How to Create Lens Cast Correction (LCC) Reference Images using Capture One

[gcreglia]

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I wrote a blog post on creating LCC reference files to correct images with a color cast using Capture One.

https://www.leicaphotoworkshops.com/how-to-create-lens-cast-correction-lcc-reference-images-using-capture-one/

Any feedback would be greatly appreciated.

Thanks,

Gino, LP Workshops 

[jaapv]

I am a simplistic person. I always use a folded sheet of paper against an evenly grey sky to create LCC reference shots. I take a series at different apertures, as a throwback to my M8 days.

[dpitt]

How important is it that the piece of plastic or paper used is neutral white? In other words could any opaque piece of plastic be used?

[hansvons]

3 hours ago, dpitt said:

How important is it that the piece of plastic or paper used is neutral white?

It can be an evenly lit white wall. How much a lens vignettes is often an artistic choice. In many cases, you can as well use the vignette tool invertedly.

[gcreglia]

7 hours ago, dpitt said:

In other words could any opaque piece of plastic be used?

The white semi-opaque piece of plexiglass I bought is 3/16 of an inch in thickness. I would use those dimension for looking at options.

[gcreglia]

4 hours ago, hansvons said:

In many cases, you can as well use the vignette tool invertedly.

Yes, you can correct for light falloff using the vignette tool in Capture One. I appreciate your input and will update my article to touch upon using the vignette tool to correct for light falloff. 

[jaapv]

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Still, the aberrations you mention are mostly aperture-dependent. So you need to create reference images at different apertures. 

[Photoworks]

it is not all vignetting, some corrections are color uniformity across the frame, and at times you can use it to remove dust.

Vignetting is the main adjustment, that I often use for the reproduction of art and or film-scanning with the camera.

One of my main use options is in Architectural photography, The use of shift lenses can create a light fall off on one side. The regular vignetting tool correction would not work, but LCC can give good results. Just have the Plexy card with you when you shoot and do a frame with and one without.

[ynp]

I used to use this technique to get the uniformity of bigger paintings  I copied. I use the Sinar opaque disk. It’s totally neutral. 

Edited May 24, 2023 by ynp