Ori.png 81k
1b 4k
8bDeflate 24k
8blzw 42k
24bDeflate 46k
24blzw 69k
capture(640x480)
Ori.jpg 47k
40Compress 13k
1b 3k
8b 175k
24b 226k
scan image(2448x3264)
Ori.jpg 1.9M
1b 38K (1.9%)
8b 4.2M
24b 5.8M
Conclusion:
* If don't care quality, jpeg compression save more space.
* bilevel image can shrink less than 10% compress rate than jpeg image.
* 24b won't be 3 tims of 8b, tiff should use some compressing algorithem on saving data.