Image Calibration and MOI

I am trying to create a program that will calculate the moment of inertia of a particular image. I want to be able to prompt the user to select an image, calibrate the image based on real world settings, and calculate the MOI of a particular region. Right now I can import the image, but I cannot calibrate based on user prompted data points. I would like to have the image displayed, the user selects two points on the image, and then enters the real world distance between the points. Any help would be great!
Alex

Hello Alex,
I have a few questions to ask you about your application. You stated that you are able to bring the picture into LabVIEW. How are you doing this? Are you using the IMAQ driver? If you are then there is an example how to calculate the thickness of a ring which my be a good start with trying to implement this. There is also a tutorial about this and how to use the IMAQ driver.
I hope this information helps you with it.
Jim St
National Instruments
RF Product Support Engineer

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Appearance of color in Photoshop after calibration, and outside of Photoshop

I bought an expensive monitor some time ago which claims to produce the color gamut of Adobe RGB, the NEC PA271W. I also bought an X-rite i1 Display Pro colorimeter, with software, to calibrate my monitor.
After calibration, the images appear right when displayed in Photoshop, and such images print okay on my professional printer with professional profiles, but such images don't appear okay outside of Photoshop, when displayed on my calibrated monitor. They appear far too saturated and contrasty.
When I check what profile is listed under the Color Management tab of my monitor, the default profile is the same as that listed among all the other profiles under Windows/system32/spool/drivers/color.
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Any help would be appreciated.

