For LCD size 960x240 logo with couple of differen size may be in use
Image for logo
image for logo is just any image saved as JPEG with right size and right name.
For abstract image
Color=YCbCr progressive=off Huffman=yes Quality=90%
Logo Resolutions and size
Compare logos on screen
30x240 vs 960x720
So there is a difference, but logo consume 6 times more space on flash.