For macros I often find it is useful to keep the contrast scaling and channel colors in variables (usually an array of # channels) to reapply after processing or remerging.
Cheers-
Michael C
-----Original Message-----
From: Stein Rørvik <
[hidden email]>
Sent: Friday, January 11, 2019 5:41 AM
To:
[hidden email]
Subject: Conversion to 32-bit resets the contrast range
Here is another issue related to min/max values:
If you convert an 8-bit or 16-bit image to 32-bit, the contrast range is changed, so that the current min/max values are lost.
In the below demo macro we see that the T1 Head image (which is not density calibrated) is reset to a min,max range of 0,230 which seems to be a bit arbitrary.
The CT image (which is density calibrated) is reset to the min/max values of the image.
I see no reason not to preserve the min/max values in these cases, as the dynamic range of the image is always preserved when converting to higher bit depths.
------------------------------
print("\\Clear");
run("T1 Head (2.4M, 16-bits)");
setSlice(nSlices/2);
getMinAndMax(min, max);
print(min, max);
run("32-bit");
getMinAndMax(min, max);
print(min, max);
run("CT (420K, 16-bit DICOM)");
getMinAndMax(min, max);
print(min, max);
run("32-bit");
getMinAndMax(min, max);
print(min, max);
------------------------------
I am using daily build ImageJ 1.52k with Java 1.6 on Windows 7/64-bit.
Stein
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