Incense

by Bart Arondson

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216 reputation
27
bio website
location Czech Republic
age
visits member for 3 years, 11 months
seen Oct 31 at 12:03

Sep
25
comment How practical is shooting in lowlight without a viewfinder?
Sorry for maybe a stupid question, but why is the EVF different from resultant photo? Shouldn't the tiny display in EVF show the same A, S, ISO as on the resultant photo?
May
26
comment Human perception in color mixing
One other thing, just for the record of the question. I get the (186, 186, 186) by using gamma companding with gamma 2.2 and color (188, 188, 188) when using the proper (non-simplified) sRGB transformation. For more info, see: brucelindbloom.com/index.html?Eqn_XYZ_to_RGB.html (I am refering to implementation note number 5 there)
May
26
comment Human perception in color mixing
That is a very good idea. I know the Lab space in Photoshop. I don't have it currently installed, but it would be interesting to do some experiments. I assume that the Normal blend mode would do a simple average though, to be consistent. But there are many other blend modes, which might give interesting results. So far from what I have read, the most accurate is to blend in RGB with adjusted gamma, as JukkaSuomela suggested in comments of my question. This option seems to be available in Photoshop too through some hidden advacend setting.
May
26
comment Human perception in color mixing
I mean more the research in the area of models for mixing colors in CIE color spaces, not just their individual representation in color spaces. I know about the work of CIE in the field of color spaces, conversions, chromatic adaptation, color difference formulas etc.
May
26
comment Human perception in color mixing
Very nice answer, thank you. The averaging algorithm for scaling when using LAB color space is not enough, as you said. The resulting colour from sRGB yellow and blue is a bit blueish grey. My question is: Was there some research in this area or is it still unexplored area?
May
26
comment Human perception in color mixing
@JukkaSuomela: Great information, thanks. My old laptop screen is really bad, so it is not a surprise. What software did you use to do the gamma-aware scaling?
May
25
comment Human perception in color mixing
@JukkaSuomela: Interesting observation. Since both the yellow and blue have only maxed out primaries, the gamma correction of those will not make any change. For other colors the gamma correction would make difference of course. If I make the resulting grey (128, 128, 128) non-linear (for sRGB), I get (188, 188, 188) by applying sRGB gamma companding function. Is this the 50% grey you meant? What linear color space would you use?