Vincent RJ wrote:
I think we're either talking at cross purposes, or you are misinterpreting my words. I've always understood that the purpose of calibration is to standardise the appearance of the image on all monitors that are correctly calibrated.
You are indeed MASSIVELY WRONG there. Trust me, you're not even close to beginning to understand color management. What you are describing is a simplistic, deficient personal idea of Color Management, not "calibration".
STEP ONE in Color Management:
Calibrating and profiling are only a start of the whole Color Management process. Calibrating and profiling your monitor does nothing, absolutely nothing for the appearance of any image on other monitors. Trust me: ZILCH !
When you leave out the term "profiling" and refer to calibration alone you are talking sheer nonsense. Get yourself into the habit of thinking of both terms together, though they are part of the one starting point in process.
STEP TWO:
Set your saved monitor profile after calibration as your Monitor Profile File only. Never as your Working Space, never as something you ever embed in a file, never as a print or target profile.
Once you have set this profile as your Monitor Profile. You NEVER think of it again, and never mention it again—unless eventually, and for whatever reason, your monitor profile file gets corrupted, damaged or disappears by magic.
Note that your monitor profile is a strictly device-dependent profile, it applies to nothing else in the entire world, only to your video card and your particular monitor unit. Not even to an identical model and manufacturing batch. Each individual monitor has its own performance characteristics (industrial tolerances of components or manufacture and all that, as well as aging of same).
STEP THREE:
This entails choosing your WORKING COLOR SPACE. This will always be a device-independent (repeat: device-independent) standard workspace such as ProPhoto RGB, Adobe RGB, sRGB, etc., in descending degree of gamut width.
STEP FOUR:
You make absolutely sure to embed the device-independent Color Profile of your Working Color Space in your document (image file), this is called tagging your file. This is of such enormous importance that I always say: "If a moron hands you an untagged file, you're going to have to guess in which color space it was created. Once you make your best educated guess, remember to go beat that moron who gave you an untagged file mercilessly with a baseball bat or simlar, heavy object!"
This is just my way of stressing how wrong it is not to embed the color space profile in your finished file. The only worse offense would be to tag it with the wrong profile. Tagging a file with your monitor profile should be punished by quartering or by burning at the stake.
Again, just strong imagery to reinforce the concept.
STEP FIVE:
This will be using a device-dependent Printing Profile, also called a Target Profile, in the printing dialog of the Photoshop application or the RIP used by a commercial printing outfit. This will be a device dependent profile prepared exclusively and specifically for your particular combination of ink, paper and printer.
~~~~~~~~~~~~~~~~~~~~~~~~~~
Vincent RJ wrote:
…I'm not referring to any conversion of numbers or RGB values…
But of course you are Vincent RJ, you are!!! Most definitely you are! Why can't you grasp that basic concept? ?? !!
With a calibrated and profiled monitor and a properly tagged image file (with the color profile of your working color space properly embedded) Photoshop will use your Monitor Profile that you set in the application as such to CONVERT and CHANGE THE NUMBERS (VALUES) of the RGB colors in your finished image BEFORE sending them to your monitor. Every single time. Think of that process as making up for the deficiencies of your monitor and video card combination.
When other people look at your image, if they're using a color managed application, said application will use whatever they have set as their Monitor Profile in their setup to CHANGE THE NUMBERS of the colors in your finished image BEFORE sending them to THEIR monitors.
If their monitors are uncalibrated and unprofiled, you don't have a prayer of a chance to control even remotely how your image will look on their screens. That's 96% of web users, by the way. If their monitors are calibrated and profiled, the image on the screen will be reasonably close to what you see, but the gamut of their monitors (vs. your wide-gamut NEC) will necessarily change the RGB numbers and colors from what your setup does, and the variance will be greater.
Get rid forever of your silly concept of "standardisation" or standardization, whichever way we want to spell it. That is simply a pipe dream of yours. If you have a big stick handy, beat up the moron who got you to believe that. Use twice the numbers of strikes if that person is a teacher.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lastly, I'm getting an uneasy feeling because you haven't mentioned printing at all.
You should be aware that Color Management is defined in terms of the art and science of controlling colors from the digital image to print. There are different variants of the definition, but they all end with the word PRINT.
What I'm trying to say is that a person who works with images only to be observed and shown on screens does not need to bother with Color Management at all, because the minute percentage of monitor viewers I mentioned above. Such a person can just set everything to sRGB (monitor, color space, tags, printer, etc), the lowest common denominator of profiles, and forget about anything else.
I would hope I got through to you, but I'm not holding my breath.
I wish you luck in your endeavo(u)rs.

LR Color Management - Calibration and Monitor (not your typical post)

Hi everybody,
I see that there are still many issues around color management and printing in LR. I have had similar problems in past and Im still trying to work though them. The most touted problem is not calibrating or having a bad monitor profile. Well, I have tried calibrating my display with worse results. I get better results with an un-calibrated display, not exact results, but closer than with a calibrated display. My only computer is a Dell Latitude D830 with an LCD display and Nvidia Quadro 140M graphics card with a Spyder2 Suite calibration tool.
After doing a fair bit of research online and speaking to other photographers (pro and amateur) Ive learned that laptop displays are notoriously difficult to calibrate due to their inability to display a wide range of color and contrast. There is also no way to adjust white point, RGB or any other setting on my display, only brightness and contrast. (perhaps a big part of the problem?)
I was told that only high end displays (NEC, LaCie, Eizo etc @ $1000,00 this being the low end, and up) were the only way to get accurate colors. Others had said that LG and Samsung make a decent display at the $300.00 price point that would deliver good results but not pro level color management. Other than that go, back to an old CRT display. What is a semi-pro level display that renders excellent color that I wont have to re-mortgage my house to pay for?
So heres my question to all of those who have said you need to calibrate and you have a bad profile can you please tell us your system set up (i.e. display, calibration tool, room lighting and set up etc..)?
Im really interested in what you are doing more, better or differently than everyone else.
Thanks,
DC

>Im really interested in what you are doing more, better or differently than everyone else.
Nothing much. Same calibrator in addition to another Huey Pro which gives almost indistinguishable results. I use both a Apple Mac Book Pro and a Mac Pro with a 30" DELL wide gamut adobeRGB display. Colors on the two are identical (if they're not outside of the laptop's gamut) and identical to prints from labs and direct prints. Of course these displays are between far better and quite a bit better than the display on a typical Dell laptop that are notoriously bad. One of the things I have to do on the laptop is to get the display at the right angle. The trick I use is to have a window open with this image: http://www.normankoren.com/monitor_test_txt22.png
from this website: http://www.normankoren.com/makingfineprints1A.html
