed colours, maintains transparency. Can contain multiple images/frames.

PSD - Layered
Contains original layers and effects, can save to any format.

EPS - Lossless, Vector
Used for Vector programs, image can be resized with no loss in quality/pixellation.

(Usual) Image sizes:

PSD > TIFF > EPS > PNG > GIF > JPEG