>>3231596If you only need around 10% reduction in size, you can usually get it under the 4 MB limit just by recompressing the PNG. PNG uses DEFLATE for compression so this is lossless. This one took about a minute on an i5-4440 using PNGOUT. (
http://advsys.net/ken/utils.htm) TweakPNG (
http://entropymine.com/jason/tweakpng/) can squeeze out a few more KB by combining IDAT chunks if they aren't already.
PNGOUT is command-line only so here's a helpful batch file for recompressing a single PNG, just drag it onto the batch file
>pngout %1 "%~n1_out.png" /ks /k1 /f5 /forceand one for dragging multiple files
>@echo off>if [%1]==[] goto :eof>:loop>pngout %1 "%~n1_out.png" /ks /k1 /f5 /force>shift>if not [%1]==[] goto loop 