X rite colorchecker passport magenta tint

Started 4 months ago | Discussions thread
ggbutcher
ggbutcher Senior Member • Posts: 1,192
Re: X rite colorchecker passport magenta tint

Iliah Borg wrote:

Entropy512 wrote:

Iliah Borg wrote:

Entropy512 wrote:

Mark Scott Abeln wrote:

Steve BB wrote:

Are colour profiles meant to be 'exact'

No.

At least not if generated from a generic calibration target.

Actual SSF measurements of the sensor are going to give the best results, but there will always be tradeoffs when you're dealing with a Bayer CFA, and getting SSF measurement requires equipment that 99.9%+ of the population won't have access to.

A comparison of the price of equipment and time necessary to setup a high quality target borrowing / renting a spectroradiometer starts to look like a better option.

I've only seen one person (Glenn Butcher) come close to a reasonably affordable solution that seems to deliver OK results. Iliah and Alexey have Spectron which is more affordable than most SSF solutions, but still pretty expensive and out of reach for most people.

Takes less than $1000 to build, and if you already have a spectrometer like ColorMunki or i1Pro, it's even cheaper.

The MC1-02 monochromator alone is $2000.

AFAIK most builders got their monochromators from e-bay for 10 to 20% of that price.

When I was building the lightbox, I looked a few times at ebay and couldn't find a monochromator for under $800US. Just looked now, found a Bausch and Lomb device for $450US...

.. https://www.dynasil.com/product-category/mini-chrom-monochromators/standard-monochromator/

Every integrating sphere I've tried to find is also $$$$$

AFAIK most build their own, it's easy and instructions are available through googling.

The guy at MaxMax just piped the monochromator output into a fiber optic cable and pointed it directly at the sensor on the lens-less camera... ??

https://maxmax.com/faq/camera-tech/spectral-response

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