Color luminance - anyone know about this?

I've got a few questions about color luminence / perceived brightness (or whatever you want to call it - the attribute that encounters that we percieve yellow hue brighter than blue for example)
Firstly,  is there a tool / program / color sistem that enables you to get colors of the same luminance?
Say  I pick a color - determine RGB values - and the program gives me all  the colors around the color wheel with the same luminance but different  hues?
And secondly, which algorithm is used to determine color luminence on this website:
http://www.workwithcolor.com/color-luminance-2233.htm
It looks like, they used none of the following algorithms usually used to calculate luminance:
(0.2126*R) + (0.7152*G) + (0.0722*B)
(0.299*R + 0.587*G + 0.114*B)
sqrt( 0.241*R^2 + 0.691*G^2 + 0.068*B^2 )

Hi
I assume that you're looking for selecting colors with the same L from HSL color mode (hue-saturation-luminance). You can find this in photoshop after selecting colors with eyedropper, and viewing color picker, but this is manual and tedious work. I don't know any tool or function in photoshop that selects color based on luminance channel. I don't think that such tool exist anyway in any photo editing software.
Or - you can try magic wand tool with tolerance set to 1 and allow it to select all pixels with that lightness on layer. This should work somehow...

Similar Messages

  • In app purchase is not working in testing environment in sandbox for the past 5 days. Please anyone know about this issue.

    in app purchase is not working in testing environment in sandbox for the past 5 days. Please anyone know about this issue.
    What i did
      1 . Added three products more to the existing in-app
      2 . Tested with sanbox
    i am getting the error "cannot connect to itunes store" with error code "0" when trying to purchase product in sandbox.
    Is sandbox is down?Please help guys..

    Apple's sandbox has been down practically all month. You can check the status here:
    http://sandbox.itunes.apple.com

  • Mac Book Air sleeps when moved...i don't know whats the problem...please help me out if anyone knows about this...

    Mac Book Air sleeps when moved...i don't know whats the problem...please help me out if anyone knows about this...

    your reed switch for the monitor is defective, it thinks youve shut the lid when you havent
    mechanical fault , contact Apple for service and parts replacement.

  • Hello i just got a suspect sms telling me that a have won a prize from apple and have to go to hhp://apple.ni.rc9.cc/?p=01131641739832 and fill in a code to win a prize is this a scam? Or does anyone know about this?

    Hello i just got a suspect sms telling me that a have won a prize from apple and have to go to hhp://apple.ni.rc9.cc/?p=01131641739832 and fill in a code to win a prize is this a scam? Or does anyone know about this?

    How to delete text messages from the iPhone | How To - CNET

  • My i pod has show me the following directive: Μ27 diagnostics 0.7 completed and the screen is flashing did anyone know about this problem

    My ipod from the beggining of the day was show me that it has a problem with  the  battery ,after this is show me  on the screen the folowing directive
    M27.Diagnostics 0.7 Completed.
    Did anybody know about this  please  I need help.

    Somehow the iPod started the Assorized test and it is completed. Most likely due to a bad and dying battery which need to be replaced.
    To get out of the screen, Just Reset the iPod - Press Menu and Center Button for about 10 secs till the Apple logo comes ON.
    The diagnostic might trigger again, until you get  the iPod overhauled by Apple or 3rd party vendors.

  • I received an error message from the hardware test (4SNS/1/40000000:TCOP-85.875). Anyone know about this?

    I received an error message from the hardware test (4SNS/1/40000000:TCOP-85.875) Anyone know anything about this? Problem is that discs will not load.

    Reset PRAM and do the hardware test.
    Reset PRAM.   http://support.apple.com/kb/PH18761
    Contact Apple.
    Genius Bar reservation
    http://www.apple.com/retail/geniusbar/
    Best.

  • ATI Radeon X1900 Version 2?  Anyone know about this?

    Well, my ATI Radeon X1900 is burning out and keeps crapping out. After Apple looked at it, they decided to give me a new card. It's a Do It Yourself, so they're sending me a replacement card and I send my old one back.
    However, they said they're sending me a newer version, Ver. 2 as is stated in the e-mail, and he said the card's the same with some changes. But he didn't state what the changes were.
    Anyone know what version 2.0 does differently? Is it just more efficient? What're the changes? I can't find anything on this, so I thought I'd ask here.

    Had there been a ROM revision it would have been made available to "rev A" cards via Software Update.
    Apple has not, to my knowledge at least, ever supplied a ROM update for the ATi X1900 XT. Up until now all updates have been supplied via software (the driver) which does not affect hardware and hence, ROM version will be unchanged.
    Additionally, anything that involves flashing firmware will always be delivered as a standalone updater and not as a standard updater. It'll have the same process as our MP's firmware updates due to the higher chance of failure. As far as I know none of these has passed our way.
    any significant hardware been changed on the card other than the cooler, there would be multiple KB docs on it.
    Any documentation that would accompany a revision update would rarely, if ever, be a KB document but part of the developer hardware notes, if even then. Apple's hardware updates and revision changes which do not result on a model change normally pass without any documentation at all.

  • E-panel (for e17) anyone knows about this?

