JDeli is able to read and write images as PNG files, offering a complete PNG converter between PNG file format and lots of other image file formats.
JDeli can do this in ONE step with the convert method or separately read or write the PNG image if you want to process the image in Java.
Convert images to PNG from Command Line or another language
java -jar jdeli.jar --convert png "inputFileOrDir" "outputDir"
Convert into PNG or from PNG image file in Java
JDeli.convert(File inFile, File outFile);
JDeli.convert(InputStream inFile, OutputStream outfile, String format);
byte outputData=JDeli.convert(byte inputData, String format);
An additional set of methods allow values to be passed in which can give more control over conversion, depending on the image formats being converted (ie set compression level in Tiff files).
Multiple steps method for converting to or from PNG file format
2. Process image