Specifying a percentage of black in a greyscale image

Hi, I can't figure this out even though it seems like a fairly simple task to want to achieve.
I have a greyscale image and I want to create a colour fill layer that has a particular percentage of black in it (let's say 72%)
If I type C0 M0 Y0 K72 in the solid colour dialog box, when I hover over the image with my eyedropper tool the info palette tells me there is 67% ink down. If I hit okay and go back into the adjustment layer, the fill colour has been converted to C60 M51 Y47 K17. I thought trying to choose a HSB value of H0 S0 B72 might work but the same kind of conversion still occurs.
I've tried changing my document colour space from dot gain 20% to something else but I still can't choose a K value without it converting it to something else. I created a custom dot gain profile with no curve and it still converts it.
Any ideas?
I know I could setup a CMYK profile and specify a black value easily but I want my file to be greyscale so I can assign it various colours in Illustrator. I also want to create grey gradients in the file rather than just a flat fill colour, I'm just using a flat colour in this example because it's easier to explain.
Cheers.

To reproduce the problem, all you need to do is:
Create a new file where the colour mode is greyscale and the colour profile is generic grey profile.
Go to fill under the edit menu, under contents choose "colour...". Enter C 0%, Y 0%, M 0%, K 72%. Hit OK.
Checking the colour that has been put down, the info palette will tell you that there is 65%K ink down, not 72% like I want it to be.
So it does it even if it's not an adjustment layer.
Cheers, Darren

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Finding center in black part of greyscale image

Hi all,
Basically what I want to do is find the center of a black part of a gray scale image. I'm having a bit of a problem using built-in LV functions, because the part of the image is somewhat spherical but not completely.
What I'm doing is imaging drops (I attached an example one to the post), and the drops show up as mostly black (except for the center) due to a bright blacklight. I am currently calculating the size of the drop by converting the image to an array of 1/0s where the 1s represent the region of the drop (and sometimes the edge of the image, depending on the exposure), I then scan each column of the array to calculate the diameter of the drop at that column by subtracting the first and last 1 that I find, then summing over the entirety of the drop and converting that into voxels then microliters. Phew.
So now, what I'm trying to do, is find the center of the drop in x and y. I was thinking I'd be able to use some sort of average of the first/last numbers of each column (and then of each row) but everything I tried didn't seem to make sense and I can't figure out if my method is bad, or my implementation in LV was bad. Any ideas on what I could do here? I attached the code I'm using currently to take the pictures and calculate the drop size, although it may be easier to just start from scratch using the attached image.
I appreciate any advice! Hopefully I explained that well enough, but I know it's a bit confusing.
Laura
Attachments:
Manta camera - FINAL - JMcH with our camera with file save.vi ‏63 KB
water drop, disp 3, exp 300.png ‏420 KB

Hi (again) Burrito,
I started out trying to use the Vision functions, but since my image isn't necessarily a circle nor does it have any straight edges I was having a hard time trying to figure out the best way to use the functions. Someone else I discussed the code with though also recommended making more use of the vision functions if possible - I'll look more into the particle analysis VI. Thanks for the advice!
Laura

How do I paint accurate grey levels between 0-254 in an alpha or a greyscale image? Seems impossible ... Works in 5.5 .. not in CC. Bug?

