doug/OP> yay, ideas! Boo/delay: learning curve.
Thing1:
Found xnconvert is already on my linux Mint system,
   but havent figured out how to use it yet ( dont wanna crop via X/Y/Width/Height coordinates,
   i suspect if I get smarter it will let me crop via mouse.....)

Thing2:
Found caesium and/or caesiumPH  is free compile-able software, if I knew how to compile it I'd try it,
 since it mentions no-pixel-loss compression in caesiumPH.  I'm Qt-clueless however;

~/CaesiumPH-0.9.5-beta$
AUTHORS.md  CaesiumPH.pro  CHANGELOG.md  icons/  icons.qrc  LICENSE  qss/ 
                                  qt.conf  README.md  src/  style.qrc  TODO.md  translations/

doug> README says/includes...a bit more but below are the best hints:
##### REQUIREMENTS
* [mozjpeg](https://github.com/mozilla/mozjpeg)
* [Exiv2](http://www.exiv2.org/)
----------
##### TESTED PLATFORMS
* MacOSX El Capitan (v. 10.11.1)
* Windows 10 64 bit
* ArchLinux
----------
##### INSTALLATION
Binaries can be found at [GitHub](https://github.com/Lymphatus/CaesiumPH/releases/latest)
Linux source code must be compiled using Qt5.5.

doug> ~/CaesiumPH-0.9.5-beta$ l src
aboutdialog.cpp  cimageinfo.h       lossless.h*            qdroptreewidget.cpp*
aboutdialog.h    cphlist.cpp        main.cpp               qdroptreewidget.h*
aboutdialog.ui   cphlist.h          networkoperations.cpp  utils.cpp
caesiumph.cpp    ctreewidgetitem.h  networkoperations.h    utils.h
caesiumph.h      exif.cpp           preferencedialog.cpp
caesiumph.ui     exif.h             preferencedialog.h
cimageinfo.cpp   lossless.cpp*      preferencedialog.ui

doug> Tempted to try binaries and/or learn Qt  ( src/main.cpp clearly needs it w/o teaching me anything)
...................gotta run for now. Thanks ongoing.

On Fri, Aug 9, 2019 at 10:02 AM Joseph G via WLUG <wlug@lists.wlug.org> wrote:
Hello Richard,

Have you taken a look at these?

https://www.xnview.com/en/xnconvert/
https://saerasoft.com/caesium/

Enjoy your weekend,
Joe


On Fri, Aug 9, 2019 at 9:37 AM Richard Klein via WLUG <wlug@lists.wlug.org> wrote:
How do PNG files compare?

On Fri, Aug 9, 2019 at 8:05 AM Doug Mildram via WLUG <wlug@lists.wlug.org> wrote:
doug> I have a topic idea and/OR question-for-list-here+now, but only half a clue;
  I seek the Grail (our group's collective mind meld) on....

Resizing/cropping images efficiently w/r/t
  ( a) my time to perform the file manipuation, and
   (b)  efficient+good  JPG compression/filesize-shrinking.

In my nearly-abandoned Windows-OS world, I had/have an obscure tool ACDSee 
     which I paid $10-20 for, 25 yrs ago ! (still avail for windows only)  which....

--- is very easy/quick to use in my opinion
--- does an easy image rotation if needed
--- does an easy crop-and-save  (the main feature for me)
--- magically, without asking about quality/compression? DOES COMPRESS Very Well:
       .... I can crop most images (eg typical smartphone jpg around 4mb for example,
     ........ I can crop most of it and save with a typical result = 10-20% of original file size = 400-800k
     ........... and you wouldn't believe how good the 10%-smaller image tends to look.

GIMP can do these,  except seems to lack the magical quality of ACDSee for a downsize.

while doing GIMP's  Crop first, then Export to JPG, GIMP Export asks for a QUALITY in the 1-100% range,
if I choose 10% I do get a 400k file, but it's grainy as you might expect,
and I wonder how ACDSee does such superior compression with barely any loss/grainy result.  -------doug


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