If you're looking at your monitor at the right angle and you have calibrated the display correctly, the color should look homogeneous (i.e. completely neutral and the same grey everywhere). If you cannot find an angle at which this is correct, than it is likely your monitor can simply not be calibrated or that your calibrator is defective (there was a batch of defective Spyders a while ago). In general, it is certainly not true that laptop displays cannot be calibrated.
>I was told that only high end displays (NEC, LaCie, Eizo etc @ $1000,00 this being the low end, and up) were the only way to get accurate colors. Others had said that LG and Samsung make a decent display at the $300.00 price point that would deliver good results but not pro level color management.
They are quite wrong and a rather snooty thing to say. The point of these high priced displays is that they will give better color in [B]non[/B]-colormanaged applications, but with a good calibrator, a reasonably good screen and [B]correct color management [/B](such as that in Lightroom, Photoshop, preview.app, Safari, etc.) you will get about as good color as the more expensive displays. Some of these, such as the EIZO give you wider gamuts higher bit color, or hardware adjustable white point, which are also a major selling points if you're doing very critical work but only if paired with good calibration and managed apps. Pro level color management is a function of the calibrator and the software - and only in part of the display. Most displays, with a few exceptions, can be made to give good color, as long as you use a hardware calibrator and managed apps.

Why can`t I read image calibration information

Hello! Everyone
I use NI Calibration Training Interface to calibrate my camera, and the calibrated image is attached below. I can use this image to calibrate my other image in NI Vision Assistant, but if I use IMAQ Set Calibration Info.VI or IMAQ Get Calibration Info 2/3, it outputs error -1074396113 （IMAQ Vision: The source/input image has not been calibrated.)
It happens even I use image from NI example - C:\Program Files (x86)\National Instruments\Vision\Examples\Images\Calibration Model Accuracy - Templates\1. Simple Calibration.png
So anyone could help? My dear AE?
CLAD
CAU
Solved!
Go to Solution.
Attachments:
Left Single Calibration Template.png ‏534 KB
read image calibration information error.vi ‏19 KB

I know it！
There are two vi could read image in NI Vision, one is IMAQ ReadFile, another is IMAQ Read Image And Vision Info.
If you want to read calibration information, use the second one!
PS: If your some case happen by chance, check in the Image Name of IMAQ Create vi if there is some Image Name are the same.
ps: Could I choose my own post as a solution?
CLAD
CAU
Attachments:
read image calibration information error.vi ‏18 KB

Image calibration

Hi...can anyone tell me how to go about doing the following image calibration steps done?
I have an image that is grabbed using IMAQ PCI 1424 card using dalsa camera. My image consists of a plain black one with white intensity spots placed at equidistant on the image(something like the one u see in the calibration grid except that the spots here are white and the background is dark).I have to specify a uniform grid around each one of the spot so as to make a selection of the spot). Now for each grid I have to find the centroid. and my final output should be an 2-d array which is the centroid of each of the grids.
How can I go about getting this done?
I use LabVIEW Ver. 6.0 and IMAQ vision 6.0.
Veena..

Hi Veena,
first you have to use the threshold function to get a binary image, this shouldn't be difficult since you have white spots on black surface.
If the result image has only your spots well outlined, you can directly use the IMAQ Find Circles function to get informations of all the circles contained in your image. This returns an array of clusters of circles dimensions, radius and area.
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Good luck,
Alberto

Super-Pink ... monitor calibration and Lightroom?

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I have LabView but I do not have the Calibration and Configuration Palette,and I could not download it, how can I download it or if i cannot,can I work with the NI-DAQ Calibration_1200?

I have read in a tutorial for the board 1200 that I can calibrate it with the Calibration and Configuration Palette in LabVIEW, but I do not have them and I could not download it to access its libraries, so I can only download the NI-DAQ software,What's my best choice and if it is to download the palette with its libraries, how can download it with them?I'd appreciate your answers

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Image Capture and Preview "folder not writable" error importing to shared folder

I'm running 10.8.5 on a Late 2012 model Mac Mini. I'm trying to create a folder under my home directory where my wife can import pictures using Image Capture or Preview while logged into her account. I've tried setting permissions on the folder by setting POSIX permissions and ACLs from the command line, and also by setting ACLs using Get Info in Finder, but it seems as though both Image Capture and Preview ignore the ACLs and instead rely solely on the POSIX permissions for everyone/other (even when a relevant group is set). Unless the POSIX permissions for everyone/other are "rwx" Image Capture and Preview both give an error that the import failed, and /var/log/system.log shows errors that the "folder is not writable". I'd like to be able to set this up without making the folder and the files in it writable by everyone. My understanding was that ACLs should take precedence over POSIX permissions, but even the POSIX permissions don't seem to be getting handled properly, because the group is ignored. Any help or explanation of what's happening would be appreciated.
Here's an example with details:
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"Get Info" shows "Read & Write" for bob and "Read Only" for alice, bob_and_alice, staff, and everyone
We set the following permissions on /Users/bob/importdir:
POSIX: rwxrwxr-x owner=bob, group=bob_and_alice
ACLS: (these are already probably more permissive than should be necessary)
0: group:bob_and_alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
1: user:alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
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Jul 20 22:23:45 computer_name.local Preview[33280]: Document destination folder is not writable
Jul 20 22:23:45 computer_name.local Preview[33280]: Encountered error during image import: Error Domain=com.apple.ImageCaptureCore Code=-9934 "The selected folder is not writable" UserInfo=0x7ffda4881f00 {NSLocalizedDescription=The selected folder is not writable}
Now we change the POSIX permissions on /Users/bob/importdir to: rwxrwxrwx
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Did you figure out how to fix this?

Image Processing and machine vision don't appear in Function Palette

Hi,
I have problem and I can't solve it
Image Processing and machine vision don't appear in Function Palette, Although I set up NI imaq and NI Vision Acquisition Why??
Anyone can help me?
Solved!
Go to Solution.

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Image Capture and Preview have trouble finding the scanner wirelessly unless it is on when the Mac starts up. Photoshop finds the scanner no problem. Any suggestions for Image Capture or Preview?
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I have upgraded to Mountain Lion and have found that some of my software no longer works, notably Image Browser and also the Epson Scanner Perfection 3490 software. Is there a 'patch' or way to allow me to use these programmes especially the scanner.

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Go to Apple menu > System Preferences > Print & Scan and select your scanner from the list--if it's not there you'll need to add it (start with the little plus icon). Once you have it in the list you can click on the Open Scanner button and a pretty barebones scanner driver will load for you. But Image Capture (as mentioned previously), found in your Applications folder, will probably do the job as adequately, or better, than your old scanner software.

Image Calibration and MOI

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