convenience method for initializing a writer for the jpeg image format . concode_field_sep String imageFormat concode_elem_sep float writeCompressionQuality concode_elem_sep String writeCompressionType concode_elem_sep int writeCompressionMode concode_elem_sep String DEFAULT_IMAGE_FORMAT concode_field_sep void setWriteCompressionMode concode_elem_sep void setWriteCompressionType concode_elem_sep void setWriteCompressionQuality concode_elem_sep void write concode_elem_sep void write concode_elem_sep ImageWriteParam getImageWriteParameters concode_elem_sep ImageWriter lookupImageWriterForFormat