TweakPNG's validity check gives these PNGs a clean bill of health, and I can open them in Photoshop, Firefox etc., but XnView Classic/MP and MS Paint don't like them:
Search found 30 matches: tweakpng
Searched query: tweakpng
- Sat Jan 18, 2020 9:00 am
- Forum: Classic - Bug Reports
- Topic: [Solved] Problem viewing certain PNG files
- Replies: 3
- Views: 3131
- Tue Sep 12, 2017 10:30 pm
- Forum: New
- Topic: Can't Open File
- Replies: 44
- Views: 3508
Re: Can't Open File
I successfully opened your sample files with two dozen or more programs (including XnView MP). None of them had any problems whatsoever loading these images. Even all the diagnostic software I use on a regular basis (JPEGsnoop, TweakPNG, and Stuffware Photo Studio, to name but a few) gave them a clean bill of health.Brother Gabriel-Marie wrote:Right now I'm stuck with files that won't display, and I have no idea why. I can see them with any other program; just not MP. When I open a "broken" file in another program, say, Imagine (I use it as a plugin in FreeCommander) then it opens it fine. Photoshop opens them fine, too and nothing seems to be wrong with them.
- Sun Dec 25, 2016 4:30 am
- Forum: Classic - General Support
- Topic: Addons -> PNGOUT
- Replies: 14
- Views: 3138
Re: Addons -> PNGOUT
They're widely used, …SharkD wrote:Do you know which browsers support grayscale+alpha channel? Because even if XnView does not support it, it still might be a good idea to use it on my website.
- Grayscale + alpha channel
- Paletted + “cheap alpha”
Wikipedia (Transparency » [url=http://en.wikipedia.org/wiki/Transparency_%28graphic%29#Partial_transparency_by_alpha_channels]Partial transparency by alpha channels[/url]) wrote:Internet Explorer prior to version 7 does not support partial transparency in a PNG graphic.
Useful tools:Can I use… ([url=http://www.caniuse.com/#feat=png-alpha]PNG alpha transparency[/url] » Known issues) wrote:IE7 & 8 do not support PNG's alpha transparency when you apply CSS alpha filter on them or a parent element.
- Sat Nov 26, 2016 3:45 am
- Forum: Classic - Bug Reports
- Topic: 2.39: Error opening png file
- Replies: 5
- Views: 988
Re: 2.39: Error opening png file
Welcome to the forum, Stepa_ua.
I can confirm that XnView Classic v2.37 and v2.39 as well as MP v0.83 don't like SoftJig.png. I had no problem viewing it with v1.99 though, and TweakPNG gives it a clean bill of health.
Update:
I can confirm that XnView Classic v2.37 and v2.39 as well as MP v0.83 don't like SoftJig.png. I had no problem viewing it with v1.99 though, and TweakPNG gives it a clean bill of health.
Update:
- Sun Nov 20, 2016 11:15 pm
- Forum: Classic - Bug Reports
- Topic: 2.39: Gimp-made images crash XnView
- Replies: 18
- Views: 1960
Re: 2.39: Gimp-made images crash XnView
I don't have any problems opening Gradient.png either.
The file does not contain any metadata or a color profile.
The file does not contain any metadata or a color profile.
