Method for preserving spatial detail when applying a multidimensional tonal transform to a digital color image

Claim 3

The method as in claim 1 , wherein step (b) includes using a control signal for separating each digital image channel into two signals.

Claim 4

The method as in claim 2 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 5

The method as in claim 1 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 6

The method as in claim 2 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 7

The method as in claim 3 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 8

The method as in claim 6 further comprising the step of modifying the remaining signal before step (d).

Claim 11

The system as in claim 8 , wherein step (b) includes using a control signal for separating each digital image channel into two signals.

Claim 12

The system as in claim 9 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 13

The system as in claim 8 , wherein the modifying means further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 14

The system as in claim 9 , wherein the modifying means further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 15

The system as in claim 10 , wherein the modifying means further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 16

The system as in claim 13 further comprising the step of modifying the remaining signal before combining the two signals.

Claim 17

A computer program product for adjusting the color and tonal characteristics of a digital image comprising: a computer readable storage medium having a program stored thereon for performing the steps of: (a) receiving a digital image having two or more digital image channels wherein each digital image channel relates to a different color; (b) using a spatial filter for separating each digital image channel into two signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel; (c) using the first signal from each pair and a multidimensional transform for adjusting the color and tonal characteristics of the digital image to produce a modified first signal for each digital image channel; and (d) combining the modified first signal of each digital image channel with the corresponding second signal derived from the same digital image channel for producing an enhanced digital image channel.

Claim 18

A computer program product for adjusting the color and tonal characteristics of a digital image comprising: a computer readable storage medium having a program stored thereon for performing the steps of: (a) receiving a digital image having two or more digital image channels wherein each digital image channel relates to a different color; (b) using a spatial filter for separating each digital image channel into two signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel; (c) using the first signal from each pair and a multidimensional transform for adjusting the color and tonal characteristics of the digital image to produce a modified first signal for each digital image channel; and (d) combining the modified first signal of each digital image channel with the corresponding second signal derived from the same digital image channel for producing an enhanced digital image channel.

Claim 19

The computer program product as in claim 15 , wherein step (b) includes using a control signal for separating each digital image channel into two signals.

Claim 20

The computer program product as in claim 16 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 21

The computer program product as in claim 15 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 22

The computer program product as in claim 16 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 23

The computer program product as in claim 17 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 24

The computer program product as in claim 20 further comprising modifying the remaining signal before step (d).

Claim 27

The method as in claim 22 , wherein step (b) includes using a spatial filter for separating each digital image channel into the first and second signals.

Claim 28

The method as in claim 22 , wherein step (b) includes using a control signal for separating each digital image channel into the first and second signals.

Claim 29

The method as in claim 24 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 30

The method as in claim 22 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 31

The method as in claim 22 further comprising the step of modifying the remaining signal before step (d).

Claim 34

The system as in claim 28 , wherein the separating means includes a spatial filter for separating each digital image channel into the first and second signals.

Claim 35

The system as in claim 28 , wherein step (b) includes using a control signal for separating each digital image channel into the first and second signals.

Claim 36

The system as in claim 30 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 37

The system as in claim 28 , wherein the modifying means further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 38

The system as in claim 28 further comprising the step of modifying the remaining signal before combining the two signals.

Claim 39

A computer program product for adjusting the color and tonal characteristics of a digital image comprising: a computer readable storage medium having a program stored thereon for performing the steps of: (a) receiving a digital image having two or more digital image channels; (b) separating each digital image channel into first and second signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel, wherein the second signal is generated by subtracting the first signal from the respective digital image channel; (c) modifying one of the signals of each pair with a multidimensional transform for adjusting the color and tonal characteristics of the digital image; and (d) combining an output of step (c) with the remaining signal of each pair for producing an enhanced digital image.

Claim 40

A computer program product for adjusting the color and tonal characteristics of a digital image comprising: a computer readable storage medium having a program stored thereon for performing the steps of: (a) receiving a digital image having two or more digital image channels; (b) separating each digital image channel into first and second signals, thereby producing a plurality of pairs of first and second signals, one pair for each digital image channel, wherein the second signal is generated by subtracting the first signal from the respective digital image channel; (c) modifying one of the signals of each pair with a multidimensional transform for adjusting the color and tonal characteristics of the digital image; and (d) combining an output of step (c) with the remaining signal of each pair for producing an enhanced digital image.

Claim 41

The computer program product as in claim 34 , wherein step (b) includes using a spatial filter for separating each digital image channel into the first and second signals.

Claim 42

The computer program product as in claim 34 , wherein step (b) includes using a control signal for separating each digital image channel into the first and second signals.

Claim 43

The computer program product as in claim 36 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 44

The computer program product as in claim 34 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 45

The computer program product as in claim 34 further comprising modifying the remaining signal before step (d).

Claim 48

The method as in claim 40 further comprising creating the control signal from a spatially filtered version of the digital image.

Claim 49

The method as in claim 40 , wherein step (c) further comprises using a 3 dimensional look-up-table as the multidimensional transform.

Claim 50

The method as in claim 40 further comprising the step of modifying the remaining signal before step (d).