Type alias JpegOptions

Type declaration

• Optional noSubsample?: boolean

  If true, chrominance sub-sampling is disabled

• Optional optimizeScans?: boolean

  If true, split the spectrum of DCT coefficients into separate scans

• Optional overshootDeringing?: boolean

  If true, enables overshooting of samples with extreme values

• Optional progressive?: boolean

  If true, enables progressive JPEG compression

• Optional quantizationTable?: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8

  Quantization table to use

  0: Table from JPEG Annex K (default);
  1: Flat table;
  2: Table tuned for MSSIM on Kodak image set;
  3: Table from ImageMagick by N. Robidoux;
  4: Table tuned for PSNR-HVS-M on Kodak image set;
  5: Table from Relevance of Human Vision to JPEG-DCT Compression (1992);
  6: Table from DCTune Perceptual Optimization of Compressed Dental X-Rays (1997);
  7: Table from A Visual Detection Model for DCT Coefficient Quantization (1993);
  8: Table from An Improved Detection Model for DCT Coefficient Quantization (1993).
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• Optional trellisQuant?: boolean

  If true, enables trellis quantization for each 8x8 block