TweakPNG wrote:Code: Select all
Chunk | Length | CRC | Attributes | Contents ------+--------+----------+---------------------------+---------------------------------------------------------------- IHDR | 13 | c69676e4 | critical | PNG image header: 640×400, 8 bits/sample, truecolor, interlaced gAMA | 4 | 0bfc6105 | ancillary, unsafe to copy | file gamma = 0.45455 bKGD | 6 | a0bda793 | ancillary, unsafe to copy | background color = (255,255,255) pHYs | 9 | 009a9c18 | ancillary, safe to copy | pixel size = 2835×2835 pixels per meter (72.0×72.0 dpi) tIME | 7 | 9d44472a | ancillary, unsafe to copy | time of last modification = 20 Nov 2016, 16:10:12 UTC iTXt | 29 | 642e6507 | ancillary, safe to copy | text (international), key=“Comment”: “Created with GIMP” IDAT | 8192 | ce24ebab | critical | PNG image data IDAT | 8192 | 5191baca | critical | PNG image data IDAT | 8192 | 540c47ef | critical | PNG image data IDAT | 8192 | c1d270d1 | critical | PNG image data IDAT | 8192 | cd761d6d | critical | PNG image data IDAT | 8192 | 8ed13a12 | critical | PNG image data IDAT | 8192 | 1b6981a5 | critical | PNG image data IDAT | 8192 | 17a0503c | critical | PNG image data IDAT | 8192 | fa66f225 | critical | PNG image data IDAT | 8192 | f07a856b | critical | PNG image data IDAT | 8192 | 45b33ff2 | critical | PNG image data IDAT | 8192 | cb3d0844 | critical | PNG image data IDAT | 8192 | 3d0abd63 | critical | PNG image data IDAT | 8192 | 329de0f7 | critical | PNG image data IDAT | 8192 | 48a98318 | critical | PNG image data IDAT | 8192 | 880cd8f4 | critical | PNG image data IDAT | 8192 | b88cd8b2 | critical | PNG image data IDAT | 8192 | e720b281 | critical | PNG image data IDAT | 8192 | 395bd9da | critical | PNG image data IDAT | 8192 | bc6dac1a | critical | PNG image data IDAT | 8192 | 4e437488 | critical | PNG image data IDAT | 8192 | e4a4c4c8 | critical | PNG image data IDAT | 1322 | 11c5c22d | critical | PNG image data IEND | 0 | ae426082 | critical | end-of-image marker
- Sat Nov 12, 2016 6:45 am
- Forum: Classic - General Support
- Topic: Way to produce a transparent canvas?
- Replies: 6
- Views: 1051
Re: Way to produce a transparent canvas?
- 0_Example.png
1_XnView_Truecolor+Alpha.png
1_FireWorks_Truecolor+Alpha.png
1_SuperPNG_Truecolor+Alpha.png
2_XnView_Palette+Index.png
2_FireWorks_Palette+Index.png
2_PNGOptimizer_Palette+Index.png
3_TweakPNG_Truecolor+tRNS.png (Ignored by XnView)
4_FireWorks_Palette+Alpha.png (Supported by XnView since v1.97)
Will docday wrote:you might like this thread: https://www.diybookscanner.org/forum/vi ... 236#p20235
Maybe you have a better solution to the originating problem in the first post of the thread?

- Mon Jan 18, 2016 7:44 pm
- Forum: Customization
- Topic: Open with...
- Replies: 0
- Views: 3670
Open with...
XnView has an "open with" feature, i.e., if you right-click on a file you can select "open" F3 or "edit" F4 to get the same effect as in Windows explorer "open" or "edit". For images this is rather boring, "open" in explorer on my box starts XnView, so when I am already in XnView I rarely need F3. It is possible to define additional "open with" programs in XnView for any file, e.g., a hex. viewer better than the XnView built-in hex. viewer.
Disadvantages, when you want to get rid of a bad "open with" idea XnView only offers to delete everything, back to only F3 and F4. An additional "open with" tool works for any file, you cannot define something only for, say, PNG. Recently I decided that I want an "open command prompt here" feature also within XnView. And after that worked as expected I modified it to open tweakpng for PNG, or a command prompt for everything else. Eventually I arrived at a script opening exiftool -k for ICC / MIE / XMP, or dcraw -i -v for camera raw.
If you want similar "open with" functions you can copy and edit the code shown below, save it in a tools folder, where you have exiftool / dcraw / tweakpng / etc., and define it as "open with" application in XnView. For the latter XnView first offers to open an *.exe, but it is a simple plain text *.cmd, you have to select * to see all files including *.cmd, not only *.exe and also not only *.bat. The name doesn't matter, I use OPENDIR.cmd:
Disadvantages, when you want to get rid of a bad "open with" idea XnView only offers to delete everything, back to only F3 and F4. An additional "open with" tool works for any file, you cannot define something only for, say, PNG. Recently I decided that I want an "open command prompt here" feature also within XnView. And after that worked as expected I modified it to open tweakpng for PNG, or a command prompt for everything else. Eventually I arrived at a script opening exiftool -k for ICC / MIE / XMP, or dcraw -i -v for camera raw.
