Mike Chaney's Tech Corner

I cobbled together an image for printing, and in Qimage I noticed that the ICC showed as "opRGB".  The image printed perfectly fine.  But I was curious about the profile.  I couldn't find anything understandable (to me  ;) ) online.  And there is no ICC/ICM with opRGB in the name anywhere on my computer.

By cobbled I mean that there were 4 images from different workflows, laid out in Paint.NET for printing.  All were AdobeRGB 1998, all TIFF but I think maybe one or two were converted from JPEG.  This is a one-off quickie, I realize the workflow is wrong (not normal workflow) and likely contributed to and/or caused the strange ICC profile.

With the image programs I have, it can only be viewed in QU and FastStone; it is either "corrupted" or "unsupported" or similar in Irfanview, Nikon View NXi, Affinity Photo, Olympus Viewer 3, a couple of others.

As I said, the print turned out very nice, it's saved as a job (highly unlikely to ever be re-printed).  I'm simply curious as to what opRGB is and where it came from, and why with my amazing and world-renowned internet searching skills I couldn't find anything helpful. 

There was that close comet fly-by recently...

--George

Google it, George. Tons of information. Just an rgb file from that program you used.
Fred

https://www.google.com/search?source=hp&ei=N_osXO_cG8a6ggfk6KOACA&q=oprgb&btnK=Google+Search&oq=oprgb&gs_l=psy-ab.3..0i10l10.2224.3969..11247...0.0..0.99.515.6......0....1..gws-wiz.....0..0j35i39j0i131.N4oUwSoighY

I did that yesterday, over an hours worth of searching and reading.  Same results as your link (although, now my posting to the Paint.NET forum shows up!).  Nothing to explain where it came from.

My question is:  if there is no opRGB.icc/icm on my computer, why does it show up in Qimage?  (Oops, and my other question.)  And why does the image show up in QU and FastStone, but not in any other apps I have?

--George

It is probably embedded in the image.
When you read the profile on the hotbar, does it have asterisks before and after the name?
Some programs may not accept that color space.
Run a convert in Qimage that will make a new tif or jpg and allow QU to reprofile to the standard RGB. Then it should open in the other programs.
Fred

Magic!  It took me a few seconds to work out how to include the path for opRGB, since (in my mind) it doesn't exist.  I just typed in opRGB without a file path.  The conversion opens up fine in all the other.

The asterisks didn't register in my mind because all of my images, except raw, have starred ICCs.

Thanks, Fred, as always, you came through.  (But if you ever find out where it comes from, let me know!  ;) )

--George

From looking at the specs, it looks like opRGB = Adobe RGB.

Mike

Yes, I found this at color.org relating to opRGB:  "Chromaticity co-ordinates of primaries:  ... Note: these are the same as Adobe RGB (1998). "

But searching for opRGB.icm or .icc doesn't yield anything use.

One of the sources I came across yesterday indicated that AdobeRGB in Nikon NEF files probably didn't play well with various converters/editors.  Which I've heard before (since 2013).  But these images started life as Olympus raw (.ORF), so maybe they have the same problem as Nikon raw files.

On my todo list is to get the ICC to clarify all this.  I'll let y'all know how that turns out.

--George