Grayscale Intensity chart and Logarithmic Z axis

[ceties]

Hi, I have following problem. I have some data I want to visualize in Grayscale Intensity Chart. But I want to have the Z scale logarithmic to highlight higher values that are more important for me. But for some reason changing the Z scale doesn't affect the Intensity Chart picture. It just changes the Z scale colorscale. What am I doing wrong?

Use the Load_test.vi to load Envelope_20.txt

Thank for any advices.

[SteelStonehenge]

Have you tried using ARBITRARY scale?  If you set individual markers you can create your own log scale.  Also try interpolation on or off.

Eric

[johnsold]

I cannot answer your question as to why it works as it does. I tried several things without much more success than you seem to be having.

One thing which seems to work is to calculate the logarithm of the data and feed it to an linear scale Intensity graph. See attached modification of your VI.

Lynn

[Charlie S.]

Hello all,

This was reported to R&D (# 30P7MIE9) for further investigation. I apologize for the inconvenience, but I like johnsold's recommendation/workaround. Thanks for the feedback!

[ceties]

Hi all. I just wanted to say that almost 2 years since I encountered this bug and two versions of LabVIEW later this bug is still not solved - I would expect NI to be more flexible. My question is if there is somewhere some complete list of bugs where would be written the name and description of the bug plus status of it. Thanks

[Sorooshster]

Hi Ceties,

With every LabVIEW release there are a group of readme files that are also released.  Those readme's include a list of known issues and bug fixes.  For a particular release you can search on www.ni.com for LabVIEW X.X.X and you should find the readme's.  For LabVIEW 8.5.1, you can go to this link and from there see the bug fixes readme and the known issues readme.  Sorry for the inconvenience, we do our best to fix bugs in a timely manor. 

[Herbert]

And two and a half year later (and a next LabVIEW version (8.6)), the bug is still there.

Probabely we just have to live with it.

[ceties]

It's not the only one, trust me 😞 Actually the Intensity charts are quite buggy.