If you want similar "open with" functions you can copy and edit the code shown below, save it in a tools folder, where you have exiftool / dcraw / tweakpng / etc., and define it as "open with" application in XnView. For the latter XnView first offers to open an *.exe, but it is a simple plain text *.cmd, you have to select * to see all files including *.cmd, not only *.exe and also not only *.bat. The name doesn't matter, I use OPENDIR.cmd:
Code: Select all
@setlocal enableextensions & echo off
if not "%~2" == "" call "%~0" "%*"
if not "%~2" == "" goto :EOF
if "%~1" == "" goto HELP
if "%~1" == "?" goto HELP
if "%~1" == "/?" goto HELP
if "%~1" == "-?" goto HELP
set PADD=%~dp0;%PATH%;.
set NEED="%~1"
if not exist "%~f1" goto NEED
set NEED="%~f1\."
if exist "%~f1\*" goto OKAY
set NEED="%~f1\.."
if /I "%~x1" == ".ICC" goto EXIF
if /I "%~x1" == ".ICM" goto EXIF
if /I "%~x1" == ".MIE" goto EXIF
if /I "%~x1" == ".PNG" goto PING
if /I "%~x1" == ".ARW" goto CRAW
if /I "%~x1" == ".CR2" goto CRAW
if /I "%~x1" == ".CRW" goto CRAW
if /I "%~x1" == ".DNG" goto CRAW
if /I "%~x1" == ".ERF" goto CRAW
if /I "%~x1" == ".KDC" goto CRAW
if /I "%~x1" == ".KRO" goto CRAW
if /I "%~x1" == ".MEF" goto CRAW
if /I "%~x1" == ".MRW" goto CRAW
if /I "%~x1" == ".NEF" goto CRAW
if /I "%~x1" == ".NRW" goto CRAW
if /I "%~x1" == ".ORF" goto CRAW
if /I "%~x1" == ".PEF" goto CRAW
if /I "%~x1" == ".RAF" goto CRAW
if /I "%~x1" == ".RAW" goto CRAW
if /I "%~x1" == ".RW2" goto CRAW
if /I "%~x1" == ".RWL" goto CRAW
if /I "%~x1" == ".SR2" goto CRAW
if /I "%~x1" == ".SRW" goto CRAW
goto OKAY
:EXIF --------------------------------------------------------------
set NEED=exiftool.exe
for %%x in (%NEED%) do if exist "%%~f$PADD:x" set NEED=%%~f$PADD:x
if exist "%NEED%" goto CALL
set NEED=exifgui.exe
for %%x in (%NEED%) do if exist "%%~f$PADD:x" set NEED=%%~f$PADD:x
if exist "%NEED%" goto OPEN
if not exist "%NEED%" goto NEED
:PING --------------------------------------------------------------
set NEED=tweakpng.exe
for %%x in (%NEED%) do if exist "%%~f$PADD:x" set NEED=%%~f$PADD:x
if exist "%NEED%" goto OPEN
if not exist "%NEED%" goto NEED
:CRAW --------------------------------------------------------------
set NEED=dcraw.exe
for %%x in (%NEED%) do if exist "%%~f$PADD:x" set NEED=%%~f$PADD:x
if not exist "%NEED%" goto NEED
call "%NEED%" -i -v "%~f1"
goto WAIT
:OPEN --------------------------------------------------------------
start "%~n0" /D . "%NEED%" "%~f1"
goto :EOF
:CALL --------------------------------------------------------------
call "%NEED%" "%~f1"
goto WAIT
:NEED --------------------------------------------------------------
echo/
echo Error: %~nx0 found no %NEED%
:HELP --------------------------------------------------------------
echo Usage: %~nx0 FILE
echo/
echo Default action: Open a command window (CMD.EXE) in the folder
echo of the specified existing FILE or subdirectory.
echo/
echo Edit this script to run another program depending on the FILE
echo extension, e.g., for a PNG start TWEAKPNG.EXE, or for MIE start
echo EXIFTOOL.EXE.
echo/
:WAIT --------------------------------------------------------------
set NEED="%CMDCMDLINE:)=%"
for /F "usebackq tokens=2" %%c in ('%NEED%') do if %%c == /c pause
goto :EOF
:OKAY --------------------------------------------------------------
endlocal & cd /D "%NEED%" & cmd /k title %~nx0
- Mon Jan 11, 2016 9:25 pm
- Forum: Classic - Bug Reports
- Topic: certain PNGs cannot be saved
- Replies: 9
- Views: 3906
Re: certain PNGs cannot be saved
[...]XnTriq wrote:Trying to do so with m96yxdgsf6j8.png
2.35 can save this. The text chunks are gone (as promised), some 72 dpi pHYs chunk appears out of thin air, and the colour profile isn't identical (original: 2627 bytes, saved: 2520). Maybe libpng "upgrades" known colour profiles on the fly.still results in an “error writing the file”.

