Sun 30-Dec-12 11:28 PM | edited Mon 31-Dec-12 01:59 AM by pwarbeck
I'm running CNX2 version 2.2.7 on Windows 7 Home Premium 64-bit.
I'm outputting tiffs from HDR Efex Pro 2 (HEP2) and attempting to load them into CNX2. Sometimes the tiff loads, and sometime CNX2 says "Cannot load file."
Other people have suggested that the problem is the size of the tiff files. However I have not been able to verify this. The problem seems to occur randomly, sometimes with large tiff files and sometimes with small ones.
I unchecked the "align images" and "reduce chromatic aberration" boxes on the HEP2 Merge screen. After doing this, I was able to consistently output readable tiffs. But I suspect this could be a coincidence. Something else is going on.
Bob, Good idea. I upgraded to NX2 2.3.5, which is the latest version. As an experiment, I saved five tiffs from HDR Efex Pro 2. All five are roughly the same size. See what happens when I open the directory in NX2. The files with the blank icons are unreadable.
I have 4GB, but I suspect that's not the problem. To test this, I duplicated each of the five original tiffs, making ten. NX2 can open 6 of them (the same ones as before, as well as their copies). If I duplicate each of the original tiffs twice, I can open 9 of them (see screenshot). Would this happen if there were a memory problem?
Interestingly, copies of the tiffs that won't open also won't open. This seems to implicate the tiffs themselves, rather than NX2.
All tiffs were created identically, using HDR Efex Pro 2. I was able to open the tiffs in Gimp and verify that they do not contain an alpha channel.
It is interesting that if I use Gimp to open one of these tiffs that NX2 cannot read and then write it back out without any changes, the file can then be opened by NX2. Of course Gimp reduces the file from 16-bits to 8-bits per channel, so this is not a solution.
Fri 04-Jan-13 06:34 AM | edited Fri 04-Jan-13 06:41 AM by pshnikchch
>All tiffs were created identically, using HDR Efex Pro 2. I >was able to open the tiffs in Gimp and verify that they do not >contain an alpha channel. > >It is interesting that if I use Gimp to open one of these >tiffs that NX2 cannot read and then write it back out without >any changes, the file can then be opened by NX2. Of course >Gimp reduces the file from 16-bits to 8-bits per channel, so >this is not a solution. >
Ok. The plot thickens.
I wonder if there is a problem with a linear dimension (width or height) of the problem TIFFs. Is there a common factor? I have found that I can load > 1GB TIFFs into CNX providing a certain linear dimension is not exceeded. However looking at your images above I suspect dimensions are unlikely to be the cause.
Regarding correcting the problem TIFFs with Gimp: there is a preview version available of the upcoming 16 bit per channel (and greater) GIMP. From my experience of the preview you may be able to load and save the problem TIFFs, retain the 16 bits per channel and rectify the CNX loading problem.