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Use Python for J2K to PNG Images Conversion

Create Python Apps to Convert J2K to PNG Images and Photos via Server APIs

How to Convert J2K to PNG Images and Photos with Python

Image files conversion from one format to another is a common task encountered by every graphic designer. The efficiency and excellence in converting files not only impact the speed of completion but also play a crucial role in assessing the overall work quality. Concerning the images sources, they frequently necessitate transformation into alternative formats more suited for printing or online distribution. An image crafted in a graphic editor is likely to be in vector format. In such instances, for website publication, it must undergo rasterization and be saved in a raster format. You have the option to convert the image in an uncompressed format for superior quality or save it to a lossless compressed format to minimize the file size. For scenarios where file size reduction is obligatory, like in website applications, there’s the possibility of conversion to lossy compression formats. Specialized data compression algorithms for images can significantly diminish file size while upholding acceptable image quality, ensuring swift image loading. To convert images and photos from J2K to PNG, we will employ Aspose.Imaging for Python via .NET API which is a feature-rich, powerful and easy to use image manipulation and conversion API for Python platform. You may install it using the following command from your system command.

The system command line

>> pip install aspose-imaging-python-net

Steps to Convert J2K to PNG via Python

Developers can easily load & convert J2K files to PNG in just a few lines of code.

  • load J2K file with Image.Load method;
  • create & set the instance of required subclass of ImageOptionsBase (e.g. BmpOptions, PngOptions, etc.);
  • call the Image.Save method;
  • pass file path with PNG extension & object of ImageOptionsBase class.

System Requirements

Before running the conversion example code, make sure that you have the following prerequisites:

  • Operating system: Windows or Linux.
  • Development environment: Supports .NET Core 7 and higher, such as Microsoft Visual Studio.

Free App to Convert J2K to PNG

  • Select or drag and drop J2K image
  • Choose format and click Convert button
  • Click Download button to download PNG image