Unrelated, tweakpng is still at version 1.4.6, and I think its "import colour profile" feature is broken. But it can import complete colour profile chunks (exported from another PNG). Truepng.exe is at version 0.6.1.8, but I haven't tested yet if that fixes a truepng bug with odd PNG formats (IIRC 16bits grayscale didn't work for me with truepng 0.5.1.4.)
- Wed Dec 30, 2015 10:15 pm
- Forum: Classic - Bug Reports
- Topic: Error saving PNG
- Replies: 18
- Views: 6745
Re: Error saving PNG
Welcome back, omniplex 


(It's too bad that Heise had to shut down their UK operations.)

THX.omniplex wrote:...XnTriq wrote:WFM.Can someone please confirm?
I knew about Jason Summers' site and use some of his software (TweakPNG in particular). deark escaped my notice, though. Wow! Danke for the hint

I've actually posted a link to SimpelFilter before but I failed to realize that they also have LE editions which are free. So again: Thank you for pointing this out!omniplex wrote:Something else you presumably know, but I didn't see it in the plugin thread, there are some free and some shareware Simple Filter plugins by a German photographer. The free versions work for me in XnView. The XnView ICC option claims to affect JPEG and TIFF, but actually it also works for PNG:
Interesting series of articles by SimpelFilter's head honchoomniplex wrote:The XnView ICC option claims to affect JPEG and TIFF, but actually it also works for PNG:
[…]
source

(It's too bad that Heise had to shut down their UK operations.)
- Sat Dec 06, 2014 11:30 am
- Forum: Classic - Bug Reports
- Topic: certain PNGs cannot be saved
- Replies: 9
- Views: 3906
Re: certain PNGs cannot be saved
I'm glad to hear that you find the links useful, omniplex! (I assume you're referring to JohnFredC's topic about image quality.)omniplex wrote:Brilliant tool, I planned to add this to the "other software" forum as a thank you for lots of interesting links (today I read something about JPEG ELA forensics), but obviously you know TweakPNG already. I could post two scripts for the TweakPNG "tools" feature, combining PNGwolf+TruePNG (if anybody uses that, maybe Dos386.)XnTriq wrote:TweakPNG
TweakPNG has proven indispensable when it comes to solving PNG mysteries. There's lots of other cool stuff to explore on Jason Summers's site!
BTW: PngOptimizer discards the iCCP, pHYs as well as the tEXt chunks and combines all IDATs.omniplex wrote:Good to know, as it happens I have that, together with an "sRGB intent saturation" default. Kudos.XnTriq wrote:XnView will resave sample.png without error, if Use ICC Embedded Profile (JPEG/TIFF) - Very slow (Tools » Options... » General » ICC) is activated.
- Thu Dec 04, 2014 7:14 pm
- Forum: Classic - Bug Reports
- Topic: certain PNGs cannot be saved
- Replies: 9
- Views: 3906
Re: certain PNGs cannot be saved
Brilliant tool, I planned to add this to the "other software" forum as a thank you for lots of interesting links (today I read something about JPEG ELA forensics), but obviously you know TweakPNG already. I could post two scripts for the TweakPNG "tools" feature, combining PNGwolf+TruePNG (if anybody uses that, maybe Dos386.)XnTriq wrote:TweakPNG
Good to know, as it happens I have that, together with an "sRGB intent saturation" default. Kudos.XnTriq wrote:XnView will resave sample.png without error, if Use ICC Embedded Profile (JPEG/TIFF) - Very slow (Tools » Options... » General » ICC) is activated.
