color-management   261

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ACO Viewer - Free online ACO palette file reader and viewer.
A simple web service to view ACO files. Instantly view all the colors in Adobe Photoshop Color Swatch files .
color  Design  color-management  app  web-app 
9 weeks ago by cijanzen
An introduction to digital camera profiling
This article introduces camera profiling and potential sources of error. Successful profiling requires good photographic technique, a reliable target and a model that fits the device behaviour. I use Argyll CMS for camera profiling.
digital-imaging  color  color-management  cameras  photography  tutorials 
november 2018 by mikael
Camera Profiles define how a raw image is rendered by image processing software. Specifically, they contain a definition of exactly what the color of a particular pixel should be, relative to the raw data in the original image. Previous generations are Adobe’s image processing software (Photoshop/Camera Raw and Lightroom), had camera profiles for a wide variety of camera embedded within them. The latest generation of this software however has separated out theses profiles into DNG Camera Profiles. Although called DNG Camera Profiles, actually they apply to any raw file that an Adobe product loads.
photography  open-source  software  cameras  digital-imaging  color  color-management 
november 2018 by mikael
Yet some DNG comments (from a raw software developer)
It's not ideally composed for wide adoption in the industry, many aspects of it make it look like an Adobe-specific format rather than something anyone can adopt.

One rather provoking aspect is that many tags in the DNG spec are only weakly described in the documentation and are clearly just parameter settings for Adobe Camera Raw, such as the green split tag, which says: "This tag specifies, in arbitrary units, how closely the values of the green pixels in the blue/green rows track the values of the green pixels in the red/green rows." You can't have "arbitrary units" if you expect standard support, every tag must be precisely defined! There are many more examples of this.

The DNG format does not support much camera calibration data, frequently used in medium format camera formats such as IIQ and 3FR, things like flatfield correction. Adobe's own DNG converter solves this by cooking the file -- irreversibly applying the calibration data in the conversion process -- which is incompatible with some scientific applications where you indeed want the calibration data separate.

With the DNG format comes DNG camera profiles (DCP).
digital-imaging  dng  color  color-management  forum-posts  raw  software 
october 2018 by mikael
Lumariver Profile Designer
Contrary to popular belief, the camera profile rather than the camera sensor is the key factor in how colors appear in our digital photographs. However, due to legacy thinking rooted in the analog days, camera manufacturers and raw converter makers still feed us with “canned looks”. As a result colors are unpredictable, tuned to someone else’s taste, so when you move between camera models or raw converters your color expression is forced to change with it. We think that there is a better solution: break free from the canned looks and take control over your own color expression by making your own camera profiles. You get a good stable baseline for your own post-processing, regardless of camera brand or model, regardless of which raw converter you choose to use.
photography  digital-imaging  color  color-management  software 
october 2018 by mikael
Making a camera profile with DCamProf
The DNG profile format has a few advantages over ICC:

* Relatively well-defined how a profile should be applied (via the DNG specification).
* While ICC profiles are well-defined too, when it comes to camera profiles the practical use in raw converters has diverged from the standard and it’s not guaranteed that an ICC profile designed for one raw converter will work in the next.
* There are however still some undocumented aspects of DNG profiles, such as the black subtraction part, and the handling of baseline exposure is unclear.
* Dual-illuminant (eg tungsten + daylight) to make it possible to make an all-around profile to be used in several light conditions.
* Floating point natively (ICC v2 is integer).
* Separate LUTs for accurate scene-referred rendering and for output-referred subjective adjustments.
* A lot easier to understand than the multi-purpose ICC profile format.

However as DCP was introduced by Adobe and when other manufacturers have had their ICC-based color models for years it didn’t really catch on and become that new standard like Adobe hoped, at least not yet.

There are some technical limitations too, one is that DNG Profiles with LUTs will truncate the camera’s colors to the ProPhoto triangle which does mean that some of the human gamut is truncated.
dng  photography  cameras  raw  color  color-management  software 
october 2018 by mikael
Make Sony colors look like Canon?
I used the Color Checker Passport and their software to create a profile.

You can then go in with the Adobe DNG Profile Editor and "tweak" each of the 64 color points or "nodes" that are represented on the Color Checker. You can adjust each patch in terms of brightness, contrast, and saturation. (You can apply that profile to any file, not just DNG. In Lightroom it goes down with the Adobe and camera manufacturer profiles.)

I used to profile every new camera, and was pretty successful having my Nikon camera look very similar to my Canon. I haven't profiled my cameras for 2-3 years now, so I am not up on the current process. But this is what has worked for me in the past when getting a new camera, even a new Canon, and trying to nail down my color process/look.
tutorials  color  color-management  photography  sony  forum-posts 
october 2018 by mikael
Google, but for colors.
color  color-management 
august 2018 by odajay
Using Lightroom camera profiles (and why Adobe Standard is a liability)
The Adobe Standard camera profile is accurate for most mainstream cameras (typically Canon and Nikon), but for other cameras (particularly Sony), it may be incorrect. Irrespective of accuracy, the Adobe Standard profile can lack contrast, warmth or colour when used as a starting point, and you may be better off starting with one of the other profiles, depending on your composition.
color  color-management  adobe  lightroom  blog-posts 
march 2018 by mikael

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