Class for loading JPEG Network Graphics Images.
public TJNGFileFormat = class(TNetworkGraphicsFileFormat);
ImagingNetworkGraphics (at line 157)
Loads all types of this image format (all images in jng test suite) and saves all types except 12 bit JPEGs. Alpha channel in JNG images is stored separately from color/gray data and can be lossy (as JPEG image) or lossless (as PNG image) compressed. Type of alpha compression, compression level and quality, and filtering can be set by options interface.
Supported ancillary chunks (loading): tRNS, bKGD (Images with transparency are converted to formats with alpha and pixels with transparent color are replaced with background color with alpha = 0).