- Wed Nov 26, 2014 12:00 am
- Forum: Classic - Bug Reports
- Topic: certain PNGs cannot be saved
- Replies: 9
- Views: 3906
Re: certain PNGs cannot be saved
Here's the xnview.ini I use for my tests:xnview wrote:i can't reproduce
Code: Select all
[Cache]
IsActive=0
SavingMode=1
[Start]
ParamsSavingMode=1
SavingMode=1
TweakPNG ([color=green]default_rgb.icc[/color]) wrote:Code: Select all
Compressed size: 2341 Uncompressed size: 2576 ― Header ― Profile size: 2576 Preferred CMM type: “” Profile version: 2.1.0 Profile/device class: “mntr” Data color space: “RGB ” Profile connection space: “XYZ ” Profile creation time: 0-00-00 00:00:00 UTC Profile file signature: “acsp” Primary platform: “APPL” Embedded profile flag: 0 Dependent profile flag: 0 Device manufacturer: “” Device model: “” Attributes: Reflective, Glossy, Positive, Color Rendering intent: 0 (Perceptual) Illuminant: X=0.96419, Y=1.00000, Z=0.82489 Profile creator: “” Profile ID: 00000000000000000000000000000000 ― Tags ― Number of tags: 10 Tag #1 signature=“desc” offset=252 size=124 type=“desc” “Artifex Software sRGB ICC Profile” Tag #2 signature=“cprt” offset=376 size=40 type=“text” “Copyright Artifex Software 2011” Tag #3 signature=“wtpt” offset=416 size=20 type=“XYZ ” X=0.95045, Y=1.00000, Z=1.08905 Tag #4 signature=“bkpt” offset=436 size=20 type=“XYZ ” X=0.00000, Y=0.00000, Z=0.00000 Tag #5 signature=“rXYZ” offset=456 size=20 type=“XYZ ” X=0.43607, Y=0.22249, Z=0.01392 Tag #6 signature=“gXYZ” offset=476 size=20 type=“XYZ ” X=0.38515, Y=0.71687, Z=0.09708 Tag #7 signature=“bXYZ” offset=496 size=20 type=“XYZ ” X=0.14307, Y=0.06061, Z=0.71410 Tag #8 signature=“rTRC” offset=516 size=2060 type=“curv” Tag #9 signature=“gTRC” offset=516 size=2060 type=“curv” Tag #10 signature=“bTRC” offset=516 size=2060 type=“curv”
<--// EDIT //CreativeWorld ([url=http://newsgroup.xnview.com/viewtopic.php?p=115823#p115823]2.12 XnView: PNG resize[/url]) wrote:XnView versions after 2.05 are unable to (re)save some (?) PNGs, just creates an empty output file and exits without any messages (silently crashes?).
Sample file: http://i58.fastpic.ru/big/2013/1206/fe/ ... 40fffe.png
XnView will resave sample.png without error, if Use ICC Embedded Profile (JPEG/TIFF) - Very slow (Tools » Options... » General » ICC) is activated.
// EDIT //-->
- Tue Jul 29, 2014 11:00 pm
- Forum: New
- Topic: IPTC/XMP Editor does not save metadata in PNG files
- Replies: 18
- Views: 2414
Re: IPTC/XMP Editor does not save metadata in PNG files
Extracted from 14584184510_0e8e56a51d_o_d.png with TweakPNG:
Code: Select all
Chunk | Length | CRC | Attributes | Contents
——————+————————+——————————+———————————————————————————+—————————————————————————————————————————————————————————————————————————
IHDR | 13 | e2c59e60 | critical | PNG image header: 111x111, 8 bits/sample, truecolor+alpha, noninterlaced
sBIT | 4 | 7c086488 | ancillary, unsafe to copy | significant bits/sample: R:8,G:8,B:8,A:8
pHYs | 9 | 3d6683c7 | ancillary, safe to copy | pixel size = 787x787 pixels per meter (20.0x20.0 dpi)
tEXt | 25 | 9bee3c1a | ancillary, safe to copy | standard text: [Software]=[www.inkscape.org]
tEXt | 496 | 9076c43d | ancillary, safe to copy | nonstandard text: [Raw profile type iptc]=[…]
tEXt | 3674 | 7fd4a41d | ancillary, safe to copy | nonstandard text: [XML:com.adobe.xmp]=[…]
IDAT | 3867 | 20a7ea0a | critical | PNG image data
IEND | 0 | ae426082 | critical | end-of-image marker
tEXt chunk ([color=green]Raw profile type iptc[/color]) wrote:Code: Select all
IPTC profile 222 4e616d651c0250000642796c696e651c0255000c42796c696e65207469746c651c025a00 04436974791c025c00084c6f636174696f6e1c025f000553746174651c02640003555341 1c02650007436f756e7472791c0267001f4f726967696e616c207472616e736d69737369 6f6e207265666572656e63651c02690009486561646c696e652e1c026e00076372656469 74731c02730006536f757263651c02740009436f707972696768741c0278001a43617074 696f6e2c2063617074696f6e2c2063617074696f6e2e1c027a000e43617074696f6e2077 726974657200
