Enhance ociochecklut to print the output after each step in a multi-t…

[pennelee]

…ransform LUT

-s option will print the output after each step in the transform.

Tested with single RGB input as well as -t predefined RGB values.
Tested with various CLF files from OpenColorIO\tests\data\files\clf that have one, two and multiple operations.
Tested with --inv, --gpu, --gpulegacy

For cases with multiple operations, there are some differences in ouptut due to precision. For example:

Example with 2 Transforms:

ociochecklut.exe lut1d_comp.clf 0.18 0.18 0.18 -v

OCIO Version: 2.4.0dev

Input [R G B]: [ 0.18 0.18 0.18]
Output [R G B]: [0.5528838 0.525246 0.4975982]

ociochecklut.exe lut1d_comp.clf 0.18 0.18 0.18 -v -s

OCIO Version: 2.4.0dev

Transform 0:
Input [R G B]: [ 0.18 0.18 0.18]
Output [R G B]: [0.3441569 0.3441569 0.3441569]
Transform 1:
Input [R G B]: [0.3441569 0.3441569 0.3441569]
Output [R G B]: [0.5528837 0.525246 0.4975982]

Example with 9 Transforms:

ociochecklut.exe multiple_ops.clf 0.18 0.18 0.18 -v

OCIO Version: 2.4.0dev

Input [R G B]: [ 0.18 0.18 0.18]
Output [R G B]: [0.2754872 0.3039555 -0.06960445]

ociochecklut.exe multiple_ops.clf 0.18 0.18 0.18 -v -s

OCIO Version: 2.4.0dev

Transform 0:
Input [R G B]: [ 0.18 0.18 0.18]
Output [R G B]: [0.1866483 0.2251173 0.08405399]
Transform 1:
Input [R G B]: [0.1866483 0.2251173 0.08405399]
Output [R G B]: [0.2978297 0.394014 0.01335724]
Transform 2:
Input [R G B]: [0.2978297 0.394014 0.01335724]
Output [R G B]: [0.3367588 0.4664171 -0.04671562]
Transform 3:
Input [R G B]: [0.3367588 0.4664171 -0.04671562]
Output [R G B]: [0.3179022 0.4337091 -0.01955034]
Transform 4:
Input [R G B]: [0.3179022 0.4337091 -0.01955034]
Output [R G B]: [0.2819128 0.3884552 -0.01955034]
Transform 5:
Input [R G B]: [0.2819128 0.3884552 -0.01955034]
Output [R G B]: [0.6754353 0.760067 -0.05077279]
Transform 6:
Input [R G B]: [0.6754353 0.760067 -0.05077279]
Output [R G B]: [0.6506769 0.6723613 -0.08869568]
Transform 7:
Input [R G B]: [0.6506769 0.6723613 -0.08869568]
Output [R G B]: [0.2754877 0.3039553 -0.0006977472]
Transform 8:
Input [R G B]: [0.2754877 0.3039553 -0.0006977472]
Output [R G B]: [0.2754877 0.3039553 -0.06960447]

[remia]

Thank you @pennelee, this looks good to me. A minor suggestion could be to enable the print of the transforms list when using the -s flag, could be done updating line 275 to include stepInfo.

[pennelee]

Thank you @remia for the review and feedback! I added your suggestion to the changes.

[doug-walker]

Thanks for the contribution @pennelee !

[doug-walker]

Thank you @pennelee ! This will be very useful for a lot of us!