    Hi!
    I have signed up for the mailinglists over @ get-e.org (and the other sites)
    and now there are floating a lot of ideas regarding a e-panel.
    This e-panel should work in a similar way like the gnome-panel / perl-panel and so on...
    I really want a e-panel that could capture my running programs in the taskbar, so far, I haven't been able to set up either pypanel/perlpanel nor gnome-panel to capture running programs in E17, so this is a reason for me wanting to have something like an e-panel
    If i could program this myself, i would have, although, I can not pogram very well, (i am learning gtk for the moment) and I have no idea how to code for e17...
    anyone else willing to be part of this? and try and make a e-panel?

    Personally, I'm not sure that it would be a good idea at the moment. It would probably require updating pretty often as the codebase changed. The way something like pypanel works is window managers broadcast information about the windows they are managing. The panel picks these up and displays them accordingly. Most window managers conform to one standard or another and this is how the various panels (and pagers) know what to do. The fact that no existing panels work with E17 is a bit of a giveaway that it doesn't conform to any standards as of yet. I believe on completion it will conform to the EWMH standards and at that time, most standard panels will work fine.
    Now I could be wrong on some of that, I just chucked it together based on stuff I have heard here and there and guessed out the gaps..

  • Does anyone else have a glitch? When I click on the top button then slide it, I notice a flash on the screen before the main page shows up. Anyone know about this or seen it?

    I have an Iphone4 from verizon.  This is my 2nd and still has the same problem I am trying to figure out.  To turn on the phone, I press the top button, and then I slide to unlock the phone, i notice a flash before it gets to the main screen. Its a little irritating and it only does it every so often.  I dont know anyone else that has this problem.  I took it to the apple store and they said it may be in between updates.  So they gave me a brand new one for free. At first they said it was because I had a screen protector on the front but that wasnt it, so it remains a mystery. Any ideas?

    When you say turn on the phone, do you mean just unlocking the phone to get to your home screen ( icons)?

  • My I Pod touch....after charging it...asked me for a pass code..I have owned it for 4 years now...I have never set up a Password to turn it on...suddenly It is asking me for one...does anyone know about this problem?...now It is disabled...please help

    Cannot open my Ipod touch...never set it up to open with a password...suddenly it is asking for one...Now it is disabled,can anyone help...??

    iOS: Wrong passcode results in red disabled screen: http://support.apple.com/kb/HT1212
    If you cannot remember the passcode, you will need to restore your device using the computer with which you last synced it. This allows you to reset your passcode and resync the data from the device (or restore from a backup). If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present. Refer to Updating and restoring iPhone, iPad and iPod touch software.
    iOS: Unable to update or restore

  • Anyone know about this errors on yahoo mail?

    The requested URL /neo/launch was not found on this server.
    Apache/2.2.9 (Debian) PHP/5.2.6-1+lenny9 with Suhosin-Patch Server at us.mg5.mail.yahoo.com Port 80
    Note: This error is only presents in firefox browser and opening correctly in IE. This Error is present in one pc and on another computer it is working in firefox also.

    is a solution for this in anyone's knowledge as of now?

  • HELP! I've accidentally downloaded "crap" called genieo  i can't remove it, anyone know about this?

    Please Help! I've accidentally downloaded a program called Genieo its taken over my Google Search page. I cannot remove it or change the settings! Everytime I try to search I get taken to this junk.

    If you have genieo (installmac) adware ,
    carefully read this :
    Genieo :The product is a fraud, and the developer knowingly distributes an uninstaller that doesn't work.
    or
    Adware Removal Guide : Genieo

  • Anyone know about this? "The iTunes Lirbrary file cannot be saved. -54 error message

    I lost a drive, but had a back-up, so I started with the new drive, formatted Mac Journaled, copied the songs and iTunes Library over and got everything working (I think). Now I'm getting this message and I'm not sure what to do: The iTunes Library file cannot be saved. Unknown error occurrec (-54). Anyone???
    Thanks in advance.
    Randy

    Hello, Randy. 
    Thank you for visiting Apple Support Communities. 
    This sounds like a permission issue with your iTunes Library folder.  Here are a couple articles that will help you troubleshoot this issue. 
    iTunes: Missing folder or incorrect permissions may prevent authorization
    http://support.apple.com/kb/ts1277
    Troubleshooting permissions issues in Mac OS X
    http://support.apple.com/kb/HT2963
    Cheers,
    Jason H. 

  • Does anyone know about this user interface?

    I just came across a few videos on Youtube showing a kind of LabVIEW user interface. I think there should exist a sort of template project for this, because I have seen more than one person using this. Does any one know where can I find it?

    It sure would have been nice if you posted a link to the youtube video instead of a screen shot of it.
    Since I can't see how it works I will go based on how it looks.  It appears to be a modified version of this GUI inspired by Ubuntu.
    http://forums.ni.com/t5/LabVIEW/GUI-inspired-by-Ub​untu-Netbook-remix/td-p/1155965
    Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
    If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

  • I have the mac book air and when I turn it on its a light blue screen with a flashing folder with a question mark on it and I cant get past it. Anyone know about this?

    I have the mac book air and when I turn it on its a light blue screen with a flashing folder with question mark on it. Any one know how to get past it?

    The MBA is trying to tell you that it is not able to find a bootable system
    Either the file is corrupt or access to the storrage has failed
    I would start by seeing if it will boot with Command + R depressed

Maybe you are looking for