In this article, I would like to introduce a tiny image compression tool or image optimizer for PNG image files. The PNGOUT is a command-line utility that you can use to optimize any PNG file created by any other programs. You can run this application on both Windows Run dialog box or command prompt. Using a command prompt will be more effective as it has a lot of options that produce optimized lossless PNG images with size reduction.
PNGOUT – The image optimizer for PNG:
PNGOUT Command Line Options:
PNGOUT has the below list of command-line options that affect compression ratio.
Use the option /c followed by the number listed below.
- 0 – grayscale
- 2 – RGB
- 3 – palette
- 4 – greyscale + alpha
- 6 – RGB + alpha
Use the option /f followed by the number listed below.
- 0 – None
- 1 – Sub (delta x)
- 2 – Up (delta y)
- 3 – Average (delta x&y)
- 4 – Paeth
- 5 – Adaptive (mixed)
- 6 – Reuse (copy line by line from source PNG)
Use the option /s followed by the number listed below.
- 0 – Xtreme! (Slowest)
- 1 – Intense (Slow)
- 2 – Longest Match (Fast)
- 3 – Huffman Only (Faster)
- 4 – Uncompressed (Fastest)
PNGOUT exit codes or status codes:
The PNGOUT command line utility has certain exit codes when there are any error while executing the command or successful executing the command. These exit codes are useful when using batch files.
- 0 – Wrote file
- 1 – File error
- 2 – Unable to compress further
- 3 – Bad options
The PNGOUT commandline utility can be download from is official website.
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