Tue, 04/16/2019 - 16:06
I tried downloading 3 images this morning into VPhot.
The "Available Images" page shows that the images are okay.
When I click on an image I get a black image.
I am attaching the 3 screen shots.
The last image is one of the .fit images I submitted to VPhot.
I tried loading the 3 .fit files and the 3 zipped .fit files and I get the same black image.
File Upload
Erik:
Is this the first time you have used astroart for imaging and uploading to VPhot? Sometimes the stretch is done unusually and the black/white levels are not as expected by VPhot and you get a black image.
BTW, the last attachment is a gif file not fit file.
Ken
Ken,
Thanks for input.
I always use Astroart for imaging and uploading to VPhot.
This is the first time this has happened, The last attachment is indeed a snapshot of the .fit file.
Hi Erik:
Certainly will be interesting to see what happens to your next group of images. I can see images currently in my image list today with no issues. I have seen this happen on a few rare occasions but never came to a final conclusion of the cause.
Any small changes to your procedure that might be a clue? I suspect not?
Can you share the images to me at MZK?
Ken
Ken,
I have shared the three images with you.
Thank you
Erik
Erik:
As I suspected it appears to be the avisumin and avisumax headers that astroart puts into the image. It has to do with "visualization" / white/black levels?? Do a google search. Look in the headers for the three images you shared. One of them is different and I can see the stars for it. Not sure the headers can be changed without a fits header changer program?
Ken
Thanks Ken
Will check this out
Erik