How do I convert RGB pixel intensity to its grayscale intensity

[Dormidont]

I have to convert RGB pixel intensity to its grayscale intensit. Is it possible to convert it using LV functions?

[Rolf Kalbermatter]

I have to convert RGB pixel intensity to its grayscale intensit. Is it possible to convert it using LV functions?

The most simple solution is to simply add the R, G, and B parts together and divide it by 3. This has however likely the effect of not exactly giving the result you would expect since the human eye sensitivity is different for the different colors. So you would have to weight the different colors accordingly before adding them. I think you will end up with weighting factors around 0.8 .. 1.3 for the different colors, but I haven't the exact information ready here. Looking on internet about color to grayscale conversion should give you the details easily and you may find that there are actually different weighting factors depending on your intended application.

Rolf Kalbermatter

[Yuri]

I have to convert RGB pixel intensity to its grayscale intensit. Is it possible to convert it using LV functions?

try it (вроде работает )

[Grampa_of_Oliva_n_Eden]

try it (вроде работает )

I do not know how "correct" my method is but I'll share it for the sake of conversation.

I deal with the three color components like the like they are vectors in color space.

To get a gey scale representation I take the square root of the sum of the three components squared and then divide by the max possible vector length (sqrt [ 3 X 255^2]).

the result of that value becomes the new R, G, and B values.

Ben

[Yuri]

I do not know how "correct" my method is but I'll share it for the sake of conversation.

I deal with the three color components like the like they are vectors in color space.

To get a gey scale representation I take the square root of the sum of the three components squared and then divide by the max possible vector length (sqrt [ 3 X 255^2]).

the result of that value becomes the new R, G, and B values.

Ben

Grey shade GREY it RGB with components (GREY, GREY, GREY). Therefore the algorithm (formula) for three numbers (R, G, B) and GREY is important. Frequently use (processing of digitalimaging) formulas (http://neuroface.narod.ru/files/mahfoudh_autoref.pdf)

(1) grey=0.3*R+0.59*G+0.11*B

Or

(2) grey = (R+G+B)/3

(if R, G, B, GREY = [0,1])

Results are lower.

0-initial picture

1-calculation under the formula (1)

2-calculation under the formula (2)

(since I lazy my example uses interpolation from labview above )