How to use rgb difference between two colors in C# in order to find the closest match? -


i have code gets closest color based on rgb difference, dark colors dark blue, returns black instead of "dark blue". can u guys me finding out what's happening?

this code calculates rgb difference between 2 colors:

int colordiff(color c1, color c2) {     return (int)math.sqrt((c1.r - c2.r) * (c1.r - c2.r)                         + (c1.g - c2.g) * (c1.g - c2.g)                         + (c1.b - c2.b) * (c1.b - c2.b)); }

this code gets closest color on list (the 1 has less difference between rgb):

int encontrarcor(list<color> colors, color target) {     var colordiffs = colors.select(n => colordiff(n, target)).min(n => n);     return colors.findindex(n => colordiff(n, target) == colordiffs); }

what think happening that, can see in first code, does: (c1.r - c2.r) * (c1.r - c2.r), if 1 of these substrates equal 0, whole product gonna 0, returns black, cause rgb code of black 0,0,0.

i've tried make myself clear possible, sorry if little bit confused.

i don't point of square root , multiplications, differences should positive:

int rgbdiff(color c1, color c2) {     return math.abs(c1.r - c2.r) + math.abs(c1.g - c2.g) + math.abs(c1.b - c2.b); }  color closestcolor(color target, ienumerable<color> colors) {     return colors.min(c => tuple.create(rgbdiff(c, targert), c)).item2; }

note more 1 color can have same difference.


Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more