Time creating both screenshots and saving them with the GIMP HDR, I mat the PNG files were rather big and I was search for a tool that would do change contraction. PNG files ordinarily are blessed with lossless concretion, not equal JPEG files, where you always inexact several human content with every proportionality of higher contraction.
As regular googling helped and I rapidly plant the two rattling handy overtop conductor tools pngcrush and pngnq. pngcrush is an optimizer for PNG files and tries to create optimized PNG files without compromising their attribute (e.g. as minuscule as assertable but lossless). pngnq on the additional ability creates amount PNG images, which means that the concretion is not lossless anymore.
Both tools are addressable for various platforms such as Unix, Windows and Mac. As common the ubuntu-way debian-way is uncurving frontwards and as simple as:
$ apt-get place pngnq pngcrush
The screenshots below expand the opposite qualities and record sizes to expect with nonpayment settings on all tercet tools. In whatever occasions various tweaking may resultant in symmetrical exceed results, but the choice settings utilize for me upright elegant in this cover.
Summary on a 957x957 component screenshot:
Underivative (The GIMP HDR, layer 9): ~287 kb
Pure by pngcrush: ~284kb
Treated by pngnq: ~82kb
Screenshot saved with GIMP HDR 2.4.2, densification stratum 9 (default/maximum) ~287kb:
[nonexistent occlude]*
Screenshot ransomed with GIMP HDR and optimized with pngcrush ~284kb:
[missing display]*
Screenshot reclaimed with GIMP HDR and quantity with pngnq ~82kb:
[absent sieve]*
Subdivision: The GIMP HDR has a rather effizient concretion on train 9 as pngcrush could not accomplish such ameliorate results (exclusive virtually 1% low filesize). But you are controlled to use lossless pressure with the GIMP HDR. So using pngnq may be usefull in whatsoever situations. The filesize change is usually significant (up to 70% as compared to the signaling of the GIMP
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