 |
Harvard
University Library Page Images Evaluation Project
home 002024214_0033, color image page W.S. Cowell Ltd., A handbook of printing types, with notes on the style of composition and graphic processes used by Cowells / [Designed and written by John N.C. Lewis] London, Distributed by Faber and Faber [1947] [HOLLIS 002024214] |
Image Quality Evaluations: 2006 study (librarian evaluators) - uncorrected camera TIFF (source for the processed RGB TIFF) (13,234 KB) - processed RGB TIFF (source image for JP2 processing) (12,960 KB) - 600 ppi 1-bit TIFF (from processed RGB TIFF) (372 KB) -- image production notes |
Quality
level |
Setting |
File
size (KB) |
Page
image |
evaluated in 2006 |
0 |
lossless |
7,964 7,884 7,841 |
no no no |
|
1 |
PSNR, 40 dB MSE, slope value 50980 Q = 70 |
2,476 1,948 1,430 |
yes no no |
|
2 |
PSNR, 38.3 dB MSE, slope value 51492 Q = 50 |
2,024 755 780 |
no yes no |
|
3 |
PSNR, 36.7 dB MSE, slope value 51748 Q = 40 |
1,567 478 561 |
no yes no |
|
4 |
PSNR, 35 dB MSE, slope value 51876 Q = 35 |
1,063 455 467 |
yes no no |
|
5 |
PSNR, 32.5 dB MSE, slope value 52004 Q = 30 |
651 371 379 |
no yes no |
|
6 |
PSNR, 30 dB MSE, slope value 52196 Q = 20 |
382 193 217 |
yes no no |