Creating empty thumbnails

[michaelm]

We are creating an image from an ROI and then generating a thumbnail from that new image. About half the time the thumbnail is blank. Could this be related to the size of the new (ROI) image? Is there an error log I can take a look at? I've attached an example of a bad thumbnail.

[wmoore]

Hi,

Where are you viewing this thumbnail? In Insight or web client?
This doesn't look like
Depending on the failure, you might see errors in client or server logs.

Insight logs are in your user home directory on your client machine, E.g. /Users/wmoore/omero/log/omeroinsight.log.
You can find this in the Insight client under Help > Show Log File.

In web, you'll have to look in the server under var/log/OMEROweb.log.
Server logs themselves are in var/log/Blitz-0.log.

Do you see thumbnail failure correlating with image size in any way?
It's possible that if it's a very long thin image that in resizing to be a thumbnail (longest side 96)
that it is effectively zero pixels high/wide?

Will.

[michaelm]

We set aside some time to get you some more info and realized that the web thumbnail generator worked every time. The problem was in the Insight app.

So in the interest of getting some work done the tech used that.

Her ROIs were always square (she used the rectangle option) and between 2000 and 3000 pixels wide.

[jburel]

Thanks for spending narrowing down the problem
We will investigate the issue

Cheers
Jmarie