Class JpegConstants

Defines some JPEG constants.

Inheritance

System.Object

JpegConstants

Inherited Members

System.Object.ToString()

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

Namespace: BitMiracle.LibJpeg.Classic

Assembly: BitMiracle.LibJpeg.NET.dll

Syntax

public static class JpegConstants

Fields

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BITS_IN_JSAMPLE

The size of sample.

Declaration

public const int BITS_IN_JSAMPLE = 8

Field Value

Type	Description
System.Int32

Remarks

Are either: 8 - for 8-bit sample values (the usual setting)
9 - for 9-bit sample values 10 - for 10-bit sample values 11 - for 11-bit sample values 12 - for 12-bit sample values (not supported by this version)
Only 8, 9, 10, 11, and 12 bits sample data precision are supported for full-feature DCT processing.Further depths up to 16-bit may be added later for the lossless modes of operation. Run-time selection and conversion of data precision will be added later and are currently not supported, sorry. Exception: The transcoding part(jpegtran) supports all settings in a single instance, since it operates on the level of DCT coefficients and not sample values.The DCT coefficients are of the same type(16 bits) in all cases(see below).

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C_MAX_BLOCKS_IN_MCU

Compressor's limit on blocks per MCU.

Declaration

public const int C_MAX_BLOCKS_IN_MCU = 10

Field Value

Type	Description
System.Int32

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CENTERJSAMPLE

The medium sample value.

Declaration

public const int CENTERJSAMPLE = 128

Field Value

Type	Description
System.Int32

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D_MAX_BLOCKS_IN_MCU

Decompressor's limit on blocks per MCU.

Declaration

public const int D_MAX_BLOCKS_IN_MCU = 10

Field Value

Type	Description
System.Int32

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DCTSIZE

The basic DCT block is 8x8 coefficients

Declaration

public const int DCTSIZE = 8

Field Value

Type	Description
System.Int32

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DCTSIZE2

DCTSIZE squared; the number of elements in a block.

Declaration

public const int DCTSIZE2 = 64

Field Value

Type	Description
System.Int32

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HUFF_LOOKAHEAD

The number of bits of lookahead.

Declaration

public const int HUFF_LOOKAHEAD = 8

Field Value

Type	Description
System.Int32

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JDCT_DEFAULT

DCT method used by default.

Declaration

public const J_DCT_METHOD JDCT_DEFAULT = J_DCT_METHOD.JDCT_ISLOW

Field Value

Type	Description
J_DCT_METHOD

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JDCT_FASTEST

Fastest DCT method.

Declaration

public const J_DCT_METHOD JDCT_FASTEST = J_DCT_METHOD.JDCT_IFAST

Field Value

Type	Description
J_DCT_METHOD

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JPEG_MAX_DIMENSION

A tad under 64K to prevent overflows.

Declaration

public const int JPEG_MAX_DIMENSION = 65500

Field Value

Type	Description
System.Int32

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MAX_COMPONENTS

Maximum number of color channels allowed in JPEG image.

Declaration

public const int MAX_COMPONENTS = 10

Field Value

Type	Description
System.Int32

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MAX_COMPS_IN_SCAN

JPEG limit on the number of components in one scan.

Declaration

public const int MAX_COMPS_IN_SCAN = 4

Field Value

Type	Description
System.Int32

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MAX_SAMP_FACTOR

JPEG limit on sampling factors.

Declaration

public const int MAX_SAMP_FACTOR = 4

Field Value

Type	Description
System.Int32

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MAXJSAMPLE

The maximum sample value.

Declaration

public const int MAXJSAMPLE = 255

Field Value

Type	Description
System.Int32

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NUM_ARITH_TBLS

Arith-coding tables are numbered 0..15

Declaration

public const int NUM_ARITH_TBLS = 16

Field Value

Type	Description
System.Int32

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NUM_HUFF_TBLS

Huffman tables are numbered 0..3

Declaration

public const int NUM_HUFF_TBLS = 4

Field Value

Type	Description
System.Int32

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NUM_QUANT_TBLS

Quantization tables are numbered 0..3

Declaration

public const int NUM_QUANT_TBLS = 4

Field Value

Type	Description
System.Int32

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RGB_BLUE

Offset of Blue in an RGB scanline element.

Declaration

public const int RGB_BLUE = 2

Field Value

Type	Description
System.Int32

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RGB_GREEN

Offset of Green in an RGB scanline element.

Declaration

public const int RGB_GREEN = 1

Field Value

Type	Description
System.Int32

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RGB_PIXELSIZE

Bytes per RGB scanline element.

Declaration

public const int RGB_PIXELSIZE = 3

Field Value

Type	Description
System.Int32

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RGB_RED

Offset of Red in an RGB scanline element.

Declaration

public const int RGB_RED = 0

Field Value

Type	Description
System.Int32