Correct parallel chromatic aberration caused by mechanical or optical inaccuracies

Processing
1

Hello everyone,

Inspired by this discussion, I have now developed a tool that corrects such errors: Scan Image Colour Aligner.

It delivers truly perfect results for my Braun MultiMag SlideScan 6000.

You can even use it to straighten the IR channel in RGBI TIFFs generated by VueScan, which could then improve the dust and scratch removal performed by VueScan after this intermediate step.

So if you still have RGBI raw TIFFs, feel free to run them through it.

I look forward to hearing your test reports.

4 Likes
2

Here an example from my Braun MultiMag SlideScan 6000 after scanning with VueScan.

Cutout of 48 bit RGB raw TIFF, dust-cleaned by IR channel with VueScan:
(note the color fringes)

Example with parallel chromatic aberration
Example with parallel chromatic aberration860×868 83.8 KB

After processing with Scan Image Color Aligner:
(note the detailed results in the .conf files in the examples folder
Example after correction
Example after correction860×868 83.5 KB

1 Like
3

Corrected link for the examples: