Convert PNG to JBG

Understanding PNG and JBG file formats

PNG (Portable Network Graphics) is a popular raster image format known for its lossless compression and support for transparency. It is widely used for web graphics, digital artwork, and images requiring high quality and clear backgrounds.

JBG (Joint Bi-level Image Experts Group), also known as JBIG, is a format designed for compressing bi-level (black and white) images. It is commonly used in fax transmissions and document imaging systems due to its efficient compression of monochrome images.

Why convert PNG to JBG?

Converting a PNG to JBG is useful when you need to store or transmit black and white images efficiently, especially for fax or archival purposes. JBG offers superior compression for bi-level images compared to other formats.

How to convert PNG to JBG

Since JBG is intended for bi-level images, ensure your PNG is black and white before conversion. If your PNG is in color or grayscale, convert it to a 1-bit (black and white) image first.

Best software for PNG to JBG conversion

IrfanView is a versatile and free image viewer for Windows that supports conversion between many formats, including PNG and JBG (with the JBIG plugin).

• Download and install IrfanView and the JBIG plugin from the official website.
• Open your PNG file in IrfanView.
• Convert the image to black and white via Image → Convert to Greyscale and then Image → Decrease color depth → 2 colors.
• Go to File → Save As and select JBIG (*.jbg) as the output format.
• Click Save to complete the conversion.

Alternatively, ImageMagick is a powerful command-line tool available for Windows, macOS, and Linux. Use the following command to convert a PNG to a 1-bit JBG file:

magick input.png -threshold 50% output.jbg

Tips for successful conversion

• Ensure your PNG is strictly black and white for optimal JBG compression.
• Check the output file to confirm image quality and correct conversion.