I Dare You!

by peter_budo

submit your photo

Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

Tag Info

Hot answers tagged


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 ...


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 ...


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 ...


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, ...


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.


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 ...


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 ...


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 ...


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 ...


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).


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 ...

Only top voted, non community-wiki answers of a minimum length are eligible