Ticket #1423 (closed defect: fixed)
Opened 2012-08-17T15:26:27-05:00
Last modified 2012-08-20T15:57:41-05:00
Unsigned 32-bit images don't survive IJ2->IJ1->IJ2 round trip
| Reported by: | aivar | Owned by: | bdezonia |
|---|---|---|---|
| Priority: | minor | Milestone: |
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| Component: | Core | Version: | |
| Severity: | serious | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | #1420 |
Description
Create a test ramp image (File\New\Image) with unsigned 32-bit, the image looks fine with a grayscale ramp, but if you apply a LUT (Image/Lookup Tables/Fire) the LUT range is distorted.
(This is the third screen capture in luts.png, attached to parent ticket 1420.)
The initial range of values for the ramp image is 0.0...4.294E9, from top left to lower right corner. After you apply a LUT the range becomes 0.0...2.145E9. With the probe tool you can see values in the black area on the right are all 0. The left side of the image shows half of a proper ramp.