ImageGear v26.5 - Updated
Developer Guide / File Formats and Compressions / Compressions / JPEG Compressions / Lossless JPEG Compression
In This Topic
    Lossless JPEG Compression
    In This Topic
    Full Name Lossless JPEG compression
    Compression ID ImGearCompressions.JPEG = 6
    ImageGear Assembly ImageGear.Core Assembly
    Bit Depth Gray level: 8, 16 bpp; RGB: 24, 48 bpp
    File Formats JPEG, TIFF

    Comments

    Lossless JPEG is an extension to the normal JPEG standard. One of the main algorithmic differences between the two is that the lossless JPEG does not apply a Discrete Cosine Transform. Rather, it uses a Predictive scheme. For each pixel, the values of one or several neighboring pixels are added to the value of the original pixel and then subtracted from the value of the original pixel. This method yields smaller values that require fewer bits per pixel to store.

    ImageGear allows you to set the number of neighboring pixels to use in calculating the "predictor value".