javax.imageio.plugins.jpeg.JPEGQTable — clojure-interop/javax.imageio 1.0.0

A class encapsulating a single JPEG quantization table. The elements appear in natural order (as opposed to zig-zag order). Static variables are provided for the standard tables taken from Annex K of the JPEG specification, as well as the default tables conventionally used for visually lossless encoding.

For more information about the operation of the standard JPEG plug-in, see the JPEG metadata format specification and usage notes

*-k-1-div-2-luminance clj

Static Constant.

The sample luminance quantization table given in the JPEG specification, table K.1, with all elements divided by 2. According to the specification, these values produce very good quality output. This is the table usually used for visually lossless encoding, and is the default luminance table used if the default tables and quality settings are used.

type: javax.imageio.plugins.jpeg.JPEGQTable

*-k-1-luminance clj

Static Constant.

The sample luminance quantization table given in the JPEG specification, table K.1. According to the specification, these values produce good quality output.

type: javax.imageio.plugins.jpeg.JPEGQTable

*-k-2-chrominance clj

Static Constant.

The sample chrominance quantization table given in the JPEG specification, table K.2. According to the specification, these values produce good quality output.

type: javax.imageio.plugins.jpeg.JPEGQTable

*-k-2-div-2-chrominance clj

Static Constant.

The sample chrominance quantization table given in the JPEG specification, table K.1, with all elements divided by 2. According to the specification, these values produce very good quality output. This is the table usually used for visually lossless encoding, and is the default chrominance table used if the default tables and quality settings are used.

type: javax.imageio.plugins.jpeg.JPEGQTable

->jpegq-table clj

(->jpegq-table table)

Constructor.

Constructs a quantization table from the argument, which must contain 64 elements in natural order (not zig-zag order). A copy is made of the the input array.

table - the quantization table, as an int array. - int[]

throws: java.lang.IllegalArgumentException - if table is null or table.length is not equal to 64.

get-scaled-instance clj

(get-scaled-instance this scale-factor force-baseline)

Returns a new quantization table where the values are multiplied by scaleFactor and then clamped to the range 1..32767 (or to 1..255 if forceBaseline is true).

Values of scaleFactor less than 1 tend to improve the quality level of the table, and values greater than 1.0 degrade the quality level of the table.

scale-factor - multiplication factor for the table. - float force-baseline - if true, the values will be clamped to the range 1..255 - boolean

returns: a new quantization table that is a linear multiple of the current table. - javax.imageio.plugins.jpeg.JPEGQTable

get-table clj

(get-table this)

Returns a copy of the current quantization table as an array of ints in natural (not zig-zag) order.

returns: A copy of the current quantization table. - int[]

to-string clj

(to-string this)

Returns a String representing this quantization table.

returns: a String representing this quantization table. - java.lang.String