How can I detect 0.5 percent brightest pixels in an image?

I have a grayscale image.I need to find the 0.5 percent brightest pixels in that image. But my image contain differet object. I want to find the 0.5 percent brightest pixels in an for each object.

Could you help me ?

[Adam]

brightnessVal = prctile( img, 99.5 );
brightestPixels = img >= brightnessVal;

should give you a mask of the brightest pixels in a given greyscale image. How you take your original image and define objects from it to create individual img arguments for this is an entirely different question to the one in the title though and plenty more complicated.

[lifeofengineer]

Actually yes you are right about my question is complicated.

[L, num] = bwlabel(B);

for k = 1 : num

imarray{k} = ismember(L, k);

imarray{k}=imarray{k}.*(ResimOrjinal(:,:,1));

figure

imshow(imarray{k}, []);

end

with this code i am showing my single object from the image. And i want to calculate this each single object's 0.5 percent brightest pixels and showing them on the screen