poor image scaling for 1-bit images

[mangtronix]

In this spread, the right hand page seems to scale poorly, whereas the left one is better. Zoom to 25% and compare: http://www.archive.org/stream/zc-f-c-b-4/zc-fred-test#page/n1/mode/2up

[mangtronix (mang)]

Here's another example: http://www.archive.org/stream/NasaTechDocTest/InterplanetaryRadioCommunicationWithExtraterrestrialCivilizations

[mangtronix (mang)]

Hank writes:

Here's one that's mostly 1-bit jp2s:

http://www.archive.org/stream/legislativedocu69assegoog

The derive log at http://www.us.archive.org/log_show.php?task_id=41542509 shows which images have what depth. Search down to the ProcessJP2 module, and you'll see an image-by-image breakdown. "1" means 1-bit, "8" means 8-bit grayscale, and "c" means 24-bit color.

[mangtronix (mang)]

Here's a good summary of the bit depths possible (doesn't have jpeg2000):
http://www.scantips.com/basics09.html

[mangtronix (mang)]

Better table including jpeg2000, from Cornell Library:
http://www.library.cornell.edu/preservation/tutorial/presentation/table7-1.html

[mangtronix (mang)]

For jp2s we may also want to look at the ColorSpace tag, since we could have an 8-bit grayscale.

mang@home:~/public_html/imageconvert/1bit/InterplanetaryRadioCommunicationWithExtraterrestrialCivilizations_jp2
$ /petabox/sw/books/exiftool/exiftool InterplanetaryRadioCommunicationWithExtraterrestrialCivilizations_0000.jp2
ExifTool Version Number : 6.93
File Name : InterplanetaryRadioCommunicationWithExtraterrestrialCivilizations_0000.jp2
Directory : .
File Size : 37 kB
File Modification Date/Time : 2009:12:09 15:54:46
File Type : JP2
MIME Type : image/jpeg2000
Image Height : 3301
Image Width : 2542
Number Of Components : 1
Bits Per Component : 1 Bits, Unsigned
Compression : JPEG 2000
Colorspace : Grayscale
Image Size : 2542x3301

[mangtronix (mang)]

TIFF does it differently.

$ exiftool nybc200109_0543.tif
ExifTool Version Number : 6.93
File Name : nybc200109_0543.tif
Directory : .
File Size : 193 kB
File Modification Date/Time : 2009:01:09 05:24:44
File Type : TIFF
MIME Type : image/tiff
Image Width : 5081
Image Height : 6592
Bits Per Sample : 1
Compression : T6/Group 4 Fax
Photometric Interpretation : WhiteIsZero
Fill Order : Normal
Document Name : Standard Input
Image Description : converted PNM file
Strip Offsets : (Binary data 3550 bytes, use -b option to extract)
Orientation : Horizontal (normal)
Samples Per Pixel : 1
Rows Per Strip : 12
Strip Byte Counts : (Binary data 1985 bytes, use -b option to extract)
X Resolution : 600
Y Resolution : 600
Planar Configuration : Chunky
Resolution Unit : inches
Image Size : 5081x6592

[mangtronix (mang)]

PNG

$ exiftool BozorSobirkhonavodaParokandaShud.png
ExifTool Version Number : 6.93
File Name : BozorSobirkhonavodaParokandaShud.png
Directory : .
File Size : 72 kB
File Modification Date/Time : 2009:11:26 14:50:56
File Type : PNG
MIME Type : image/png
Image Width : 162
Image Height : 215
Bit Depth : 8
Color Type : RGB
Compression : Deflate/Inflate
Filter : Adaptive
Interlace : Noninterlaced
Gamma : 2.2
Software : Adobe ImageReady
Image Size : 162x215

[mangtronix (mang)]

exiftool not reporting bit depth for this gif. identify reports "4c" whereas usual is "256c". Previously determined that "identify" is very slow for jp2.

$ exiftool Pullimosina_pullula_wing-bw-1Bit.gif
ExifTool Version Number : 6.93
File Name : Pullimosina_pullula_wing-bw-1Bit.gif
Directory : .
File Size : 29 kB
File Modification Date/Time : 2010:01:21 23:33:03
File Type : GIF
MIME Type : image/gif
Image Width : 1044
Image Height : 488
Comment : Created with The GIMP
Image Size : 1044x488

mang@home:~/public_html/imageconvert/bitdepth
$ identify Pullimosina_pullula_wing-bw-1Bit.gif
Pullimosina_pullula_wing-bw-1Bit.gif GIF 1044x488 1044x488+0+0 PseudoClass 4c 29kb

[mangtronix (mang)]

Example 1-bit books to test:

http://www-testflip.archive.org/stream/zc-f-c-b-4/zc-fred-test#page/n1/mode/2up
http://www-testflip.archive.org/stream/legislativedocu69assegoog

Yiddish Book Center 1-bit tiffs:
http://www-testflip.archive.org/details/nationalyiddishbookcenter

1-bit books should look reasonable at all zoom levels. Random sampling of other books on www-testflip.archive.org should show no change!

[raj (raj-archive)]

The three testflip books above work well on OSX 10.6.2/Safari 4.0.3

[raj (raj-archive)]

Also works well on osx 10.6.2/Firefox 3.5.8

[mangtronix (mang)]

Working on IE8/XP.

[mangtronix (mang)]

Regression tests pass on IE.