Barcode Xpress works with 1-bit black and white images, 8-bit grayscale images, and 24-bit color images.
Barcode Xpress for .NET Core should process images in any format that can be loaded into a System.Drawing.Bitmap, such as GIF, JPEG, EXIF, TIF, and PNG.
On Linux, BMPs of version 4 and higher are only supported when libgdiplus 6.0.1 or higher is installed on the system.