the ultimate tool for PNG compression optimisation

[Jaff]

Here are some difference form above posted "Ultimate tool for PNG compression optimisation" versions of tools used in it and current (23.01.2009) from official webpages. Most of links are related to ftp.mirrorservice.org or official sites.

PNGout
used - (09.02.2008)
latest - (20.11.2008) - DDL

OptiPNG
- used v0.55 (29.01.2007)
- latest 0.6.2 (11.11.2008) - DDL

PNG crush
- used v1.6.4 (21.11.2007)
- latest available for download v1.6.10 Win (28.09.2008) - DDL
- latest v1.6.3.13 (07.01.2009) (no binary available at this moment)

PNG Rewrite
- used v1.2.1 (??.??.???)
- latest v1.3.0 (17.12.2008) - DDL

advPNG
- latest/used v1.15 (DOS-Pentium) (01.11.2005) - DDL

deflopt
- latest/used v2.07 (05.09.2007) - DDL

PNG check (3 files) - DDL
* pngcheck.exe
- latest/used v2.3.0 (07.07.2007) compiled with zLib 1.2.3
* png-fix-IDAT-windowsize.exe
- latest/used v0.5 (01.08.2005)
* pngsplit.exe
- latest/used v0.6 beta (11.02.2007)

External programs:
ImageMagick
- latest version v6.4.8-8 (22.01.2009) - DDL HTTP / FTP


Download "Ultimate tool for PNG compression optimisation" updated 23.01.2009:
attachment / MIDI MANiACS @Xhost

* Note: pngopti.cmd changes:
- path for ImageMagick has been changed to C:\Program Files\ImageMagick\ (default install folder of program)
- various version tools have been updated

[Sam_Zen]

I would add : why is any maximum so important nowadays ?
Concerning filesize : besides quick loading of a web-page, also with image attachments to a mail.
Due to intermediate en- and de-coding is the file growing to 150 %.

Bhikkhu talks about reducing to 256 colours, and he's right. With some scans of 'graphic' design it's possible to go down to 16 colours, or even 4. PNG can handle that.

[Jaff]

Not only reduction to 256 colors is best also converting to grayscale in some cases of whole/partial image (without dithering) best fot text parts.
Try using PNGs instead of JPEGs for scanned pages from books & some other stuff.
Diffence of files size is visible from start even before optimising PNGs.

[Jaff]

Updated:

PNGout
latest - (22.09.2009) - DDL

OptiPNG
- latest 0.6.3 (18.05.2009) - DDL

PNG crush
- latest available for download v1.6.15 Win (20.04.2009) - DDL
- latest v1.7.2 (10.09.2009) (no binary available at this moment)

External programs:
ImageMagick
- latest version v6.5.6-4 (22.09.2009) - DDL HTTP / FTP


Download "Ultimate tool for PNG compression optimisation" updated 26.09.2009:
attachment / MIDI MANiACS @Xhost

* Note: pngopti.cmd changes:
- path for ImageMagick has been changed to C:\Program Files\ImageMagick\ (default install folder of program)
- various version tools have been updated

[Zymex]

thanks for the PNG optimization efforts I wish it did not rely on batch files, however.

I Not everyone is on broadband

Those who are not should stick to the Lynx browser or keep to using email. The web was NEVER designed with analog modem users in mind :P

I upload PNG images to my online gallery. Camera -> JPG is one lossy too many. I'll suffer until RAW is commonplace

[Intrinsic]

Hi, add these lines in place of the ones at the top of the file to add single file drag and drop support to the batch file. This will work for XP, untested on Vista/w7.

@echo off
setlocal enabledelayedexpansion
set PNGOptiDir=%~dp0
PATH %PNGOptiDir%;C:\Program Files\ImageMagick\;%PATH%
%~d1
CD %~p1
cls
set currentcolors=0

So this replaces the current top of the file which is:

@echo off
setlocal enabledelayedexpansion
PATH C:\Program Files\ImageMagick\;%PATH%
cls
set currentcolors=0

Makes it a lot easier to use than having to open a dosbox, hopefully someone will find this of some use.

Edit: And i'll also add this link to a brute force PNG slimmer, be warned though it can take HOURS(about 1 hour on my E8500 C2D for 1024x1024-ish images) on big images but will save quite a lot more(relatively speaking) compared to this one but at the expense of time. I only use it on small stuff, as an example an image i did just now @ 320x240 took just under 7 mins.
http://people.bath.ac.uk/ea2aced/tech/png/pngslim.zip

[WellOiledPC]

Compression of all kinds of files is important for countless reasons and boarder's paradise, its nice of you to share your efforts!

Jaff, your efforts at running tests and sharing the results are welcome. Not many people make that kind of effort! Well done, hope to see more of you in here!

[Jaff]

Updated:

PNGout
latest - (23.03.2010) - DDL

OptiPNG
- latest 0.6.4 (14.03.2010) - DDL

PNG crush
- latest available for download v1.7.9 Win (07.03.2010) - DDL
- latest v1.7.10 (13.03.2010) (no binary available at this moment)

External programs:
ImageMagick
- latest version v6.6.0-10 (26.03.2010) - DDL HTTP / FTP


Download "Ultimate tool for PNG compression optimisation" updated 26.09.2009:
.ZIP attachment / .ZIP @MIDI MANiACS/Xhost / .7Z attachment / .ZIP @ MIDI MANiACS / .7Z @ MIDI MANiACS

* Note: pngopti.cmd changes:
- various version tools have been updated
________________
*Archive Note:
- 866.521 - 7Zip (type: .ZIP / Compression level: Ultra / method: deflate / dictionary: 32kb / word size 256 bytes)
+ 866.520 - AdvZip (-z -4)
+ 866.282 - DeflOpt (/bd)

versus other .ZIP compressed archives
- 898.205 - TotalCommander 6.55 (internal, max 9)
- 899.576 - KGB Archiver 2
- 900.320 - WinRAR 3.93 (best)

- 579.970 - 7Zip (type: .7Z / Compression level: Ultra / method: LZMA / dictionary: 2MB / word size 256 bytes / solid block 2MB)
- 578.867 - 7Zip (type: .7Z / Compression level: Ultra / method: LZMA2 / dictionary: 2MB / word size 256 bytes / solid block 2MB)