So here's the thing . I need to be able to assign accurate shades of grey in an alpha channel as our code takes the value (between 0-244) and uses it to do its thing. I assumed this would be easy .. just choose your colour and paint .. but not so.
In an alpha channel, or even in a greyscale image, make a selection and fill it with RGB 6,6,6. Since there doesn't seem to be a way to get a greyscale pallette or input the value for Alpha this is th eonly way I can see to do it.
Now, using the info panel, check that it is indeed RGB 6,6,6. It is.
Now, make another selection and fill it with RGB 7,7,7. Check this with the info panel and ... its 6,6,6.
OK so now use levels or brightness to try to shift that 6,6,6 upto 7,7,7 ... check it with the eyedropper color sampler tool .
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If you do the above in any of the RGB channels themselves it will work fine .. its just the Alpha and in a greyscale image.
On a similar vein, on a regular layer, fill an area with you RGB 7,7,7, copy it and paste it into your alpha. Looks fine .. until you use levels to increase the contrast and you'll find that what was 7,7,7 is now a noise filled mixture of, I assume, 6,6,6 and 8,8,8.
( NB. As a note the above also happened in CS5 but in an old version of Photoshop 5.5 it works perfectly .. I can give the RGB 7,7,7 and the value thats painted is 7,7,7. Bring it into CC and its fine. So its just the creation of tones in CC that is wrong.
Also, it works fine if you edit the individual RGB channels .. you can get 6,6,6 AND 7,7,7 .. but as soon as you copy and paste it into the alpha . .the 7,7,7 reverts to 6,6,6 )
So
Q1 .. what am I doing wrong?
Q2 .. if 8bit alphas and greyscale images can have values ranging from 0-254 .. then how do I define the value I actually want? I can't use the K value as that's only a percentage so has fewer increments and there isn't a separate input for alpha value.
Q3 .. or put it more simply .. how do I set the grey value to a particular number, eg. 7
Thanks.
Pat
Message was edited by: Patrick Ward

Thanks Herbert. I'll have a good look at Photoline.
I don't know if these have anything to do with it but
the first is the color settings from CS5,
the second is the default from a demo install of CC14. I see the gamma tickbox but it doesn't refer to the alpha.
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Greyscale image not displaying properly.

This is my first post here, so greetings!
I am working in LabView 11, and all updates are current.
I am trying to display a greyscale image with five shades varying from black to white. (The shade corresponds to a voltage, this is used to control a piece of optical equipment.)
The image is incorrectly displaying only the black shade and the next shade up (on an 8-bit color scale, it is showing only 0 and 63). I am using "draw unflattened pixmap", and I'm passing to it a 2D array of 8-bit numbers (0, 63, 127, 191, 255) and a Greyscal color table that I created. Each value in the 2-D array that is 63 or greater is drawn on the picture as a shade of 63. I've checked to make sure that the input array does have values that range up to 255.
The mysterious part is that I am using the exact same process in another step of my VI, and it is working perfectly. Same color table, same type of array, and I'm doing it several hundred times in a loop. It has never failed even once to produce the correct image.
I've attached my code, and two of the sub-VI's that I call from it. The main code is "Adaptive Optics Experiment". You won't be able to run it, as it requires a software development kit for a company called Andor for some of the sub-VI's, but maybe just by looking you can detect an issue. I've noted on the block diagram where the problem occurs, and where the same process seems to work fine. It's in the large stacked sequence structure; the working part is in frame 1, non-working in frame 2.
I've also attached an image of the final picture that shows only two shades.
Any suggestions would be greatly appreciated!
Attachments:
Adaptive Optics Experiment.vi ‏88 KB
OptimumPhase.vi ‏14 KB
BuildPhaseMap.vi ‏18 KB

Hi mjpur,
Suggestion: Please check this link for better coding in LabVIEW
http://www.ni.com/newsletter/51735/en/
-Coming to problem:you said in sequence:1 it is working and it's not in 2nd sequence and you mentioned the color tables are also same.
-Now the only terminal looks connected is with data terminal which is coming from BuildPhaseMap.vi
-Please check if the data coming from Build Phase Map is proper or not.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13

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http://scn.sap.com/thread/1295818
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<p>We welcome your submissions here at spin-off! Got a game you want other people to play? Think some people will get a good laugh at your home video? Have a photo you think some people will get a kick out of? Send it to us HERE and we will review it before posting. Please, put the file in the attachment, as well as any title and description you want in the body.</p>
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<a href="index.html">[home]</a> <a href="gameshome.html">[games]</a> <a href="videoshome.html">[videos]</a> <a href="photoshome.html">[photos]</a><br />
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