I have now read that thread and a couple of others. So I have ordered 6 of these Yuji bulbs
https://store.yujiintl.com/collections/bc-series/products/bc-series-a60-high-cri-remote-phosphor-led-bulb-unit-2-pcsBy these, I hope to lit my room with 5000K to a brightness level of about 300 lux or so, which I then will use as my standard surround and viewing condition.
But I am very confused by a controversy between Andrew Rodney and Frans Waterlander.
http://forum.luminous-landscape.com/index.php?topic=113411.0 Andrews take is, that editing on a monitor in a dark surround will NOT make your prints look too dark.
GWGill (Argyll) replies to Waterlander, who claims the opposite:
"That's certainly consistent with expected color appearance phenomena - specifically the Stevens Effect and Bartleson-Breneman Equations. (See Mark Fairchild's book, "Color Appearance Models", chapters 6.7 and 6.9).
And Andrew replies:
"I've got that book, the equations are out of my pay grade. But I do see this specifically on page 140: The Stevens effect indicates that as luminance levels *increase*, dark colors will appear darker and light colors will appear lighter. The Stevens effect can be demonstrated by viewing an image at high and low luminance levels.(Andrew Rodney:this image is or isn't an emissive display?) A B&W image is particularly effective for this demonstration. (Andrew Rodney: Fran's used the wrong kind of image to test). At low luminance levels (Andrew Rodney:undefined), the image will appear to have a rather low contrast (Andrew Rodney: Contrast or perceived brightness?). White areas will not appear very bright and, perhaps surprisingly, dark areas will not appear very dark. If the image is moved to a significantly higher level of illumination, white areas appear substantially brighter and dark areas appear darker.
Nowhere do I see anything that states or suggests editing images on an emissive display in a dim environment *produces images or prints that are too dark*."
I don't have Fairchilds book, just this PDF:
http://www.cis.rit.edu/fairchild/PDFs/AppearanceLec.pdf,
and from this I can not see it, but dare I suspect that the quote in Andrews reply refers to a reflection print? Then it would make sense to me. But for the monitor image??
While I can see that a dark environment will be the best for judging colors on the monitor, I fail to see the same for tonal edits. In fact, what made me start this topic, was a felt need for a standard brightness in my room for editing, based on experience like this:
For an image I edited in my room while it was dark, I was happy with this tone response curve: 1-TRC in dark. Next day, when I looked at it when the room was lit by dim day light, the image looked dull to me, and I changed the tone curve to: 2-TRC in light. I don't print myself, rely on a print service, but image 1 WILL print darker/less contrasty than image 2, will it not?
I am aware of that this topic has been the object of an extended quarrel already, but I just don't understand what I am missing.