Role of sensor in color rendering?

Started 3 months ago | Discussions thread
Erik Kaffehr
Erik Kaffehr Veteran Member • Posts: 4,178
Re: Role of sensor in color rendering?

lélé wrote:

Disclaimer:

  • I'm a hobbyist, with limited technical background on that particular topic...but eager to learn!:)
  • I'm not a native English speaker, so my wording may be inacurate not only because of my lack of technical knowledge, but also language/translation issues.
  • That said, I think I roughly understand the overall idea and differences behind 'colorimetry', 'color appearance' and 'pleasant colors'.
  • I don't want to (re)start any brand war!

=============

Hello!

I was playing around with Lumariver Profile Designer, an X-Rite ColorChecker SG color target an my Sony a7R IV. I was very surprised to see the color differences in skin tones I got with 'matrix only' profile. Those were backing up impressions I got, like hue shifting to more 'greenish' when in the shadows.

I also played around with other cameras files, in particular Canon ones, and this issue was less noticeable.

I was wondering how the camera sensor, in particular the CFA design, could impact that.

Mays you have more info' ?

Hi,

Some thoughts...

Pleasant color may not be accurate color, though accurate color may be a good starting point.

Next, white balance is probably the most important factor in color rendition, as long as illumination is continuous spectrum. Flourescents add their problems of their own.
Regarding skin tones, Andrew Rodney has a nice video on correcting skin tones.

I don't have a lot of personal experience with skin tones. But I did some testing with color rendition of very different cameras, without seeing huge differences.

The P45+ is an MFD back using a Kodak CCD from 2007, A900 is regarded as one of the best compromises regarding CFA design and the A7rII is the camera I use right now.

Differences are better viewed in a stacked TIF available here .

All cameras were tested with profiles generated with LumaRiver using the ColorChecker in each image.

Obvious no skin sample... :-(, sorry!

Best regards

Erik

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Erik Kaffehr
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