Check our live demos to convert J2K to PNG

Convert J2K to PNG - Python

from aspose.imaging import *
from aspose.imaging.fileformats.tiff.enums import *
from aspose.imaging.fileformats.jpeg2000 import *
from aspose.imaging.fileformats.png import *
from aspose.imaging.imageoptions import *
from aspose.pycore import is_assignable
import os
if 'TEMPLATE_DIR' in os.environ:
templates_folder = os.environ['TEMPLATE_DIR']
else:
templates_folder = r"C:\Users\USER\Downloads\templates"
delete_output = 'SAVE_OUTPUT' not in os.environ
data_dir = templates_folder
def process_convertion():
import_formats, export_formats = get_available_image_formats()
for import_key, import_value in import_formats.items():
format_ext = import_key
input_file = os.path.join(templates_folder, f"template.{format_ext}")
if not os.path.exists(input_file):
continue
for export_key, export_value in export_formats.items():
output_file = os.path.join(templates_folder, f"convert-{format_ext}-to-{export_key}.{export_key}")
print("Processing conversion:" + output_file)
with Image.load(input_file) as image:
export_options = export_value.clone()
if is_assignable(image, VectorImage):
rasterization_options = import_value
rasterization_options.page_width = float(image.width)
rasterization_options.page_height = float(image.height)
export_options.vector_rasterization_options = rasterization_options
image.save(output_file, export_options)
if delete_output:
os.remove(output_file)
def get_available_image_formats():
obj_init = Jpeg2000Options()
obj_init.codec = Jpeg2000Codec.J2K
obj_init2 = Jpeg2000Options()
obj_init2.codec = Jpeg2000Codec.JP2
obj_init3 = PngOptions()
obj_init3.color_type = PngColorType.TRUECOLOR_WITH_ALPHA
obj_init4 = {}
obj_init4["bmp"] = BmpOptions()
obj_init4["gif"] = GifOptions()
obj_init4["dicom"] = DicomOptions()
obj_init4["jpg"] = JpegOptions()
obj_init4["jpeg"] = JpegOptions()
obj_init4["jpeg2000"] = Jpeg2000Options()
obj_init4["j2k"] = obj_init
obj_init4["jp2"] = obj_init2
obj_init4["png"] = obj_init3
obj_init4["apng"] = ApngOptions()
obj_init4["tiff"] = TiffOptions(TiffExpectedFormat.DEFAULT)
obj_init4["tif"] = TiffOptions(TiffExpectedFormat.DEFAULT)
obj_init4["tga"] = TgaOptions()
obj_init4["webp"] = WebPOptions()
obj_init4["ico"] = IcoOptions(FileFormat.PNG, 24)
raster_formats_that_support_export_and_import = obj_init4
obj_init5 = EmfOptions()
obj_init5.compress = True
obj_init6 = WmfOptions()
obj_init6.compress = True
obj_init7 = SvgOptions()
obj_init7.compress = True
obj_init8 = {}
obj_init8["emf"] = (EmfOptions(), EmfRasterizationOptions())
obj_init8["svg"] = (SvgOptions(), SvgRasterizationOptions())
obj_init8["wmf"] = (WmfOptions(), WmfRasterizationOptions())
obj_init8["emz"] = (obj_init5, EmfRasterizationOptions())
obj_init8["wmz"] = (obj_init6, WmfRasterizationOptions())
obj_init8["svgz"] = (obj_init7, SvgRasterizationOptions())
vector_formats_that_support_export_and_import = obj_init8
obj_init9 = DxfOptions()
obj_init9.text_as_lines = True
obj_init9.convert_text_beziers = True
obj_init10 = {}
obj_init10["psd"] = PsdOptions()
obj_init10["dxf"] = obj_init9
obj_init10["pdf"] = PdfOptions()
obj_init10["html"] = Html5CanvasOptions()
formats_only_for_export = obj_init10
obj_init11 = {}
obj_init11["djvu"] = None
obj_init11["dng"] = None
obj_init11["dib"] = None
formats_only_for_import = obj_init11
obj_init12 = {}
obj_init12["eps"] = EpsRasterizationOptions()
obj_init12["cdr"] = CdrRasterizationOptions()
obj_init12["cmx"] = CmxRasterizationOptions()
obj_init12["otg"] = OtgRasterizationOptions()
obj_init12["odg"] = OdgRasterizationOptions()
vector_formats_only_for_import = obj_init12
# Get total set of formats to what we can export images
export_formats = {k: v[0] for k, v in vector_formats_that_support_export_and_import.items()}
export_formats.update(formats_only_for_export)
export_formats.update(raster_formats_that_support_export_and_import)
# Get total set of formats that can be loaded
import_formats = {k : VectorRasterizationOptions() for k in formats_only_for_import}
import_formats.update(vector_formats_only_for_import)
import_formats.update({k : v[1] for k, v in vector_formats_that_support_export_and_import.items()})
return import_formats, export_formats
# run
process_convertion()

J2K What is J2K File Format

A J2K file is an image that is compressed using the wavelet compression instead of DCT compression.

Read More | J2K

PNG What is PNG File Format

PNG, Portable Network Graphics, refers to a type of raster image file format that use loseless compression. This file format was created as a replacement of Graphics Interchange Format (GIF) and has no copyright limitations. However, PNG file format does not support animations. PNG file format supports loseless image compression that makes it popular among its users. With the passage of time, PNG has evolved as one of the mostly used image file format. Almost all Operating Systems have support for opening PNG files. For example, Microsoft Windows viewer has the capability to open PNG files as the OS has by default the support available as part of installation.

Read More | PNG

Other Supported Conversions

Using Python, one can easily convert different formats including:

BMP (Bitmap Picture)
GIF (Graphical Interchange Format)
DICOM (Digital Imaging & Communications)
EMF (Enhanced Metafile Format)
JPG (Joint Photographic Experts Group)
JPEG (Joint Photographic Experts Group)
JP2 (JPEG 2000)
JPEG2000 (JPEG 2000)
PNG (Portable Network Graphics)
APNG (Animated Portable Network Graphics)
PSD (Photoshop Document)
DXF (Drawing Interchange Format, or Drawing Exchange Format,)
SVG (Scalable Vector Graphics)
TIFF (Tagged Image Format)
WEBP (Raster Web Image)
WMF (Microsoft Windows Metafile)
PDF (Portable Document Format (PDF))
HTML (HTML5 Canvas)
EMZ (Windows Compressed Enhanced Metafile)
WMZ (Compressed Windows Media Player Skin)
TGA (Targa Graphic)
SVGZ (Compressed version of Scalable Vector Graphics (.SVG) file.)
CANVAS (HTML5 Canvas)
ICO (Windows icon)