http://imagej.273.s1.nabble.com/is-there-a-way-to-change-the-calibration-bar-value-tp3683507p3683513.html
i really thank u very much Mr.Robert , i'll try it & will see what i'm gonna get
> Date: Sun, 14 Aug 2011 10:37:36 -0700
> From:
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> Subject: Re: is there a way to change the calibration bar value???
> To:
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>
> Jamal,
>
> As far as I know, the process is:
>
> 1. Analyze/Calibrate to input your calibration curve
> 2. Image/Adjust Brightness and Contrast... to select the range of calibrated values to show in the image
> 3. Analyze/Tools/Calibration Bar... to make a new, RGB, image with the calibration bar included
>
> A different approach is to convert your image to 32-bit with Image/Type/32-bit. Then you can use the mathematical transformations to map the pixel values into Relative Dose %. In your case, you would subtract 140 and multiply by 20, so that a pixel value of 140 is mapped to 0 and and pixel value of 145 is mapped to 5 and then 100. Use Process/Math/Subtract.... and then Process/Math/Multiply. After that, you can Adjust Brightness and Contrast and then create the calibration bar.
>
> Bob
>
>
>
>
>
> On Aug 14, 2011, at 10:03 AM, jamal jamal wrote:
>
> > i think may be analyze/ calibrate..... but this option gives u a figure show the linearity or exponential relationship & so on......, so after we get this figure do u think is there a possible way to convert it to calibration bar ????because i have tried but it didn't work with me but sure based on my little experience in Image J
> >
> > Jamal
> >
> >> Date: Sun, 14 Aug 2011 08:13:30 -0700
> >> From:
[hidden email]
> >> Subject: Re: is there a way to change the calibration bar value???
> >> To:
[hidden email]
> >>
> >> Jamal,
> >>
> >> Perhaps Analyze/Calibrate... ?
> >>
> >> Bob
> >>
> >> On Aug 14, 2011, at 4:14 AM, jamal jamal wrote:
> >>
> >>> i really thank you & appreciate your help Mr. Robert, but my problem i face is i want to add my own value to make calibration bar & in case i change the brightness or contrast some information will be lost in the image.
> >>>
> >>> i wanna add these values to make calibration bar, for example:
> >>> Pixel value Relative Dose %
> >>> 145 100
> >>> 144.5 90
> >>> 144 80
> >>> 143.5 70
> >>> 143 60
> >>> 142.5 50
> >>> 142 40
> >>> 141.5 30
> >>> 141 20
> >>> 140.5 10
> >>>
> >>> i measured the Pixel value from Computed Tomography ( CT) Image & i want make calibration bar corresponding to these value.
> >>> as u can see it's linear relationship & i wanna make these value as calibration bar to read other images.
> >>>
> >>>
> >>> please inform me if u have an idea how to solve this problem
> >>>
> >>> i thank u again for response
> >>>
> >>> yours
> >>> Jamal
> >>>
> >
>
> Robert Dougherty, Ph.D.
> President, OptiNav, Inc.
> 1414 127th Place NE #106
> Bellevue, WA 98005
> (425)891-4883
> FAX (425)467-1119
> www.optinav.com
>
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