tEXt chunk ([color=green]XML:com.adobe.xmp[/color]) wrote:Code: Select all
<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?> <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.1.2"> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> <rdf:Description rdf:about="" xmlns:Iptc4xmpCore="http://iptc.org/std/Iptc4xmpCore/1.0/xmlns/"> <Iptc4xmpCore:CountryCode>USA</Iptc4xmpCore:CountryCode> <Iptc4xmpCore:Location>Location</Iptc4xmpCore:Location> </rdf:Description> <rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/"> <dc:creator> <rdf:Seq> <rdf:li>Byline</rdf:li> </rdf:Seq> </dc:creator> <dc:description>Caption, caption, caption.</dc:description> <dc:rights>Copyright</dc:rights> <dc:title>Object Name</dc:title> </rdf:Description> <rdf:Description rdf:about="" xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"> <photoshop:AuthorsPosition>Byline title</photoshop:AuthorsPosition> <photoshop:CaptionWriter>Caption writer</photoshop:CaptionWriter> <photoshop:City>City</photoshop:City> <photoshop:Country>Country</photoshop:Country> <photoshop:Credit>credits</photoshop:Credit> <photoshop:Headline>Headline.</photoshop:Headline> <photoshop:Source>Source</photoshop:Source> <photoshop:State>State</photoshop:State> <photoshop:TransmissionReference>Original transmission reference</photoshop:TransmissionReference> </rdf:Description> </rdf:RDF> </x:xmpmeta> <?xpacket end="w"?>
Android the Andrew wrote:While looking at this, I noticed in the Info pane, under the Exiftool tab, under the Exiftool heading, there's a warning:
Warning Bad Photoshop IRB resource "\x20Cap"
- XnView Forum: Iptc tags from tiff to jpg badly written
- MetaCPAN: Image::ExifTool::Photoshop (Read/write Photoshop IRB meta information)
- Mon Jul 28, 2014 1:47 pm
- Forum: NConvert
- Topic: copy png to png expands palette
- Replies: 7
- Views: 2408
Re: copy png to png expands palette
Is not practical because... ? It doesn't run, or some other reason?dlang wrote:Using -colors <numColors> is not practical when I am converting a bunch of images using a DOS "for" loop command.
Code: Select all
for %f in (*.png) do nconvert -o out\%f %f
If you open an image in a GUI image editor such as XnView you should be able to see the image properties including the number of colours, or you could upload an example image.[/quote]I also do not know the number of color used in each image.
But that shows the number of colours??I used tweakPng to display the file details and noticed the palette size increased.
When a png file is opened NConvert may convert it to a 24-bit image while preserving the actual colours used; when you use the -colours option you would need to set a value equal to greater than the number of colours in the original image.
You should be able to do that using the following flag:I am using nconvert to strip off some of the meta chunk sections (text, iText, and zText).
-rmeta : Remove Metadata (EXIF/IPTC/...)
Have you created a list of the available NConvert commands using -help ?
- Mon Jul 28, 2014 1:13 pm
- Forum: NConvert
- Topic: copy png to png expands palette
- Replies: 7
- Views: 2408
Re: copy png to png expands palette
Using -colors <numColors> is not practical when I am converting a bunch of images using a DOS "for" loop command.
for %f in (*.png) do nconvert -o out\%f %f
I also do not know the number of color used in each image.
I only determined that nconvert was expanding the palette because some of my images got larger (size on disk).
I used tweakPng to display the file details and noticed the palette size increased.
I am using nconvert to strip off some of the meta chunk sections (text, iText, and zText).
for %f in (*.png) do nconvert -o out\%f %f
I also do not know the number of color used in each image.
I only determined that nconvert was expanding the palette because some of my images got larger (size on disk).
I used tweakPng to display the file details and noticed the palette size increased.
I am using nconvert to strip off some of the meta chunk sections (text, iText, and zText).