Ticket #1424 (closed defect: fixed)
Opened 2012-08-17T15:29:01-05:00
Last modified 2012-08-20T15:58:01-05:00
Signed 64-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 signed 64-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 last screen capture in luts.png, attached to parent ticket 1420.)
After you apply a LUT the image is not a ramp anymore. Instead it consists of alternating bands of positive and negative values that map to colors 127 and 128.