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Beep6581 / RawTherapee

A powerful cross-platform raw photo processing program
https://rawtherapee.com
GNU General Public License v3.0
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Canon EOS 5D Mark II profiling #6318

Closed mburns9 closed 2 years ago

mburns9 commented 3 years ago

The Canon EOS 5D Mark II is a historically popular camera. So here is a raw shot of the classic ColorChecker 24 for profiling this camera.

https://drive.google.com/file/d/1DeMqV3a_2myUTq9Oeevi6oMyTfb8sIok/view?usp=sharing

mburns9 commented 3 years ago

This is taken in local prenoon time at Grand Rapids, MI. The sky is mostly blue.

Thanatomanic commented 3 years ago

@mburns9 Sorry it took so long to get back to you about this. I have generated a DCP profile based on your image, but it is not a high quality one. This is due to two factors:

  1. Foremost, the shot has raw clipping in the green channel. This likely makes interpolation in the highlights wrong. image
  2. It's a single illuminant profile. When your illuminant is not daylight, significant color changes can be expected. A good shot taken with a tungsten lightbulb as illuminant would be necessary to improve this.

Download here for testing: Canon EOS 5D Mark II.zip Unpack an load DCP from the Color Management tool.

Before we can consider packaging this dcp with a RawTherapee release, point 1 should be addressed. Point 2 would be very nice to have.

mburns9 commented 3 years ago

https://drive.google.com/file/d/1af0HF7UPUlUYgWNSFGn2L4z5aWsltMXT/view?usp=sharing Here is one taken with tungsten light from a clear bulb externally metered and exposed at EV3.

mburns9 commented 3 years ago

The DCP profile works well. The red patch becomes red.

mburns9 commented 3 years ago

https://drive.google.com/file/d/1Z6LY7xI_lEcYKRdeEGk8g5eFmDDqUtbU/view?usp=sharing I found a hazy sun shot with a better histogram.

mburns9 commented 3 years ago

The tungsten light raw at the link above is now improved - metered at EV2 and exposed at EV1.

Entropy512 commented 3 years ago

Just as advice here - it sounds like you're using autoexposure? I'd suggest manual exposure and, since most cameras don't have the ability to show a RAW histogram at capture, some bracketing - choose the most brightly exposed shot from the bracket that is not clipped.

mburns9 commented 2 years ago

Everything is compliant to RawTherapee standards in the last two links. Nothing prevents the making of a dual-illuminant profile for this popular camera.

If I had credit here, then I could post the profile myself.

Thanatomanic commented 2 years ago

Canon EOS 5D Mark II.zip

@mburns9 I have updated the DCP based on your new images. Please give this a testrun.

mburns9 commented 2 years ago

https://drive.google.com/file/d/1WrhC4zpxP1353qSjWVCsGnOc68tZFM4t/view?usp=sharing

Your profile looks good to me. It makes a difference for a pink flower and a copper ceiling.

mburns9 commented 2 years ago

https://drive.google.com/file/d/1SUWsiHvRdAtik61DgEk6TxhjW9Q5gpc5/view?usp=sharing

The copper ceiling looks better.