Hi All,
So I’m trying to create LUTs that will allow me to linearize a projector’s
output so I can use it for fringe-based 3D surface capture.
I’ve already gone the route of creating a full display model (LUTs, matrix,
white, black, …) but I want to try the brain-dead approach of creating a simple
one-to-one grayscale RGB to Y LUT.
To do this I hand-made the attached full_ramps.ti1 file that has 256 RGB
entries between 0-100 (excerpted below in case I can’t post attachments). When
I use this file with dispread, the measurements proceed nicely, but then
intermittently (more often than not) dispread finishes measuring, gives the
message “The instrument can be removed from the screen.” and then hangs, never
writing the .ti3 file.
Can anyone help me understand/fix this?
Thanks in advance,
-Jim Ferwerda
HARDWARE
Macbook Pro, OSX 10.15.3, zsh
Argyll V2.1.2
ColorMunki Photo
Version string: 'colormunki FW V1.32 Build Nr. 1303’
NEC NP-216 DLP projector
COMMAND WINDOW OUTPUT
namarupa: dispread -v -d 2 -c 1 -a -F -P 0.5,0.5,3.0 full_ramps
Number of patches = 256
Setting up the instrument
Instrument Type: ColorMunki
Serial Number: 2070257
Firmware version: 288
Chip ID: 01-1A6CAE160000BE
Version string: 'colormunki FW V1.32 Build Nr. 1303'
Calibration Ver.: 6
Production No.: 118386
Set instrument sensor to calibration position,
and then hit any key to continue,
or hit Esc or Q to abort:
Calibration complete
Place instrument on test window.
Hit Esc or Q to give up, any other key to continue:
Measured display update delay of 47 msec, using delay of 162 msec & 1 msec inst
reaction
patch 256 of 256
The instrument can be removed from the screen.
CLIP OF .ti1 FILE
CTI1
COLOR_REP "RGB"
NUMBER_OF_FIELDS 4
BEGIN_DATA_FORMAT
SAMPLE_ID RGB_R RGB_G RGB_B
END_DATA_FORMAT
NUMBER_OF_SETS 256
BEGIN_DATA
1 0 0 0
2 3.921569e-01 3.921569e-01 3.921569e-01
3 7.843137e-01 7.843137e-01 7.843137e-01
4 1.176471e+00 1.176471e+00 1.176471e+00
5 1.568627e+00 1.568627e+00 1.568627e+00
6 1.960784e+00 1.960784e+00 1.960784e+00
7 2.352941e+00 2.352941e+00 2.352941e+00
8 2.745098e+00 2.745098e+00 2.745098e+00
9 3.137255e+00 3.137255e+00 3.137255e+00
10 3.529412e+00 3.529412e+00 3.529412e+00
…
250 9.764706e+01 9.764706e+01 9.764706e+01
251 9.803922e+01 9.803922e+01 9.803922e+01
252 9.843137e+01 9.843137e+01 9.843137e+01
253 9.882353e+01 9.882353e+01 9.882353e+01
254 9.921569e+01 9.921569e+01 9.921569e+01
255 9.960784e+01 9.960784e+01 9.960784e+01
256 100 100 100
END_DATA
Attachment:
full_ramps.ti1
Description: Binary data
