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4

CMYK CMYK is a subtractive colour model rather than an additive as in the case of sRGB. The subtractive colour models are used in printing since they allow dyes, ink or paint pigments to absorb certain wavelengths from an otherwise white surface. The dyes, ink and paint pigments can be a very limited discrete set that are mixed to get a wide range of ...


3

There's a lot of confusing articles on gamma correction with many vague references to gamma and human vision. The reason for gamma is historical and a result of the response curve of the old CRT-type monitors (nothing to do with human vision). With modern day flat screens there is no logical reason for gamma encoding and subsequent correction, but it has ...


3

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 inverse of the lightness sensitivity of human vision. The nonlinearity causes a CRT’s response to be roughly perceptually uniform. Far from being a defect, ...


3

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 achieved by using the 32 levels in a way that more closely corresponds to the human eye. In other words, it's a form of compression. JPEGs, for example, can actually ...


3

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 be done is come up with a transform matrix that minimizes the sum of the errors in LAB for the set of standard colors (Gretab -Macbeth). I believe this process ...


3

The covered range of colors (called gamut) is different between color spaces because these ranges are then discretized, "digitized", represented on a fixed amount of bits, and then reproduced on a monitor, in print, etc. One wants to store as much color information as possible in a certain amount of bytes. Now, if you have an equipment which can only emit ...


3

CMYK is based off of offset printing capabilities where you are using only specific shades of Cyan, Magenta, Yellow and Black ink being laid down from separate printing plates to print full color. It isn't mechanically capable of reproducing very saturated colors. But ... most photo inkjets don't expect you to send generic CMYK files to them. They have ...


2

Honestly, two different monitors are always very very hard to get the same. If you really want them both to look the same, you should get two of the same monitor. This is especially difficult in your situation, where one is a touch screen (lots of wires an other bits to alter the color). Plus they are both TN panels, so the color will shift depending on the ...


2

Is it possible to calibrate correctly and identically (or nearly) 2 monitors? Only if they're identical display types. There are many different types of LCD display, and several non-LCD display types besides. Two different display types may simply be incapable of producing the same color gamut, brightness levels, evenness of illumination, contrast, etc. ...


1

What I don't get is why the photo viewer window of the big screen is red while the other is grey. Is this just an issue of one windows being activated? Besides that: Be aware that the Microsoft Photo Viewer is not fully supporting color management. So when comparing I suggest you to use Photoshop. Furthermore, not every monitor has got the same color ...


1

You can calibrate your screens to look the best they can for showing you correct colors for photos (or as close as it can get), but it's going to be very difficult to get two totally different brand screens to display exactly the same. Try messing with the settings on the monitor itself. From what I can tell your external monitor is more accurate looking and ...


1

The OP is pretty much all correct, except that gamma makes the dark tones brighter, not dimmer. This exists just in the file, not in the eye. The data is always decoded back to original linear BEFORE any eye sees it. Any difference in the eye seeing the original scene, and seeing the reproduced decoded data, is simply an undesired reproduction error. ...


1

You're right; the camera has its own native color space. When a camera is said to use or support sRGB (or Adobe RGB, as many also do), that means that it has native support for transforming its raw sensor data into that color space. When you use an out-of-camera RAW converter, like Lightroom or Darktable, that program needs to know about your individual ...


1

When talking about the extent of a color gamut, all that's really talking about is the most highly saturated bright colours it can portray, which is only one small aspect of colour accuracy. It says nothing, for example, about the monitor's accuracy in displaying whites and greys, its accuracy in gamma and its ability to portray skin tones, and other mild ...


1

I attempted to duplicate what you are describing. I created an image consisting of the color you specified. I had to guess at how much saturation you were adding in the adjustment. In Lightroom (Develop>Basic>Color>Presence>Saturation) I added 100 saturation. (I'm not sure what steps you were going through, but if you specify, this may help get a clearer ...


1

This is just a visualisation. The colours in the diagram do not represent the real colours of the noted wavelengths (what you see is dependent on the capabilities and calibration of your monitor anyway), but are chosen to give you an idea where the different colours rougly lie.


1

Exact blue is exact blue in all color spaces. If you have a specific color in one color space and convert it to a different color space, it's still exactly the same color (provided that the color is actually possible to represent in the new color space). The color code will be different, but it still represents the same color. If you create a very bright ...


1

Ease of print color mixing. When you are using ink based printing, any application of ink darkens a white page, thus making it difficult to get a true sRGB color space in prints without many inks. If you use a dark blue ink, you can't easily produce light shades of blue. By using lighter shades and a black filler, you can mix the amount of darkness you ...


1

As a matter of fact gamma is not necessary these days, especially when working in high bit representations of the image. However that means a complete software rewrite in far too many cases - or the transition is far from seamless (say, familiar curves change the shape completely, as Mr. Blankertz just mentioned).


1

Here's my first draft of an answer- I'll get into more detail as time allows, but I want to give the OP some sort of answers. Comments are more than welcome. The stuff about CRTs does not indeed apply anymore. But there is a very good practical reason to continue to use gamma encoded images. Using gamma encoding make edits like curves look "normal" because ...


1

As Raymond Chen would put it, developers hate to pay taxes. Colour management is a very big tax on Windows. Developers are expected to ask Windows what colour profile to use and then do all the RGB conversions themselves. (And let's not even get started on the added challenges of multiple monitors!) Most developers don't know any better so they just draw ...



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