ImageDialog fails to show uint32 numpy images

[coutinhotiago]

Hello,
I am using a numpy.ndarray with dtype=uint32 as data source to the
image dialog.
I only get an empty widget.
I works fine with uint16 and float.

I have guidata 1.3.1 and guiqwt 2.1.3

here is the code I used:

#!/usr/bin/env python

import sys
import numpy

from guiqwt.plot import ImageDialog
from guiqwt.builder import make

from PyQt4 import Qt

app = Qt.QApplication([])
args = app.get_command_line_args()
image = numpy.arange(10000, dtype=numpy.uint32).reshape((100,100)) #
if I use uint16 here it works
image_item = make.image(image)
w = ImageDialog(edit=False, toolbar=True)
plot = w.get_plot()
plot.add_item(image_item)
w.show()

sys.exit(app.exec_())


thanks

[Ludovic Aubry]

Hi,

For now, uint32 is reserved for rgba images in the main scaler
routine.

int32 will work but you'll need to shift your pixels' values with
something like
(image - 2**31).astype(np.int32)

Post by coutinhotiago
Hello,
I am using a numpy.ndarray with dtype=uint32 as data source to the
image dialog.
I only get an empty widget.
I works fine with uint16 and float.
I have guidata 1.3.1 and guiqwt 2.1.3
#!/usr/bin/env python
import sys
import numpy
from guiqwt.plot import ImageDialog
from guiqwt.builder import make
from PyQt4 import Qt
app = Qt.QApplication([])
args = app.get_command_line_args()
image = numpy.arange(10000, dtype=numpy.uint32).reshape((100,100)) #
if I use uint16 here it works
image_item = make.image(image)
w = ImageDialog(edit=False, toolbar=True)
plot = w.get_plot()
plot.add_item(image_item)
w.show()
sys.exit(app.exec_())
thanks