25 votes

Level adjusting images to hide internal features/detailing

A well know technique is called "luminosity masks". You create a selection mask where the pixels selection level is: 100% or near 100% in the luminosity range that you want to change, 0% or very low ...
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  • 16.1k
23 votes

Trying to have prints match closely to a monitor?

Other users gave great answers about tuning your computer. However since you mentioned costco, this is a costco specific answer: I've sent many prints to costco and had great luck. However not so ...
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15 votes
Accepted

CMYK vs RGB - Can a DSLR take CMYK images?

Inherently, no. The RGB model is natural for recording light, and the CMYK model is natural for printing (where reflected light is subtracted). But see Are RGB numeric values equal to CMYK ...
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  • 140k
14 votes
Accepted

How to configure the camera to capture true colors of ambient light?

The color correction is acting as expected. The point of using a color target is to adjust for the color of light to assume that the light is white. If you want to have the color that is present ...
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  • 34.4k
11 votes
Accepted

What is the purpose of gamma correction in today's screens and how does it relate to graphics and photography?

from Charles Poynton "The rehabilitation of gamma": Misconception: The nonlinearity of a CRT monitor is a defect that needs to be corrected. Fact: The nonlinearity of a CRT is very nearly the ...
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  • 4,825
11 votes

How can I check how much of sRGB and AdobeRGB my monitor covers in percentage?

The tool displaycal-profile-info, part of the DisplayCAL package, can do this. This works (and works basically the same way) for Windows, Mac, and Linux. See for example for my (calibrated) ThinkPad ...
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  • 140k
10 votes

Why not use a camera as a colorimeter?

Camera Colorimeter is an app on Google Play which uses the camera on your phone as a colorimeter for calibrating other devices. https://play.google.com/store/apps/details?id=com.auralisoft....
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  • 111
10 votes

What is the purpose of gamma correction in today's screens and how does it relate to graphics and photography?

I am a former broadcast engineer, and I currently work in feature films and television as an editor and VFX supervisor. Many statements on here are incorrect. Gamma in the signal path is a desired ...
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  • 512
10 votes

Level adjusting images to hide internal features/detailing

I'll interpret your question in the opposite way everyone else has. You seem to me to be asking how to prevent the details becoming visible again. Once you have darkened your image, increase the black ...
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  • 201
9 votes
Accepted

How to read a film color response chart?

Hopefully someone more knowledgeable than me will complete my response. The little I know about these curves follows: 1) Characteristic Curves: The more a negative is exposed, the darker it gets. The ...
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9 votes

What is the actual color space of film in film photography?

I think it was the EktaSpace that was invented to hold all colors of films. Since silver halide color papers are still used as media for printing from digital, there are also color profiles of ...
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  • 5,115
9 votes
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switched to RAW and seeing ugly light bands in Lightroom

The first thing you must realize is that what you are seeing on your monitor is not "the" raw file. What you are seeing is an 8-bit demosaiced preview conversion of the raw file created by ...
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  • 167k
8 votes
Accepted

Should I return my new wide-gamut monitor or buy an expensive calibrator?

Yes - you need to calibrate your monitor. One option, which is what I did, is to buy a relatively cheap colorimeter, at the time the Huey Pro was generally available. I used it as a travel ...
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  • 1,022
8 votes

What is the purpose of gamma correction in today's screens and how does it relate to graphics and photography?

Consider this example from Cambridge in Colour: By applying gamma encoding, we are able to represent the original image more accurately, with the same bit depth (5, in this example). This is ...
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8 votes
Accepted

A print shop gives me instructions to convert to sRGB instead an ICC profile, is no soft proofing necessary?

TLDR: Choose a print shop that provides ICC profiles. Soft proofing is an important step for optimal results. If a shop doesn't share its profiles there are two reasons that come to my mind: lack ...
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  • 1,256
8 votes

Xrite Colorchecker color specifications and 18% reflectance gray card

After further research, here is a partial answer taking as source Blog-Couleur: Quelles sont les valeurs RVB de la colorchecker ? and BabelColor PDF and the Xrite website. The last row seems to be ...
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  • 356
8 votes

Pictures uploaded to Facebook display wrong colors, but only in Firefox

According to ICC color correction in Firefox, Firefox has been capable of reading colour profiles in images since Firefox version 3 (released 17 June, 2008). This was configurable, and initially ...
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  • 8,934
7 votes

Color calibration red color cast

If the image is accurate for color there can be a few things going on here. None easy to fix. As I had mentioned in an earlier answer about LED display technology, this is more than likely a ...
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  • 1,795
7 votes
Accepted

Is it possible to "apply" a color profile to an image?

You would convert the image to the sRGB color profile. This profile is indended to match the color capabilities of a monitor. This is commonly used for images that are used in web pages, and for ...
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  • 20.8k
7 votes

How can I calibrate a Dell U2412M for 100% of Adobe RGB?

Carol, are you sure you have the U2414M? That's Dell's medium gamut variant of the monitor, covering about 75% of Adobe RGB. So I think that if that's the monitor you have, it's behaving as expected. ...
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  • 140k
7 votes
Accepted

Effective viewing of Margulis' latest tome

I asked Dan to answer your questions. Here is what he wrote: "Anything prepared with color fidelity in mind is best viewed in a graphic arts viewing booth or, if none is available, sunlight or ...
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  • 2,001
7 votes

Is it possible to buy chromaticity-plot color standards? If so, how, and where?

It simply isn't possible for any print, which only absorbs light, to produce a colorimetrically accurate and useful reproduction of the CIEXY human gamut "horseshoe." The curved boundary represents ...
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  • 1,207
6 votes
Accepted

How is data in a camera's colorspace transformed into XYZ or a standard RGB space?

The camera sensor does not have a color space that allows going back and forth to XYZ since it does not have the same sensitivity curves as the human eye (Luther - Ives condition). The best that can ...
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  • 241
6 votes

How can I fix the Pantone Huey Pro colour cast problem?

Users have identified the problem as faulty sensors however the problem is not faulty sensors but rather faulty filters. It appears that poor quality control has resulted in residue in the filters ...
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  • 111
6 votes
Accepted

What do the numbers mean in Canon printer profile names?

Hope this helps - Asked my Canon Rep as I was also interested and this is what he sent me; The ICC profiles installed for your printer and Canon photo paper appear as follows. CANON - PRINTER MODEL ...
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6 votes
Accepted

How do I calculate the coordinates for secondary colors on a CIE chromacity diagram?

Performing the operation directly using the chromaticity coordinates (ie: taking the midpoint between the two chromaticity coordinates) will yield incorrect results as the chromaticity diagram is ...
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6 votes

What is the actual color space of film in film photography?

I foud this graphic on photo.net, in a thread discussing the same topic: I can't vouch for its veracity, but it looks reasonable. Both of the depicted films are a bit wider than AdobeRGB in the reds, ...
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  • 6,770
6 votes

18% gray paint manufacturers

The standard gray card is 18% gray. Take a sample gray card with you to the paint store and have them custom mix. The reflection readings are: 0.75 red 0.75 green 0.75 blue 0.75 via the yellow visual ...
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6 votes
Accepted

How many distinct colors are in dci-p3 color gamut

A Color Gamut refers to colors within a Color Space which is a representation of which colors exist within it and which ones are not. It does not usually define a representation which is why there is ...
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  • 101k
6 votes

How is this sort-of duotone achieved?

I can't imagine how one would achieve these colours? There are two light sources, each with its own color. There's the very flat, cool, white light from the overcast, early morning or late afternoon ...
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  • 31.2k

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