How To Create A Custom Camera Profile Spyder

How to Create DCP Colour Profiles

1 What Are DCP Profiles and Why Do I Need Them?
ii Color Targets
3 More Info
4 Shooting the Color Target
v Creating the DCP
- 5.1 Creating DCP profiles using 10-Rite software
- v.2 Creating DCP profiles using DCamProf

1 What Are DCP Profiles and Why Do I Need Them?

Technically, each photosite in a digital photography photographic camera's paradigm sensor outputs a certain electric current based on the number of photons of light that hit that photosite. The current is converted into a number. These numbers, along with some metadata, are stored in what is known as a "raw file". At this bespeak in that location is no concept of color and the raw information looks zippo like an image. As in traditional photography, the image must be "developed" into a usable form. One of the steps of this development involves translating the numbers into accurate colors, and for that yous need to profile the camera, to map the numbers to specific known colors.

Practically, you must use an input color contour in order to become accurate colors, and currently the best fashion to go nearly this is using a "DNG camera profile" (DCP for short - do not misfile with the entirely unrelated Digital Movie theatre Parcel). The input color contour is what makes a camera'southward colors look they way they do when y'all open a photo, before y'all brand whatsoever tweaks.

RawTherapee ships with the post-obit profile types:

ICC - These are matrix profiles, tailored simply to daylight, not and then proficient in incandescent light. This is the one-time kind of profile.
DCP - These are the new types of profiles.
- DCP single-illuminant - These are tailored just to daylight.
- DCP dual-illuminant - These are tailored both to daylight and to incandescent light, then they perform great in nigh lighting situations.

You can create your own DCP profiles tailored to specific lighting situations for ultimate color accuracy. Let's say you are shooting a wedding ceremony, or panoramas for a virtual tour. You need authentic and consistent colors. The color spectrum of the light outside the building is completely different to that inside, and even indoors the light will differ between the rooms as general consumer lite bulbs produce light of different temperatures and spectrums, and there are commonly several different types of light bulbs illuminating a unmarried room. If you come prepared with a color calibration chart, such as the Ten-Rite ColorChecker Passport, all yous need to do is to take a photograph of this chart in the same location(s) as your normal photos, 1 shot per lighting situation (which normally translates to one shot per room and outdoors), then generate DCP profiles from these shots and utilize them in RawTherapee to accomplish correct and consistent colors and white residual between all your shots.

2 Color Targets

The all-time target for most shooting situations is one which is non-glossy, has good reference measurements, and is portable and rugged. For that reason we recommend the X-Rite ColorChecker Passport Photo.

Don't be mislead into thinking that the more patches a target has, the better - that is not the case, and having more than patches makes tweaking and producing a high quality DCP more hard.

Supported color targets:

Matte
- X-Rite ColorChecker Passport
- X-Rite ColorChecker 24, also known as the X-Rite ColorChecker Archetype
- Datacolor SpyderCHECKR
- 10-Rite ColorChecker SG
- QP-Carte du jour 203
- QP-Card 202
Glossy (difficult to use and therefore not recommended):
- IT eight.7 Reflective DIN A4 (Wolf Faust Coloraid C1)
- CMP Digital Target 8
- HutchColor HCT (Fuji RVP)

For more information, refer to the "Choosing test target" chapter of the DCamProf documentation: https://torger.se/anders/dcamprof.html#test_target

3 More Info

Find out more:

DCamProf manual https://torger.se/anders/dcamprof.html
10-Rite ColorChecker Passport product page: http://xritephoto.com/ph_product_overview.aspx?id=1257
Ten-Rite ColorChecker Passport PDF manual: https://www.xrite.com/-/media/xrite/files/manuals_and_userguides/c/o/colorcheckerpassport_user_manual_en.pdf
QPcard commodity on ICC and DCP color profiles: http://www.qpcard.com/dcp_icc_profile

4 Shooting the Color Target

An example of a perfectly executed target shot. The whole ColorChecker Passport is visible, it is centered and takes most i/3rd of the frame to avoid vignetting problems, it is perpendicular to the camera, in that location is no glare from the target every bit the target and the camera are positioned at a sufficient bending relative to the sun, there is no glare from the background, information technology was taken on an empty road far away from any reflective surfaces, and information technology is well exposed with the white patch being close to the right edge of the histogram without clipping (measured in RawTherapee using the neutral contour after picking the white balance off a gray patch).

Shoot the color target with the sun relative to yous in such a way that there is no glare - no direct sunlight bouncing from the target correct into your photographic camera. Note that in this incorrectly simplified 2D epitome the target is non facing the photographer, just in real life you lot would be positioned perpendicular to its surface.

A articulate, not-tinted incandescent tungsten calorie-free bulb. Use this blazon of light bulb for your StdA shot.

