Addons -> PNGOUT

by XnTriq (Posted Sat Dec 24, 2016 12:30 am)
Hi SharkD.

SharkD wrote:In the XnView Filters menu it says the PNGOUT version is 1.00. Is this correct? Is there a newer, better version?

This version number refers to the file XnView/AddOn/PNGout.xnp which acts as an “intermediary” between xnview.exe and pngout.exe. The version of pngout.exe distributed with XnView v2.39 dates back to 02/Jul/2011. I believe you can replace XnView/AddOn/pngout.exe with the latest version (13/Feb/2015).

Another way of optimizing PNGs from within XnView is to use RIOT add-on:

SharkD wrote:Should I still be using PNGOUT today in 2016? Is there something else that works better?

I'm using mainly pngcrush…

Code: Select all

X:\pngcrush\pngcrush.exe -d X:\pngcrush\out\ -oldtimestamp -rem alla -reduce -brute X:\pngcrush\in\*.png

… and the GUI edition of PngOptimizer, but AFAIC there's nothing wrong with PNGOUT.

SharkD wrote:The reason I ask is because the version I have is stripping the alpha channel from the attached image, which is something that should never happen.

PNGOUT might have converted background_rain_shaped_c_test.png from truecolor with alpha channel to grayscale with alpha channel which is not supported by XnView.

• Original
  
  • 97'990 bytes (truecolor + alpha channel)
• Optimized
  
  • PngOptimizer v2.5
    85'770 bytes (truecolor + alpha channel, pHYs chunk removed, IDAT chunks consolidated)
  • pngcrush v1.8.10
    53'683 bytes (greyscale + alpha channel, pHYs chunk removed, IDAT chunks consolidated)
  • TinyPNG
    31'647 bytes (paletted + “cheap alpha”, pHYs chunk removed, IDAT chunks consolidated)

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