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// For complete examples and data files, please go to https://github.com/groupdocs-conversion/GroupDocs.Conversion-for-Java
ConversionHandler conversionHandler = new ConversionHandler(Utilities.getConfiguration());
// Save options
ImageSaveOptions saveOptions = new ImageSaveOptions();
saveOptions.setOutputType(OutputType.String);
saveOptions.setConvertFileType(ImageSaveOptions.ImageFileType.PSD);
PsdOptions psdOptions = new PsdOptions();
psdOptions.setColorMode(PsdOptions.ColorModes.GRAYSCALE);
psdOptions.setCompressionMethod(PsdOptions.CompressionMethods.RAW);
saveOptions.setPsdOptions(psdOptions);
List<String> result = conversionHandler.<List<String>> convert(sourceFileName, saveOptions);