Understanding File Formats

The PNG-24 format rendered the best quality images, however (at 129KB and 53KB) the file size is many times larger than the rest of the files. The smallest files are in JPG Low, but the quality of the image suffers. The worst quality images are those in GIF, as pictures with contiguous pixels (such as these) should not be saved in this format; their file size is also high for the bad quality of the picture. The JPG High files deliver a high quality picture and low file size, so this file type seems to be the best balance between the two for these types of images. 

 PNG 24                                

 PNG-8-128-Dithered            

JPG High                              

GIF 128-Dithered                  

GIF-128-No-Dither                

GIF 64-Dithered                    

GIF 64-No-Dither                  

JPG-Medium                          

GIF 32-Dithered                    

JPG-Low                              

GIF 32-No-Dither                  

GIF-Restrictive