XnView Software

Hadrien Nilsson wrote:

• Clean your PNG files of useless or wrong information.
• Make your PNG files smaller.
• Convert into PNG other lossless image formats (BMP, GIF, TGA).
• Create PNG screenshots and make them easily available.
• Perform all those tasks in the simpliest and most productive way.

• new: support for APNG for both optimization and conversion (animated GIFs)
• new: x64 version
• new: PNG options moved to their own dialog window
• new: option to ignore animated GIFs
• new: option to keep original file date and time
• new: option to force background color (bkGD chunk)
• new: option to keep or force textual information (tEXt chunk)
• new: always on top option for the main window in the contextual menu
• new: suggested screenshot filename now keeps leading "0" for file number (file 001.png, file 002.png...)
• new: suggested screenshot filename now accepts "-" as a number separator (file-01.png file-02.png...)

• change: AvoidGreyWithSimpleTransparency is now disabled by default (was for IE6 compatibility)
• change: keyboard shortcut to clear the list is slightly less complicated: Ctrl+Delete instead of Ctrl+Shift+Delete

• misc: better results with some cases of indexed color images
• misc: updated ZLib 1.2.3 to 1.2.5 (compression library)

• fixed: bad % reported for large files
• fixed: hangs at startup when loading an empty configuration file (PngOptimizer.ini)
• fixed: could not load GIFs containing non-Netscape application extensions blocks (like XMP data from Photoshop CS)
• fixed: could not load GIFs with a compressed block ending with a terminator instead of an end-of-information code

eL_PuSHeR wrote:Ken Silverman's PNGOut or Cosmin Truta's OptiPNG are better in my humble opinion. I didn't try the command-line version, but the GUI one is really awful.

• PngOptimizer: Open source (GNU)
• PNGOut: 15$ to 30$
• OptiPng: Open source.(zlib/libpng)

• PngOptimizer: x86 & X64 | Reads: PNG, GIF, BMP, TGA.
• PNGOut: x86 only | Reads: PNG, GIF, TIFF, BMP, JPG.
• OptiPng: x86 only | Reads: PNG, GIF, BMP, PNM, TIFF.

• PngOptimizer: 2.5 sec | 342KB (70,4% of original)
• PNGOut: 24 sec | 372KB (76,4% of original)
• OptiPng: 4 Minutes 22 sec | 476KB (97,9% of original)

thibaud wrote:

eL_PuSHeR wrote:Ken Silverman's PNGOut or Cosmin Truta's OptiPNG are better in my humble opinion. I didn't try the command-line version, but the GUI one is really awful.

x86 only

[*]PngOptimizer: 2.5 sec | 342KB (70,4% of original)
[*]PNGOut: 24 sec | 372KB (76,4% of original)
[*]OptiPng: 4 Minutes 22 sec | 476KB (97,9% of original) [/list]

Minimal test: PngOptimizer beats OPTIPNG

thibaud wrote:[*]PngOptimizer: 2.5 sec | 342KB (70,4% of original)
[*]PNGOut: 24 sec | 372KB (76,4% of original)
[*]OptiPng: 4 Minutes 22 sec | 476KB (97,9% of original) [/list]

921'654 Original BMP 24bpp

after LIBPNG/PO/PNGOUT/OP only:

433'833 LIBPNG -9
433'188 PO
430'300 PNGOUT (rare missguess "/f5")
409'796 OP -o7 (brutes out "/f1")
392'538 PNGOUT /f1 | !!! WINNER !!!

after DEFLOPT additionally:

432'810 LIBPNG -9
432'810 PO         | !!! IDENTICAL to LIBPNG -9 above !!!
430'282 PNGOUT (rare missguess "/f5")
408'637 OP -o7 (brutes out "/f1")
392'525 PNGOUT /f1 | !!! WINNER !!!

DOS386 wrote: Most likely you swapped the results from PngOptimizer and PNGOut

• new: option to keep or force pixel physical dimensions (pHYs chunk)
• new: better compatibility for old Windows versions (NT based)
• new: Windows Seven taskbar icon now shows progression of an optimization
• new: better automatic dialogs placement when near screen borders, near taskbar or with multiple monitors
• new: the list is now scrollable with the keyboard
• new: "Done" written at the end of multiple files optimization
• new: screenshot directory dialog can be resized

• new: support of the ".apng" file extension
• fixed: only lower case file extensions were managed. The extension case is not relevant anymore.

PngOptimizer v2.2 (09/Sep/2012)

• new: multithreaded optimization for faster processing on multicore CPUs
• new: better optimization in some cases of greyscale images
• misc: updated ZLib 1.2.5 to 1.2.7 (compression library)

XnTriq wrote:

• new: multithreaded optimization for faster processing on multi
• new: better optimization in some cases of greyscale images
• misc: updated ZLib 1.2.5 to 1.2.7 (compression library)

DOS386 wrote:The changes seem very minor again.

XnTriq wrote:

• new: multithreaded optimization for faster processing on multi
• new: better optimization in some cases of greyscale images
• misc: updated ZLib 1.2.5 to 1.2.7 (compression library)

Why not use zopfli ? Then the author could finally beat PNGOUT and OPTIPNG

• misc: updated source code for Visual Studio 2012
• misc: welcome message is centered and appears only when the log window is empty
• fixed: some errors found with VS2012 static analysis tool
• fixed: small UI problem in the screenshots dialog
• change: removed batch summary for single file

• fixed: Windows XP compatibility for 32 bits build

• fixed: x64 build failed to open dialog boxes on Windows 8

• misc: updated file structure for git first commit

• misc: update code for GTK+ version
• misc: reorganize Windows code for multiplatform support
• misc: update distrib script to create a .deb package