This guide assumes you use the X-Rite ColorChecker Passport, though y'all can utilise any supported color target. If using the X-Rite ColorChecker Passport, while it'south enough if yous shoot merely the 24-patch part we exercise prefer shots of the whole target.

The light shining on the colour target (the "illuminant") must encounter certain requirements ("standard illuminants"), and you will be shooting in two types of light:

Light from a not-tinted incandescent tungsten light bulb, known equally Standard Illuminant A, or StdA for curt.
Daylight, known as Standard Illuminant D, and you should strive for a light betwixt D50 (known as "horizon light") and D65 (known as "noon daylight").

At that place are two scenarios when you will want to shoot a color target:

To provide RawTherapee with an accurate full general-purpose dual-illuminant (StdA and D50/D65) DCP profile for employ by everyone with your camera model,
To handle specific lighting situations for yourself only.

In the sometime case, yous will want to accept extra care to make certain your profile sticks to the requirements because many people volition use it. In the latter case, you volition probably only apply that profile on that specific occasion, and it volition be of no use to other people.

Shooting the color target for inclusion in RawTherapee

We need photos taken in both incandescent low-cal and daylight.
Ideally, expect for a articulate, sunny day when the dominicus is high in a higher place the horizon, most the zenith at midday. Y'all tin as well photograph the target on a lightly overcast day around noon, but not on a stormy mean solar day, in winter, or even in summer in the early on morning or evening. You lot don't desire stray colors in the spectrum which appear when the lord's day is near the horizon or backside heavy clouds or smog.
For the daylight shot, detect a spot far away from anything that could reverberate light. Your balcony is not a practiced spot - the walls will reverberate lite and negatively influence the light spectrum, even if y'all can't see that with your blank eyes. The park is not a expert spot. Standing nether a transparent roof or lord's day umbrella is non a good spot. A large, empty-ish parking, far away from walls and trees and parked cars, is a bang-up place. Annihilation other than articulate, straight sunlight is bad. Forget about using a flash. Zippo matches existent sunlight.
For the incandescent shot, you lot need a existent tungsten light bulb, the kind that were used everywhere until the world moved to compact fluorescent lamps in the last decade. Don't utilise fluorescent lights - even if they have a warm color, the light spectrum is absolutely different to tungsten. Don't employ halogen lights. Don't use tinted bulbs.
Position your colour target and yourself relative to the source of the light (the sunday or the lite seedling) in such a fashion that the light does not bounciness directly from the target into your lens every bit that would cause glare, just too so that it does not come in at an extreme angle. When using a light bulb, to avoid uneven lighting, do not identify your target less than 1 meter away from it - two meters is a good distance.
Ensure that the face of the target is evenly lit and that the light reflecting from the ground and nearby objects does not fall on it.
While the sun is far away and yous could go away with tilting the color target not-perpendicular to the lord's day, a calorie-free seedling will exist close to y'all and due to the inverse-foursquare law a tilted target could endure from uneven lighting. Signal it towards the low-cal source to guarantee even lighting but in such a mode equally to avoid glare.
Ensure that the background is non-reflective so every bit to avoid background glare. A tar road or a blackness cloth work well, white paper does not.
Brand sure that the photos are precipitous. The DCP generation software needs to be able to identify dust and scratches to isolate them, and so do not shoot out-of-focus or with movement blur. Use a tripod for the incandescent shot.
Position the target and then that it fills the center-third of your frame - not more, non less. The center of the frame has the best optics and lowest vignetting.
Remove all filters from your lens.
Set your aperture to between f/five.6 and f/8. This minimizes vignetting.
Shoot at your photographic camera's lowest base ISO, typically ISO100. For the StdA shot don't go in a higher place ISO800 - use a tripod. Using ISO100 and f/8, typical exposure times for daylight are about 1/500s and for StdA about 1-5s.
Shoot raw (total raw, not "due south-Raw" or any other variety).
Turn off any camera setting which could influence the raw file, such as long exposure noise reduction.
Exposure bracketing is acceptable and even recommended - information technology volition assist you/us observe the all-time-exposed shot without clipping. eastward.g. shoot -1EV/0EV/+1EV. Feel free to send all three bracketed images (or all half dozen - 3 for daylight, three for StdA).
Rename and/or describe your photos - we don't know what "_DSC1234.DNG" means. Rename them to "MAKE MODEL light.extension" for example "NIKON D810 daylight +2EV.nef". If you lot're uploading more than one photo, describe how they differ. Allow usa know where in the globe you shot them, east.g. "Bikini Atoll, Marshall islands". Tell us when your target was manufactured, or at least the year when you bought it. A starting point to automatically rename the files using ExifTool:

exiftool '-FileName<${make}_${model}_iso${iso}_f${aperture}_%c.%le' dir
Read each of these points again and make sure your photo conforms to them before uploading.
Open a new upshot on the RawTherapee GitHub folio, upload your raw photos using Filebin and paste a link to them in your new GitHub issue. We are interested simply in the raw photos, non in a fix-made DCP - nosotros volition make one ourselves. If you bracketed, you can upload a series of each and nosotros will cull the best ones.

