Processing system with dynamic alteration of a color look-up table

A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:

• determining if an input block of the input data stream corresponds to a predetermined value;
• combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value;
• accessing the look-up table using an address corresponding to the result of the step of combining the input block with a previously-stored identifier of a first portion of the look-up table;
• and
• storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.

A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:

• determining if an input block of the input data stream corresponds to a predetermined value;
• combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value;
• combining a subsequent data block with the previously-stored identifier to thereby provide an address into the look-up table;
• and
• storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.

A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:

• determining if an input block of the input data stream corresponds to a predetermined value;
• combining the input block with previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value;
• combining a subsequent data block with the stored identifier of a second portion of the look-up table to thereby provide an address into the look-up table;
• and
• storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.

A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:

• determining if an input block of the input data stream corresponds to a predetermined value;
• combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value;
• and
• storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value,
• wherein the look-up table is a 2.sup.2y xm table, the data block is a y-bit data block and the identifiers of the first portion and the second portion are y-bit identifiers.

A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:

• determining if an input block of the input data stream corresponds to a predetermined value;
• combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value;
• and
• storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value,
• wherein the look-up table is a 256.times.16 table, the data block is a 4-bit data block and the identifiers of the first portion and the second portion are 4-bit identifiers.

An apparatus for converting an input data stream including a sequence of input data blocks into a converted stream, the apparatus comprising:

• a look-up table having a plurality of input address lines, wherein a first set of the input address lines are connected to receive an input block of the input data stream;
• a comparator having an input connected to receive an input block of the input data stream, and an output providing a signal indicative of whether the input block corresponds to a predetermined value;
• and
• a first register having a load signal input coupled to the output of the comparator, a data input connected to receive an input block of the data stream, and an output coupled to a second set of the input address lines of the look-up table, the register storing an identifier of a first portion of the look-up table, the register loading the input block as an identifier of a second portion of the look-up table if the input block corresponds to the predetermined value, and supplying the previously stored identifier of a first portion of the look-up table to the output of said register if the input block does not correspond to the predetermined value.