Which image format is lowest in size?

Related questions

1. How do I resize a layer in Photoshop to a specific size?
2. How do I resize an image with a mouse in gimp?
3. How do I scale a path in gimp?
4. What is compression level in gimp?
5. How do I stretch an image in gimp?
6. Does image size affect quality?
7. How do I resize canvas in gimp?
8. How do I resize an image in gimp?
9. How do I resize a layer in Photoshop without losing quality?
10. How do I resize an image in Photoshop to a specific size?

Tags

1. #choice
2. #photos
3. #either
4. #being
5. #normally
6. #clear
7. #indexed
8. #common
9. #image
10. #graphic
11. #photo
12. #quality
13. #smallest
14. #images
15. #important
16. #color