Shooting the color target in specific lighting situations for yourself

Equally above, you volition want the colour target to fill a 3rd of your frame, f/8, ISO100, abrupt, though the points nearly light do non apply hither. If y'all're shooting at an outcome at which you will take many photos under the same lighting conditions - business portraits, existent manor, a series of images for a 360° panorama in the woods, or a wedding - take a shot of the color target only before (or after) y'all take your actual photos.

5 Creating the DCP

In that location are several ways of creating a DCP. The simplest is using the software that came bundled with the exam target. The higher quality and open-source alternative is using DCamProf.

5.i Creating DCP profiles using Ten-Rite software

Simply install the X-Rite ColorChecker Passport software arranged with your chart (it works in Linux too using wine, but follow the same steps as outlined for installing Adobe DNG Converter in Linux) and open up your shot in information technology. It expects the shot to be in the DNG format, then you should first convert it to DNG. Using it is straightforward, it'due south intuitive.

5.2 Creating DCP profiles using DCamProf

DCamProf, written past Anders Torger, is a complimentary and open up-source command line tool for generating camera profiles and performing tasks related to photographic camera profiles and profiling. Notably, it tin generate profiles in both the ICC and DNG formats, and information technology is capable of generating high quality, smooth LUT profiles from CC24 shots or other targets.

The program has extensive, clear documentation. Use that as your main source of information. This RawPedia article serves just as a reference, to exemplify the procedure of using information technology to create a dual-illuminant DCP profile.

DCamProf GitHub project and documentation:

https://github.com/Beep6581/dcamprof
DCamProf homepage:

https://torger.se/anders/dcamprof.html

Y'all volition need ArgyllCMS to exist installed, as you demand to use some of its tools. In the case code below, the ArgyllCMS tools are prefixed with argyll-. This is needed by some distributions, such every bit Gentoo and Sabayon where the "scanin" executable is chosen argyll-scanin, just not by others, such as Ubuntu where it is called just scanin. Suit accordingly.

Color target photo cropped to 24-patch side, with brownish patch top-left.

To generate a dual-illuminant DCP profile from two ColorChecker Passport shots:

Take 2 photographs of the color target as described in a higher place in the Shooting the color chart department.
For each of the two photos, do the following:
1. Open up the photo in the latest version of RawTherapee,
2. Apply the Neutral profile,
3. Looking at the 24-patch target (if you target includes a second 26-patch side then ignore the 26-patch side), rotate information technology so that the brown patch is in the peak-left corner and the black one in the bottom-correct corner,
4. Activate the crop tool, disable "lock ratio", and crop the 24-patch target at the corner markers,
5. In the Color Management tool click the "Salve Reference Prototype" button, and in the window that appears make sure "Employ white balance" is not checked. Save the one shot as daylight.tif and the other equally tungsten.tif to the same folder which contains the compiled dcamprof executable.
Become into the folder with the compiled dcamprof executable and run:

argyll-scanin -five -dipn tungsten.tif /usr/share/argyllcms/ref/ColorChecker.cht information-examples/cc24_ref.cie tungsten-diag.tif argyll-scanin -v -dipn daylight.tif /usr/share/argyllcms/ref/ColorChecker.cht data-examples/cc24_ref.cie daylight-diag.tif ./dcamprof brand-contour -i StdA tungsten.ti3 tungsten.json ./dcamprof make-profile -i D50 -C daylight.ti3 daylight.json ./dcamprof make-dcp -n "Pentax K10D" -d "Pentax K10D" -c "RawTherapee CC0" -t acr -o neutral tungsten.json daylight.json "PENTAX K10D.dcp"

It is very important that during the make-dcp step y'all specify tungsten.json starting time and daylight.json 2nd!

In this example, the output file proper name is PENTAX K10D.dcp. You must utilize the name exactly as RawTherapee identifies information technology. Simply open the StdA or D50/D65 photo in RawTherapee and toggle the "Quick info" panel (shortcut fundamental "i") to come across which name RawTherapee identifies your camera as.

Your dual-illuminant DCP profile is set for utilize.

To take RawTherapee automatically use your new DCP, identify the DCP file in the dcpprofiles folder. This folder will typically be inside the RawTherapee installation folder in Windows, or in /usr/share/rawtherapee/dcpprofiles/ in Linux and macOS. Alternatively, create a new default PP3 for raw files which uses your new DCP - see Creating processing profiles for general use.

Per default DCamProf volition smooth the LUT to prioritize smoothness over accuracy. This makes the profile more robust for general-purpose use. If you wish you can command all smoothing parameters manually but it's by and large not needed. See DCamProf'southward documentation for further information.

Source: https://rawpedia.rawtherapee.com/How_to_create_DCP_color_profiles

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