REM Used optiPNG as optimal filter detector. however i need PNGout to give feedback to my batch, about whatever it did improve the compression or OFFĮCHO Trying out PNGout with different blocksizeĮCHO Trying to futher improve compression Autmatic upscaling chunkc size for PNGout. more usage of optipng (more compression combos) I have add'et the DeflOpt.exe utiltiy which remove somewhere from 3 tol 40bytes most of the time a few time even more. I'm now using optipng to find the best delta filter which is quicker then running 5 trials of pngout and seem so far to work just as good.
ECM TOOLS NEILL CORLETT FULL
The resulting compressed size can be 15-20 smaller than the equivalent full disc compressed image. RAR compression or another compression algorithm. Once encoded to the ECM format, the ECM file can then be compressed using. My new pngbest4 is both better and quicker then pngbest3. ECM files are created from disc images such as. Ultimately this script is slow- but gives me the level of compression I need. For the fastest results but poor compression, just run Stage01, 04 & 99 (avoiding pngout). Stage03 is the slowest and yields the smallest compression. For faster compression it is possible to delete different 'stages' of the script. Try these settings: MinBlockSize=1024, LimitBlocks=2, RandomTrials=1. There is also great info here: įor small images sometimes simpler compression (RLE vs adaptive Huffman) is more effective.Īs the 'readme' states, you can speed the script up a bit. one day I might have time to implement something more complex- but computer time is cheap and my time is limited! :-)Īs for "why try PNGout with every compression level"- this is explained in the forums I linked to. However, there is still room for a lot of improvement. BTW, although it may not offer much comfort the script is relatively smart- with input from various png Gurus including the authors of OptiPNG, pngout and DeflOpt. When optimizing images ~150bytes, subtle differences in palette arrangement and how Huffman tables are arranged start to matter. If you are compressing fairly large screen captures it is easier to guess good parameters- and in terms of percentage improvements- not worth while do such compression trials. This is also part of the reason so many different combinations of compression parameters are tested. I should have said that I use this on icon style images < 32x32 pixels! Please know that you will need to use the newest version of pngout that does only save if the output is smaller.
ECM TOOLS NEILL CORLETT PRO
REM Save PNG with Paintshop pro for smallest file in the end. REM PNGopti dumped because of bad compression. REM PNGrewrite dumped as preprocessing, because it made files bigger. REM - Combine same color/multiple palet entries into one palette entry. REM by going from lineary to "2D" execution of filters/chunks REM Improve execution time and numbers og filter/chunks combos REM to only output smallest file and thereby reducing batch call REM Improved excecution time by using pngouts built-in funktion ECHO Finding optimal chunk size with the optimal delta filterĮCHO Trying with advpng to improve compression (7-zip deflate)
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