Take a typical MS Paint drawing by someone with no artistic talent:
The above image is saved as a PNG file. This is because there is a lot of empty space and solid blocks of color, allowing
the compression algorithm to preserve all of the quality whilst making the file only 3.09 KB (3,173 bytes). If however
someone had not read the image format guide and saved this image as a JPEG, this is the resultant mess:
I tried to set the compression level to achieve the same size as the PNG file. The above JPEG is larger than the PNG
at 3.14 KB (3,220 bytes), and looks awful, doesn't it.
However, examples are always the best way of learning things. Below is a whole bunch of images. Decide what format you would use if you were saving the image. Check whether you were right (no checking the filename :)) by hovering your mouse over the image to reveal the format I used.
Well that's about all I can post without going over my bandwidth limits. Hope you got them right, if not go back and read the guide again :).
Revision 1.1, 09/06/2002. © 2002 Richard Stanway. Reproduction of any part
of this guide without my express permission is prohibited.