How to code this formula?

Please help me to convert from HSV to RGB with this equation

[Walter Roberson]

Call rgb2hsv()

[Alvin Alvin]

this formula convert from HSV to RGB not rgb2hsv(), can you help me?

i just can code this

C = F.*saturationValue;
Y = mod(hueValue1/60,2)-1;
l = abs(Y);
X = C.*(1-l);
m = F-C;

how can i code (R',G',B')?

[Walter Roberson]

Call hsv2rgb() then.

[Walter Roberson]

Use logical indexing to code the R' G' B' in vectorized form. Or use a for loop with if and elseif

[Alvin Alvin]

Can't do that because the color is not same with original, so in this code i convert the original image from RGB to HSV, then i enhancement the V and store with variable F, and want to make HSV with the Enchancement V which is F to RGB again

and this is the Old Value and NEw Value with Enhancement

[Walter Roberson]

Can't do that

Can't do what ?? Can't use hsv2rgb() ? Can't use logical indexing to code the R' G' B' in vectorized form? Can't use a for loop with if and elseif ?

[Alvin Alvin]

can't use logical indexing to code the R' G' B' in vectorized form and Can't use a for loop with if and elseif too

[Walter Roberson]

Rp = zeros(size(H));
Gp = zeros(size(H));
Bp = zeros(size(H));
for K = 1 : numel(H)
    if H(K) < 60
        Rp(K) = C(K);
        Gp(K) = X(K);
        Bp(K) = 0;
    elseif H(K) < 120
        Rp(K) = X(K);
        Gp(K) = C(K);
        Bp(K) = 0;
    elseif
        and so on
    end
end

What prevents you from using a for loop with if and elseif ?

Answer 1

[Andrei Bobrov]

function rgb = HSVtoRGB(H,S,V)
    n = numel(H);
    C = V.*S;
    X = C .* (1 - abs(mod(H/60,2) - 1));
    A = [C, X, zeros(n,1)];
    i = discretize(H,0:60:360);
    j = perms(1:3);
    j = j([6,4,2,1,3,5],:);
    r = repmat((1:n)',1,3);
    rgbs = A(sub2ind([n,3],r,j(i,:)));
    rgb = 255*(rgbs + V - C);
end