Ticket #1577 (assigned defect)
Opened 2012-11-21T16:52:17-06:00
Last modified 2013-12-05T15:43:09-06:00
Screen output non-linear
| Reported by: | aivar | Owned by: | curtis |
|---|---|---|---|
| Priority: | major | Milestone: | imagej2-b8-analysis |
| Component: | Display API | Version: | |
| Severity: | serious | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | #1244 |
Description
Load clown.jpg and examine pixel (84, 32) with the DigitalColor Meter utility on OS X.
Actual value of pixel and Probe Tool value is (221, 204, 186). Displayed value is (245, 226, 209).
Change History
comment:2 Changed 2012-11-21T16:55:15-06:00 by aivar
- Owner changed from curtis to aivar
- Status changed from new to assigned
Reassigned to myself, aivar, as this pertains to binning problems when converting a color component value to a LUT bin.
comment:3 Changed 2012-11-21T17:46:39-06:00 by aivar
Printed out some debugging information in net.imglib2.display.AbstractColorTable.lookupARGB():
RED min 0.0 max 255.0 value 241.0 bin 241
GREEN min 0.0 max 255.0 value 160.0 bin 160
BLUE min 0.0 max 234.0 value 42.0 bin 45
RED min 0.0 max 255.0 value 249.0 bin 249
GREEN min 0.0 max 255.0 value 168.0 bin 168
BLUE min 0.0 max 234.0 value 50.0 bin 54
. . .
Did Color/Split Channels and analyzed R, G, B images with IJ2 Histogram Plot (IJ1 Histogram ignores the split channels and deals only with the original!). Indeed the max value for R and G is 255 and for the B component its 234.
This debugging printout shows R & G are correctly linear; B is being autoscaled to the 0..234 range by default, which I believe is an inappropriate distortion. However this does not explain the issue of this ticket: I'm observing all components are too light, not just B.
comment:4 Changed 2012-11-21T17:56:37-06:00 by aivar
Added debugging info in AbstractColorTable.argb():
RED min 0.0 max 255.0 value 241.0 bin 241
argb bin is 241 r 241 g 0 b 0
GREEN min 0.0 max 255.0 value 160.0 bin 160
argb bin is 160 r 0 g 160 b 0
BLUE min 0.0 max 234.0 value 42.0 bin 45
argb bin is 45 r 0 g 0 b 45
RED min 0.0 max 255.0 value 249.0 bin 249
argb bin is 249 r 249 g 0 b 0
GREEN min 0.0 max 255.0 value 168.0 bin 168
argb bin is 168 r 0 g 168 b 0
BLUE min 0.0 max 234.0 value 50.0 bin 54
argb bin is 54 r 0 g 0 b 54
RED min 0.0 max 255.0 value 253.0 bin 253
argb bin is 253 r 253 g 0 b 0
GREEN min 0.0 max 255.0 value 173.0 bin 173
argb bin is 173 r 0 g 173 b 0
BLUE min 0.0 max 234.0 value 52.0 bin 56
argb bin is 56 r 0 g 0 b 56
RED min 0.0 max 255.0 value 249.0 bin 249
argb bin is 249 r 249 g 0 b 0
GREEN min 0.0 max 255.0 value 169.0 bin 169
The R, G, B ramp palettes look good: a red bin of 249 translates to a color (249, 0, 0) as it should.
comment:5 Changed 2013-03-07T15:49:36-06:00 by bdezonia
- Milestone changed from imagej2-b7-ndim-data to imagej2-b8-analysis